selection guide dehumidification of swimming pools

SELECTION GUIDE
DEHUMIDIFICATION OF SWIMMING POOLS
Copyright © Dantherm 2016
CONTENTS
Why Should You Dehumidify an Indoor Swimming Pool?
5
Understand the Air
6
Ensure the Chemistry of the Water Is Correct
10
Choose the Correct Materials
11
Two Ways to Control Humidity
12
Which Type of Dehumidifier Should You Choose? 15
Temperature Management
16
How to Determine the Operating Conditions
18
How to Calculate the Humidity Load
20
Selecting the Type of Dehumidifier
25
How to Dimension the Dehumidifier
36
Air Circulation
38
Air Distribution
40
Regulating The Volumes of Air
42
Step by Step – How to Dimension Correctly
43
December 2016
Copyright © Dantherm 2016
Copyright © Dantherm 2016
1
WHY SHOULD YOU
DEHUMIDIFY AN
INDOOR SWIMMING
POOL?
Large volumes of water constantly evaporate from the surface of a pool, and
from the damp tiles around the pool. Several thousand litres of water can
evaporate from a swimming pool in a single day.
Far too many private and public indoor swimming pools have been destroyed
because the inventory, walls and building structures were destroyed by
mould, rot and corrosion – because an adequate dehumidifying system was
never installed. Humidity in itself is critical, and at the same time chlorine is
an aggressive substance, which severely attacks building materials when it is
present in condensation.
In addition to protecting the building, dehumidification is also about people’s
comfort. Excessive humidity will lead to visitors and staff having a bad experience in the swimming pool.
A tool for choosing the correct solution
To deal with these problems, Dantherm has written this Selection Guide for
the dehumidification of swimming pools. The aim of the guide is to provide
engineers and pool fitters with a tool for choosing the correct pool dehumidifier – regardless of whether it is for smaller pools, hotel swimming pools or
public swimming pools.
The dimensioning of a pool dehumidifier is not an exact science, and there are
many mutually dependent factors which have an impact. Making a change in
one area, often affects other areas. Dehumidification requires careful thought
and above all, good dialogue between the architect and consulting engineer.
A good dehumidification solution is an overall solution, and therefore this
guide relates to both dehumidification, temperature regulation and ventilation.
This Selection Guide is based on Dantherm’s extensive expertise and many
years of experience in dehumidifying thousands of indoor swimming pools.
This is why we can say with confidence that you are on safe ground if you
follow the directions in this guide.
5
Copyright © Dantherm 2016
2
UNDERSTAND THE AIR
To understand the processes that happen in the
The highest relative humidity that can be al-
air, you need to think of the air as a mixture of
lowed with a given room temperature is de-
dry air and water vapour.
fined by the insulation grade of the building,
the water content of the air, the outdoor air
We call this mixture, humid air. Air expands
temperature and the air circulation in the room.
when it is warmed and contracts when it is
cooled. When air is warmed up, it can hold
For example, if the air inside a swimming pool
more water vapour and when it cools down, it
is at 28 °C and it has a relative humidity of 60 %,
can hold less water vapour. When the air cools
the air will condense on the wall if the wall’s
down a lot, it reaches the dew point, which
temperature is less than 19.5 °C.
means the air is saturated, and the water vapour
condenses as water.
To be able to explain and understand the physical interplay in the air, we use a Mollier diagram.
The dew point is a crucial term in relation to the
dehumidification of indoor swimming pools.
The terms used in a Mollier diagram are speci-
Humid air will condense on a cold surface when
fied below.
the temperature of the cold surface is below the
dew point.
The air’s density (ρ)
The vertical orange axis all the way out on the left.
The air’s density changes in line with changes to temperature/relative humidity. In general, the air weighs less the higher the relative humidity is.
We use ρ = 1.175 kg/m3 air as the average value of the air’s density indoors
and outdoors.
Air temperature (t)
Dry bulb (t)
The vertical pink axis on the left with corresponding lightly sloping lines.
The temperature we measure in the air using an standard thermometer.
The temperature is given in °C.
Enthalpy (h)
The purple diagonal lines.
Enthalpy is the air’s heat content and is stated as kJ/kg air.
Starts at 0 °C = 0 kJ/kg.
Relative humidity (RH) The green curves.
The relative humidity is stated as a percentage (%) and is an expression of
the air's actual water vapour pressure compared to the water vapour pressure
when the air is saturated.
Water content (x)
The horizontal light blue bottom axis.
The water content describes the amount of water that is actually present in
the air, and is given as g water per kg air.
Water vapour pressure The vertical blue axis on the right.
(p)
The water vapour pressure is measured in mbar and is read to determine the
partial water vapour pressure.
The brown diagonal line in the bottom half of the diagram is an aid to use to
determine the partial water vapour pressure.
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Copyright © Dantherm 2016
Luftens densitet kg/m3
Air density kg/m3
MOLLIER HX-DIAGRAM
1.100
Relative humidity %
Air temperatureoC
0%
Lufttemperatur oC
60
%
20
Relativ fugtighed %
1
30%
55
50
40%
45
50%
60%
40
1.150
70%
80%
90%
%
100
35
30
90
g
/k
kJ
g
/k
kJ
70
60
20
g
/k
kJ
1.200
80
25
g
/k
kJ
50
40
g
/k
kJ
15
kJ
35
g
/k
30
20
5
g
/k
kJ
0
25
10
g
/k
20
-5
15
1.350
-10
10
-15
-20
5
0
5
10
15
20
25
Vanddamptryk (mbar)
kJ
1.300
Water vapour pressure (mbar)
10
30
1.250
g
/k
kJ
40
0
Vandindhold (x) i g vand/kg luft
Water content (x) in g water/kg air
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Copyright © Dantherm 2016
EXAMPLE: HOW TO USE THE MOLLIER DIAGRAM
The Mollier diagram allows you to read the dew point temperature and water content in the air, if you
know the relative humidity of the air and the air’s temperature. The point is plotted in the diagram and
the water content of the air is found on the X-axis. The dew point temperature is found by moving
vertically, until you intersect the 100 %RH curve, after which you read the dew point temperature on
the Y-axis.
At 28 °C; 60 %RH, the water content is approx. 14 g water per kg air, and the dew point temperature
is approx. 19.5 °C. This means that if there are surfaces in the room that have a temperature that is less
than 19.5 °C, condensation will form on these surfaces.
If the building is poorly insulated, it may be necessary to lower the relative humidity to 50 %RH, the
water content will change to 12 g water/kg air and the dew point temperature will change to 16.5 °C.
Luftens densitet kg/m3
Air density kg/m3
MOLLIER HX-DIAGRAM
1.100
Relative humidity %
Air temperatureoC
%
60
%
20
Relativ fugtighed %
10
Lufttemperatur oC
30%
55
50
40%
45
1.150
50%
40
60%
35
80%
90%
%
100
70%
30
90
g
/k
kJ
g
J/k
70
60
20
g
/k
kJ
1.200
k
80
25
g
/k
kJ
50
kJ
15
g
/k
40
40
g
/k
kJ
g
/k
kJ
35
30
20
g
/k
kJ
0
25
k
10
1.300
g
J/k
20
-5
15
1.350
-10
10
-15
-20
5
0
5
10
15
Vandindhold (x) i g vand/kg luft
Water content (x) in g water/kg air
8
Copyright © Dantherm 2016
20
25
0
Vanddamptryk (mbar)
5
Water vapour pressure (mbar)
10
30
1.250
Copyright © Dantherm 2016
3
ENSURE THE CHEMISTRY OF
THE WATER IS CORRECT
The correct combination of chemicals in an
At the same time, the incorrect composition of
indoor swimming pool is crucial, both for the
chemical ingredients in the water can destroy
health of users and for the inventory inside the
all of the inventory in a very short space of time,
pool room and the swimming pool’s technical
including the dehumidifier and other equip-
room.
ment that have been installed to process the air.
Insufficiently treated water results in poor hy-
Shown below are the threshold values, which
giene, while water that has been excessively
apply to products for indoor swimming pools
treated results in gases in the air that contain
in accordance with EN/ISO 12944-2, protection
chlorine, which can irritate the eyes and cause
class C4. These threshold values must be com-
breathing difficulties.
plied with for the warranty to be valid.
WHEN ADDING CHEMICALS
Ingredients
PPM
Free chlorine
1.0 - 2.0
Combined chlorine
Max 1/3 of the free chlorine content
pH
7.2 - 7.6
Total alkalinity
80 - 150
Calcium hardness
250 - 450
Total dissolved solids
< 2,000
Sulphates
< 360
WITH OWN PRODUCTION OF CHLORINE
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Copyright © Dantherm 2016
Ingredients
PPM
Salt (NaCl)
< 30,000
Total dissolved solids
< 5,500
pH
7.2 - 7.6
Total alkalinity
80 - 150
Calcium hardness
250 - 450
Sulphates
< 360
4
CHOOSE THE
CORRECT MATERIALS
The environment in an indoor swimming pool
vanised steel that has been powder coated. The
is aggressive, which means it is very important
heat exchangers should be made of aluminium
that the materials that are used in a dehumidifi-
that is epoxy-protected and coated.
er are corrosion-protected, because the lifetime
of the products will otherwise be very short.
The evaporators and condensers in particular need to have good protection, first with a
Components in comfort ventilation units are
primer using epoxy coating and then with top
not protected in relation to an aggressive envi-
coating. In general, galvanised steel or alumini-
ronment like a swimming pool. This means that
um that is powder coated are the only materials
comfort ventilation cannot be mixed with the
that are suitable for swimming pool environ-
swimming pool ventilation.
ments. Standard stainless steel should not be
used.
The basic material that is used in the dehumidifier for heat exchangers, fans and surfaces, can
Dantherm’s swimming pool dehumidifiers
have different corrosion classes, depending on
are as standard, protected in accordance with
the required lifetime. It is recommended that
EN/ISO 12944-2, protection class C4.
the basic material is aluminium or hot-dip gal-
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Copyright © Dantherm 2016
5
TWO WAYS TO
CONTROL HUMIDITY
door air is good for comfort but warming the
DEHUMIDIFICATION
USING CONDENSE
DEHUMIDIFIERS
new air is expensive in terms of energy con-
For small pools in private homes, in hotels or in
sumption.
spa centres, often a dehumidifier is used, which
In the past, the standard practice was to replace
the air in a swimming pool with new air. Out-
recirculates the air and condenses the water by
Increasing energy prices and increased aware-
using an evaporator coil. This type of dehumidi-
ness of energy consumption has led to great-
fier is called a condense dehumidifier.
er focus on saving energy – and this includes
dehumidification. Therefore today there is focus
What does a condense dehumidifier consist
on recirculating as much air as possible or re-
of?
covering heat in heat exchangers.
A condense dehumidifier consists of a fan, a
cooling unit and if required, an outdoor air in-
Basically, an indoor swimming pool can be de-
take.
humidified in two ways: by using condense
dehumidifiers or by using ventilation dehumidifiers.
TERMINOLOGY
Outdoor air: Air that is drawn in from
outside the building and
used as replacement air.
supply air
Exhaust air: The air that is blown
outside the building.
Supply air:
The dry, dehumidified air,
which is blown into the
pool room.
Extract air:
The humid air from the
extract air
pool room that is drawn
into the dehumidifier.
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Copyright © Dantherm 2016
outdoor air
exhaust air
The cooling unit consists of an evaporator, a
condenser and a compressor.
How does a condense dehumidifier work?
In a condense dehumidifier, the humid air is led
What does a ventilation dehumidifier consist of?
A ventilation dehumidifier consists of a fan, a
heat recovery section, a mixing section. and if
required, a heat pump.
over a cold coil (evaporator in the cooling unit),
and the water vapour in the air condenses into
water.
The cooling unit functions by letting a refrigerant evaporate at low pressure and low temperature in the evaporator and then condensing it
at high pressure and high temperature in the
condenser on the other side of the compressor.
In some types of condense dehumidifiers, there
is also the option of taking some of the dry outdoor air in – up to 30 % – if there is a need to
take air quality and comfort into consideration
or if there is a requirement in consideration of
In a ventilation solution, the air is completely
the dehumidification needs.
or partially replaced. It may be preferable to let
some of the airflow recirculate, so that anything
A condense dehumidifier generates energy
between 0 % to 100 % of the air is circulated,
because of the condensation process and the
depending on the requirements. The airflows
compressor and fan power input. The thermal
are mixed in the dehumidifier’s mixing section.
contribution from a condense dehumidifier is
significant and should be included in the overall
How does a ventilation dehumidifier work?
thermal loss calculation.
In a ventilation solution, the humid warm air
is extracted from the pool room and replaced
If desired, the surplus energy or some of it can
with dry outdoor air. The energy from the warm
periodically be removed via a water-cooled
humid air in the swimming pool room is recov-
condenser or an external air-cooled condenser.
ered in the heat recovery section, normally in a
plate heat exchanger.
DEHUMIDIFICATION USING
VENTILATION
In a ventilation dehumidifier with a heat pump,
In small swimming pools with high comfort
and a dedicated heat pump. This solution pro-
standards or large public pools, it will often be
vides better heat recovery and minimises the
necessary to replace a large part of the air for
necessary outdoor air intake. The heat pump
comfort and for hygiene considerations, and a
will warm the air during winter and can also
ventilation solution is the best solution.
dehumidify the air during the night, if there is
the heat pump functions both as a dehumidifier
a need for this.
13
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Copyright © Dantherm 2016
6
WHICH TYPE OF DEHUMIDIFIER
SHOULD YOU CHOOSE?
Shown below is a list of simple characteristics, which can help you to decide which type of dehumidifier is the right choice.
CONDENSE DEHUMIDIFIER
Advantages
Disadvantages
Easy to install and use
Generates heat
Low investment
Can only take a limited volume of outdoor air
VENTILATION DEHUMIDIFIER
Advantages
Disadvantages
Optimal regulation of humidity and
Cannot be used when the outdoor air is more
temperature
humid than the indoor air.
Up to 100 % outdoor air
Higher investment than the condense
dehumidifier
Free cooling
Requires more space than the condense
Active cooling option
dehumidifier
In small pools and spas there is rarely a desire for large volumes of outdoor air. In these cases, people
will often choose a condense dehumidifier, since the investment is small and it is simple to use.
In medium large pools, private pools or hotels, the choice will be between a condense dehumidifier
and a ventilation dehumidifier, depending on several factors: requirements for the volume of outdoor
air, level of comfort and the size of the budget. If there is a strong requirement for the volume of
outdoor air and comfort, and the budget is large enough, the choice will tend to favour a ventilation
dehumidifier.
In large public swimming pools, because of the number of users, the requirement for the volume of
outdoor air will often mean that ventilation dehumidifiers are the correct solution. But if the outdoor
air is more humid than the indoor air for long periods of time, the choice will of course be a condense
dehumidifier.
15
Copyright © Dantherm 2016
7
TEMPERATURE
MANAGEMENT
In addition to dehumidification, the dehumidifier
Free cooling (only with dehumidification
can also be used to regulate temperature of the
using ventilation)
air and pool water. However, the pool water can
When the summer sunlight shines through the
only be warmed by a unit that has a built-in cool-
windows, the swimming pool often warms to
ing circuit.
a temperature that exceeds the desired room
temperature. If the actual room temperature
HEATING/COOLING THE AIR
The thermal requirements for a swimming pool
is higher than the desired setpoint and higher
than the outdoor air temperature, then you have
the possibility of utilising free cooling.
are determined by several factors:
With free cooling, the cooler outdoor air can be
»» Ventilation loss, both mechanical and through
drawn past an exchanger through a by-pass, so
infiltration loss from leaks in the building.
that the outdoor air is not further warmed. In
»» The building’s transmission loss, i.e. the ther-
this way, the outdoor air can help to lower the
mal loss through walls, ceilings, windows, etc.
room temperature. The control of the free cool-
»» Solar gains eg sunlight entering through
ing is fully-automatic, done through the unit’s
windows.
own control unit.
Depending on which dehumidifier has been
Cooling with reversible heat pump (only
chosen, there are different options available for
with dehumidification using ventilation)
temperature regulation.
In some countries, free cooling is not sufficient,
Heating coil
A heating coil is the most popular way to con-
and in those cases it is possible to build a heat
pump in a reversible cooling unit using a 4-way
valve.
trol the temperature. Depending on the unit,
the heating coil is run by an ON/OFF (small unit)
Reversible means that the heat pump reverses
or 0–10 V signal (large unit).
the flow of the refrigerant, so that the section that
was originally an evaporator in relation to the ex-
There are two different types of heating coil: A hot
haust air now becomes a condenser, and the sec-
water coil for connecting the central heating sys-
tion that was originally the condenser in relation
tem and an electrical heating coil. Both types can
to the outdoor air, now becomes an evaporator.
normally be supplied in different sizes, depending
on water temperature and heating requirements.
Thus it is now possible to activate the further
cooling of the warm outdoor air. The outdoor
A unit that dehumidifies using outdoor air, must
air is drawn across a cold coil and cooled down.
always have a heating coil. A condense dehu-
The control of the 4-way valve and subsequent-
midifier only needs a heating coil if it operates
ly the cooling, is fully-automatic, done through
with a certain portion of outdoor air or in con-
the unit’s actual control unit.
nection with recirculation, where there is no further heating in the pool room.
16
Copyright © Dantherm 2016
Cooling using a cooling coil
for active cooling of the pool room without hav-
If the cooling capacity of a reversible heat pump
ing an extra built-in cooling coil.
is insufficient, or a condense dehumidifier installed in a country with a hot and humid cli-
External air cooled condensers are not normally
mate, a cooling coil is often necessary. Depend-
supplied by Dantherm, but Dantherm makes
ing on the unit, the cooling coil is run by an ON/
all of the necessary data available for the cal-
OFF (small unit) or 0–10 V signal (large unit).
culation of these. Condense dehumidifiers are
supplied ready to be connected to the external
There are two different types of cooling coil: A
condenser. The control of the external condens-
water cooling coil for a central cooling unit or
er is fully-automatic, done through the unit’s
a DX cooling coil for direct expansion to a sep-
control unit.
arate compressor unit. Both types can normally be supplied in different sizes, depending on
cooling requirements.
POOL WATER HEATING
The heating requirements of the pool are mainly
In countries with very hot summers, the abso-
determined by two factors:
lute humidity of the outdoor air can be too high
to use outdoor air to dehumidify with. In those
»» Evaporation from the pool water.
situations, a cooling coil can be used for dehu-
»» The pool’s transmission loss, i.e. the thermal
midification of the outdoor air.
loss through the pool’s bottom and sides.
Since the outdoor air in this case must be
With dehumidifiers with built-in cooling units or
cooled down by a great deal to be dehumidi-
heat pumps, it is possible to have the dehumidifi-
fied, the cooling coil must be positioned before
er delivered with a built-in water-cooled condens-
the built-in heating coil. In this way, it is possible
er as a supplement to the air-cooled condenser.
to warm up the air again to avoid too cold air
being blown into the pool room.
In a condense dehumidifier, warm air is always
added when the compressor is operating, and in
Cooling using an external condenser (con-
some cases – especially when the temperature
dense dehumidifier only)
outside increases and the heating requirement in
A condense dehumidifier will always produce
the pool room falls – the excess heat is undesira-
some excess heat. This is due to the electrical
ble. In such situations, a water-cooled condenser
energy that is used in the compressor, and that
can be used and the excess heat utilised to warm
every single litre of condensed water produces
the pool water or utility water.
a thermal output of around 0.7 kW.
In other words, with a water-cooled condenser
Often a water-cooled condenser is built into this
more comfort is achieved than with a condense
unit. This makes it possible to transfer the excess
dehumidifier. Furthermore the running costs will
heat to the pool water or to the utility water.
decrease.
However, in countries with a hot climate during
A ventilation dehumidifier does not pose the
the summer, the excess heat from the unit is of-
same problem with excess heat that arises with a
ten greater than the water’s thermal loss, so the
condense dehumidifier. If the temperature in the
excess heat must be dealt with in some other way.
room is too high, if required, the compressor can
simply be switched off, since dehumidification is
In this situation, it is possible to use an external
carried out using outdoor air. In other words, a wa-
air-cooled condenser. This means the excess
ter-cooled condenser in this type of dehumidifier
heat can be transferred fully to the outdoor air,
does not provide more comfort, but it will be able
and it is even possible to transfer more than
to extend the operating time of the compressor
that. Thus, an external condenser can be used
and thus utilise the excess heat more efficiently.
17
Copyright © Dantherm 2016
8
HOW TO DETERMINE THE
OPERATING CONDITIONS
VDI 2089
Based on the physical laws there are exact for-
THE ROOM’S RELATIVE
HUMIDITY (RH VALUE)
mulas to calculate the humidity load from an
The setpoint should be an RH value of 50–60%.
indoor swimming pool. These formulas are
You can also choose to operate with a differ-
however complicated to use in practice. This
entiated setpoint, so that it is low during win-
has lead the German institure VDI to make a
ter (50 %RH) to avoid condensation problems
guideline which comprises recommendations
on cold surfaces, and high during summer
for which values to set for internal condition,
(60 %RH) to reduce the operating costs. When
outside condition and amount of outdoor air.
the temperature is high during the summer,
VDI has also made a simplified formula where
condensation problems do not occur.
you can use data from a project and calculate
humidity load. This guideline is called VDI 2089
Above 60 %RH, the higher the RH value the poor-
and it is normal standard in Europe and it is the
er the comfort level, and there is an an increasing
guideline which we use at Dantherm.
risk of condensation problems and fungal attack.
An RH value that is lower than 50 %RH is not
THE ROOM TEMPERATURE
In consideration of both comfort and budget,
appropriate, because evaporation will increase
and this means greater dehumidification requirements and increased operating costs.
the air temperature inside a swimming pool
should be higher than the water temperature.
midification requirement. However, it should be
WATER CONTENT IN THE
OUTDOOR AIR
noted that all else equal, increased room tem-
The water content in the outdoor air (X outdoor
perature also means a higher heating bill.
air) varies a lot over the year, more or less all
This minimises evaporation and thus the dehu-
over the world. From more than 12 g water/kg
In general, it is recommended that the room
air during the summer an down to 2 g water/kg
temperature is set to 2 ºC higher than the water
air during the winter.
temperature. Only in therapy baths and spas
should the air temperature be allowed to be
VDI has chosen 9 g water/kg air as the value that
lower than the water temperature.
characterises outdoor air in Northern Europe
and we use this figure in DanCalcTool. This is be-
THE WATER TEMPERATURE
Copyright © Dantherm 2016
ed approx. 20 % of the year. (learn more about
When setting the water temperature, the fol-
DanCalcTool in section 11 "How to Dimension
lowing is often the case:
the Dehumidifier" on page 36.)
Private pools and hotels: 26–30 ºC
However, other values can be used for outdoor
Public swimming pools: 26-28 ºC
air in the calculation program DanCalcTool, if
Competition swimming: 24-27 ºC
the values deviate significantly from the North-
Therapy baths: 30-36 ºC
ern European standard.
Spa: 36-40 ºC
18
cause the value 9 g water/kg air is only exceed-
In addition, VDI 2089 recommends that the ab-
Day and night
solute water content does not exceed 14.3 g
In general, a dehumidifier should be installed
water/kg air (54 %RH with an air temperature of
according to daytime operations since the
30 C), if the water content of the outdoor air is
evaporation is greatest during the day, when
less than 9 g water/kg air, which will be the situ-
the pool is used the most. It is during daytime
ation during winter.
operations that you must assess the level of
activity that best describes the way the pool is
During the summer a higher water content in the
being used.
indoor air can be permitted, since the temperature in the air that enters from outside is high and
Winter and summer
thus does not contribute to condensation.
When outdoor air is incorporated in the installation, you must use the summer load as the
OUTDOOR AIR’S
SIGNIFICANCE
Outdoor air temperature
point of departure for the determining the humidity load. The water content in the outdoor
air is highest during the summer. You must ensure that the dehumidifier is sufficiently large to
deal with the humidity load with 100 % outdoor
The outdoor air temperature and the water
air volume during the summer. During the win-
content in the outdoor air affect the choice of
ter, the outdoor air is very dry and thus will in-
dehumidifier type. For example, low outdoor air
crease the dehumidification, so in that situation
temperature will favour a ventilation solution
the dehumidification capacity will be more than
with a heat pump.
enough.
Outdoor air RH value
Volume of outdoor air
The RH value of outdoor air is related to the wa-
VDI 2089 states that the volume of outdoor air
ter content in the outdoor air. The water content
must be at least 15 % of the circulating air. This
in the outdoor air influences the overall humid-
applies for public and commercial pools.
ity load and if the water content in the outdoor
There are no specific requirements in VDI 2089
air is higher than the water content in the pool
for the addition of outdoor air in private pools.
room, the condense dehumidifier must have a
larger capacity.
Copyright © Dantherm 2016
9
HOW TO CALCULATE THE
HUMIDITY LOAD
There are three factors that must be taken into
However, we have elected to adjust the con-
consideration when calculating the humidity
stants for the level of activity that VDI 2089 has
load from a swimming pool. The evaporation
set for private pools and hotel pools, since we
from the pool, together with the bystanders
believe, that VDI 2089 uses inappropriately high
and users, contributes positively to the humid-
values for the level of activity in these two areas.
ity load, while it is normally the opposite with
the outdoor air.
In addition, in small private pools it will often
be the air circulation that defines the need for
»» Evaporation from the pool (+)
dehumidification, and not how much activity
»» Users and bystanders (+)
there is in the pool.
»» Outdoor air (-)
The following factors are used to calculate the
THE EVAPORATION FROM
THE POOL
evaporation from the pool:
»» Water temperature
The calculation of the evaporation from the
»» Air temperature
pool can be carried out in accordance with
»» Air humidity
different formulas. At Dantherm, we use the
»» Pool area
German guideline VDI 2089, which is the normal
»» Level of activity in the pool
standard in Europe.
Set the values in the formula below.
W = e/(RD × T) × (Pb - Pl) × A
= Evaporated water (l/h)
W
e =Level of activity in the pool
RD = Gas constant = 461.5 (J/kg K)
T = Average between air temperature and
water temperature (K)
Pb = Saturated vapour pressure, water (Pa)
Pl = Partial vapour pressure, air (Pa)
A = Pool area (m2)
20
Copyright © Dantherm 2016
Level of activity, e
If a more precise calculation of the humidity
The level of activity in different types of pools is
load is desired, then a weighted level of activity
listed below.
can be chosen, where both daytime load and
The values are generated automatically when
nighttime load is calculated, and then a weight-
the pool type is selected in DanCalcTool. For
ed average activity load is calculated.
example, if you enter private pool it will automatically calculate with e = 9.5.
However in this case, it is important to note that
there can be periods with peak load, where the
e = 9.5 for private pools
general setpoint cannot hold, and so there is a
e = 11 for hotel pools, normal activity
need to assess whether the consequences with
e = 18 for hotel pools, high activity
operating with a lighter under-dimensioned de-
e = 14 for therapy pools
humidifier during a period of time is acceptable.
e = 20 spa/Jacuzzi*
However in general, Dantherm recommends
e = 2 8 for public swimming pools, water depth
that dimensioning is carried out in accordance
more than 1.35 m
with peak load situations.
e = 4 0 for public swimming pools, water depth
less than 1.35 m
e = 50 for wave pools
* assumes 30 minutes operation and 30 minutes
stop.
When the sensitivity of the calculation must be
assessed, it should be noted that the evaporation from the pool increases when:
»» The water temperature increases
»» The room temperature decreases
VDI 2089 includes wet areas around the pool
»» The RH value decreases
(tiles, etc.) and overflow gutters in the epsilon
»» The activity in the water increases
factors.
There is a large difference in the values for pri-
USERS AND BYSTANDERS
vate and public facilities, which results in dispro-
When a public swimming pool is used for com-
portionately large differences in the calculated
petitive swimming, the temperature of both the
humidity loads. In some cases, it is therefore
air and water is usually reduced. This means that
advisable to carry out an individual assessment
the humidity load decreases, so that the extra
of the level of activity and to set "e" accordingly.
humidity contribution from the users and bystanders is counteracted by reduced humidity
This can be done by selecting “manual water
from the actual pool.
transfer coefficient” in DanCalcTool, e.g. should
an indoor pool at a university be assessed indi-
It is thus not necessary to add separate humidi-
vidually. It is not a public pool, but it should be
ty contributions from users and bystanders.
considered more as a hotel pool with a high level of activity. In that case, e = 18 can be chosen.
21
Copyright © Dantherm 2016
OUTDOOR AIR
The air quality in a pool room is crucial for com-
OTHER FACTORS
fort, and poor air quality is often associated with
The size of the room
a high RH value and high levels of chlorine or
The air circulation is just as important as the
CO₂.
capacity of the dehumidifier. If insufficient air
moves around the room, there will be areas
In other words, the addition of outdoor air is a
where the dry air does not pass through and
crucial factor in ensuring good comfort. At the
thus those areas will not be dehumidified. The
same time, the outdoor air is a crucial part of the
room’s size is therefore crucial to how much
basis for the choice of the type of dehumidifier
volume of air the dehumidifier must be able to
and the size of the dehumidifier. The outdoor air
deal with. To learn more see "Air Circulation" on
is often crucial for the dehumidification of the
page 38.
room, since the water content in the outdoor
air normally is less than the water content in the
Covering the pool
room air.
If the pool is covered over at night when it is not
used, evaporation from the pool will be mini-
During the summer, the outdoor air in some geo-
mised. Doing this can save a lot of energy.
graphical areas, primarily the Middle East and
Asia, can for longer periods of time be so humid
Room insulation
that it is necessary to dehumidify the outdoor
The worse the insulation, the lower the set-
air before it is added to the room. For example,
point for the RH value has to be. In some cases,
this can be done using a cooling coil.
50 %RH may be required to avoid condensation
problems. For examples of condensation prob-
If the pool is used for competition swimming,
lems, see: “Understand the air” on page 6.
where there are greater numbers of users and
bystanders, then a separate calculation for the
Height (level)
necessary volume of outdoor air must be made,
In general, the formulas apply at atmospheric
This calculation shall be made on the basis of
pressure of 1,013 mbar (sea level), but they can
local regulations.
easily be applied to heights of up to 1,500 m. At
higher heights, individual assessments should
be carried out.
22
Copyright © Dantherm 2016
Copyright © Dantherm 2016
24
Copyright © Dantherm 2016
10
SELECTING THE TYPE OF
DEHUMIDIFIER
In the section "Which Type of Dehumidifier Should You Choose?" on page 15, some of the advantages and disadvantages of the two types of dehumidifier are stated, and where the two types are
normally used.
In this section, we will look in more detail at the different types of dehumidifier that Dantherm supplies
– from small private pools, to major public swimming pools.
Ventilation dehumidifiers
DanX XD/HP
DanX XKS/XWPRS/XWPS
Condense dehumidifiers
CDP/CDP-T 40, 50, 70
CDP 75, 125, 165
DanX AF
0
20
40
60
80
100
120
140
160
180
200
220
240
260
pool area in m2
25
Copyright © Dantherm 2016
CDP 40, 50 AND 70
CDP 40, 50 and 70 are condense dehumidifiers for smaller, private swimming pools and spa pools.
They are positioned in the pool room. The three different sizes cover a dehumidification capacity of
34 l/day to 68 l/day.
pool area in m2
0
26
Copyright © Dantherm 2016
20
40
60
80
100 120 140 160 180 200 220 240 260
CDP 40T, 50T AND 70T
CDP 40T, 50T and 70T are condense dehumidifiers for smaller, private swimming pools and spa pools.
They are positioned in the adjoining technical room. The three different sizes cover a dehumidification
capacity of 34 l/day to 68 l/day.
pool area in m2
0
20
40
60
80
100 120 140 160 180 200 220 240 260
27
Copyright © Dantherm 2016
CDP 75, 125 AND 165
CDP 75, 125 and 165 are condense dehumidifiers for larger private swimming pools, fitness centres,
hotel pools and smaller public swimming pools. The dehumidifier is positioned in the technical room
and the air is transported through ducts to and from the pool room. The control panel can be positioned on both sides of the dehumidifier, and the supply air can be blown in horizontally or vertically.
Up to 15% of the outdoor air can be added by the dehumidifier via a separate outdoor air duct. The
dehumidifiers are available in a version with a water-cooled condenser, so the excess heat can be used
to heat the pool water or the utility water.
The three dehumidifiers for connection to a duct system are available with a dehumidification capacity of 65 l/day to 162 l/day.
pool area in m2
0
28
Copyright © Dantherm 2016
20
40
60
80
100 120 140 160 180 200 220 240 260
DANX AF
DanX AF is a condense dehumidifier, i.e. the humidity condenses on a cold evaporator coil. This means
that the cold part of the heat pump is used for dehumidification.
DanX AF is a good solution for swimming pools with less activity, e.g. hotel pools and swimming pools
where there is limited space, so the unit can be installed under the ceiling. It is perfect for controlling
the air humidity and temperature, and at the same time, it has very low operating costs. It is possible to
add up to 30% outdoor air. DanX AF is ideal when the requirements for the volume of outdoor air are
less stringent, and in geographical areas where the outdoor air is so wet, that dehumidification is not
possible with 100 % outdoor air. In such cases, the air can be recirculated and only a smaller volume of
air will be replaced with outdoor air.
pool area in m2
0
20
40
60
80
100 120 140 160 180 200 220 240 260
29
Copyright © Dantherm 2016
DANX XD
DanX XD is a ventilation dehumidifier with a double cross-flow heat exchanger (2-step heat exchanger). DanX XD is a compact unit with high efficiency and has a built-in mixing, which ensures that
only the necessary volume of air is replaced. Thus it ensures high comfort and very energy economic
operation.
pool area in m2
0
30
Copyright © Dantherm 2016
20
40
60
80
100 120 140 160 180 200 220 240 260
DANX HP
DanX HP is a compact ventilation dehumidifier with a double cross-flow heat exchanger and heat
pump (2-step heat exchanger). The combination of heat pump and highly efficient double cross-flow
heat exchanger ensures very low operating costs and the optimal solution for low outdoor air temperatures. The integrated mixing ensures that no more outdoor air than necessary is taken in to achieve
a good indoor climate.
pool area in m2
0
20
40
60
80
100 120 140 160 180 200 220 240 260
31
Copyright © Dantherm 2016
DANX XKS
DanX XKS is a ventilation dehumidifier with a very efficient cross-flow heat exchanger. DanX XKS is
perfect for controlling the air humidity and temperature in a swimming pool, and with a temperature
efficiency of up to 80 %, it reduces operating costs and energy consumption.
The built in mixing function ensures that only the precise volume of outdoor air needed to maintain
a pleasant climate is added.
pool area in m2
0
32
Copyright © Dantherm 2016
20
40
60
80
100 120 140 160 180 200 220 240 260
DANX XWPS
DanX XWPS is a ventilation dehumidifier with a cross-flow heat exchanger with a built-in heat pump. A
temperature efficiency of up to 100 % reduces operating costs and energy consumption. The built-in
mixing ensures that only the precise volume of outdoor air that is necessary for maintaining a pleasant
indoor climate is added. To achieve even greater energy savings, a water-cooled condenser can be
integrated in the heat pump. In this way, the excess heat can be utilised efficiently to warm the pool
water or the utility water.
pool area in m2
0
20
40
60
80
100 120 140 160 180 200 220 240 260
33
Copyright © Dantherm 2016
DANX XWPRS
DanX XWPRS is a ventilation dehumidifier with a cross-flow heat exchanger with a reversible heat
pump. This means it delivers the same functions and benefits as the XWPS.
In addition, the reversible heat pump means the unit can operate with active cooling during the summer period. It is especially suitable for therapy baths with a high heat load from the hot pool water or
buildings with large glass facades.
pool area in m2
0
34
Copyright © Dantherm 2016
20
40
60
80
100 120 140 160 180 200 220 240 260
Copyright © Dantherm 2016
11
HOW TO DIMENSION THE
DEHUMIDIFIER
Once we have calculated the humidity load,
When entering data into DanCalcTool, you do
and we have determined the type of dehumid-
not need to consider this. Based on the entered
ifier we will use, we are ready to dimension the
data, the program will automatically take into
dehumidifier’s size and accessories.
consideration the difference and give proposals
with both condense dehumidifiers and ventila-
A certain amount of safety is included in the cal-
tion dehumidifiers, which can meet the require-
culation. There is therefore no need for a safety
ments.
factor on the calculated humidity load when
determining the size of the dehumidifier.
If you do not use the DanCalcTool, but read the
data on a capacity diagram, it is important that
The dehumidifier’s necessary capacity is calcu-
you choose the dehumidifier’s size on the basis
lated a little differently, depending on whether
of the actual operational data.
it is a condense dehumidifier or a ventilation
dehumidifier.
THE DEHUMIDIFIER’S NECESSARY CAPACITY
DEHUMIDIFICATION USING CONDENSE
DEHUMIDIFICATION
In a condense dehumidifier, both the dehumidifier and the outdoor air contribute to the dehumidification, so the dehumidifier’s necessary capacity, W capacity dehumidifier, is found by
using the formula stated below. W states the humidity load calculated in accordance with VDI
2089.
W capacity dehumidifier = W – W outdoor air
W capacity dehumidifier can be read in the capacity diagrams in the catalogue material. If you
use DanCalcTool, the capacity is read automatically and the program devises proposals for solutions.
W capacity dehumidifier = necessary capacity dehumidifer (l/h)
W outdoor air = minimum 15 % of the recirculated volume of air, K (m3/h), must be outdoor air in accordance with VDI 2089
W= humidity load according to VDI 2089 (l/h)
W outdoor air = 0.15 × K ρ × (X indoor air – X outdoor air) (l/h)
1000
X outdoor air = water content outdoor air (g water/kg air) = 9 g water/kg air in accordance with VDI 2089
X indoor air = water content at setpoint in the swimming pool (g water/kg air)
ρ = the air density = 1.175 kg/m3
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Copyright © Dantherm 2016
DanCalcTool
DEHUMIDIFICATION USING VENTILATION
In a ventilation dehumidifier, the dehumidifier must be able to supply the necessary capacity with
a summer load, because the outdoor air in those circumstances is the most humid. In this situation
with 100 % outdoor air, the dehumidifier must have a minimum capacity that corresponds to the
humidity load, i.e. W = W capacity dehumidifier, calculated in accordance with VDI 2089.
For a ventilation unit, the dehumidifier must be installed in accordance with the volume of air, Q,
which is replaced in the room. It is determined by the following formula:
Q = 1000 × W capacity dehumidifier/(ρ × (X indoor air-X outdoor air)
The volume of air, Q, can be found in the catalogue. If you use DanCalcTool, you will automatically be shown dehumidifier solution proposals in the program.
Q = necessary air volume (m3/h)
W capacity dehumidifier = necessary capacity dehumidifer (l/h)
X outdoor air = water content outdoor air (g water/kg air) = 9 g water/kg air in accordance with VDI 2089
X indoor air = water content at setpoint in the swimming pool (g water/kg air)
ρ = the air density = 1.175 kg/m3
37
Copyright © Dantherm 2016
12
AIR CIRCULATION
The air circulation is defined as the total num-
The air circulation, Z, is defined as the volume
ber of times which the volume of air circulates
of air in the dehumidifier divided by the pool
in the room in an hour.
room’s size.
The air circulation must normally be Z = 3–10
Air circulation in a pool room is important, because air that moves does not condense as easily as air that is stationary. In other words, the air
times every hour.
3 ≤ Z ≤ 10
circulation must not be too small, since this will
give insufficient flow across surfaces. Very cold
With small pools, the humidity load from the
surfaces can cause condensation problems.
pool is often so small, that the air circulation on
Poorly insulated buildings lead to cold surfaces
its own determines the size of the dehumidifier.
and thus have a lot of influence on how much
air circulation is required.
In special cases, with a very small pool area in
a large room, you can alternatively plan with
On the other hand, excessively high air cir-
zone division or with decentralised circulation
culation is irritating in the form of noise and
systems.
draughts, so you cannot just circulate endless
large volumes of air.
Copyright © Dantherm 2016
Copyright © Dantherm 2016
13
AIR DISTRIBUTION
Distributing the air in the pool room also plays
If the room’s relative humidity is used as an in-
an important role. It is important that critical
put signal for the dehumidifier, it is important
areas and surfaces are supplied with sufficient
that the sensor is positioned in the extract
volumes of dry air.
duct or appropriately in the room. If it is placed
in sunlight or in a position where it is hit by
If you add outdoor air to the room, then exhaust
splashed water, there will be a risk of erroneous
air must also be extracted from the room. It is
measurements.
important because otherwise overpressure will
occur in the room, which can lead to condensa-
Avoid air being blown on the water surface, as
tion in the walls and chlorine odour in the adja-
this will increase the evaporation. The air above
cent areas. It can be done by dehumidifying the
the pool should be as still as possible and with a
pool room with one system, while the adjacent
maximal airspeed across the water of 0.15 m/s,
areas are dehumidified using a separate venti-
Of course due regard must be shown for swim-
lation system.
mers, so that they receive sufficient outdoor air.
To ensure negative pressure the volume of ex-
The return air, which is led back to the dehu-
haust air + extract air should be approx. 10 %
midifier, should be extracted from the opposite
higher than the volume of supply air. A solution
end of the pool room, so that “dead zones” are
with a condense dehumidifier and addition of
avoided where the air is not replaced sufficient-
outdoor air, must therefore have an exhaust fan
ly.
installed.
It is normally sufficient to position a return air
To ensure negative pressure in the pool room,
fan, which should be positioned high up in
the control of the exhaust air should relate to
the room, 3–5 m above the floor. In this way,
the control of the outdoor air.
short-circuiting of the supply air and the extract
air is avoided.
The control of outdoor air and exhaust air can
among other things, be based on the following
signals:
»» Sensor for relative humidity
»» Manual switch, e.g. cover. When the pool
cover is rolled back, the dehumidifier starts
automatically.
»» CO₂ sensor, alternatively CO₂ equivalent
sensor
»» Time setting in relation to daytime and
nighttime operation
40
Copyright © Dantherm 2016
There are two different ways to do this:
Below grade ducting
The warm dry air is sent up towards
the window panes. This is the optimal way to distribute air, because it
utilises the fact that warm air naturally rises up. In line with the dry air
rising up, it draws in the humidity,
and the humid air is extracted back
to the dehumidifier via a return
grate. The grate’s positioning is ideally 3–5 m high on the wall.
Ceiling ducting
Ceiling ducting can be used if the
supply duct extends to the ceiling,
because if required, dry air shall be
blown on a skylight. Approx. 80 %
of the air shall be blown on the
windows, while the rest of the air
is blown to the ceiling to avoid still
areas with cold humid air.
A skylight should add 10–20 % extra
air because of the risk of condensation.
41
Copyright © Dantherm 2016
14
REGULATING
THE VOLUMES OF AIR
Condense dehumidifiers
of air falls. If necessary, this can be solved us-
Regulating the volumes of air in condense
ing a de-icing kit (accessories). In this way the
dehumidifiers must be done as precisely as
dehumidifier can have an active de-icer, which
possible to achieve the dehumidification ca-
means that warm refrigerant is drawn through
pacity, which is stated in the documentation.
the evaporator, when this is about to ice up.
The capacity in the documentation is stated at
the nominal volumes of air and will change in
If the volume of air is too high, e.g. because the
line with changes in the volume of air passing
dehumidifier works against a small duct pres-
through the dehumidifier.
sure loss, this leads to problems with lower capacity.
Nominal volumes of air are stated on the ba-
42
Copyright © Dantherm 2016
sis of an external pressure loss. If the external
Ventilation dehumidifiers
pressure loss is exceeded, the result will be a
In a ventilation dehumidifier, it is the volume of
reduced volume of air, which will increase the
air at 100 % outdoor air, which is the basis for
risk of ice forming on the evaporator coil. The
regulating the volume of air and dimensioning
evaporation temperature falls when the volume
of the ducts.
15
STEP BY STEP – HOW TO
DIMENSION CORRECTLY
There are many factors that play a part in deter-
1
mining how you shall dimension a dehumidifier
Data for pool unit selection
Project:
Address:
for an indoor swimming pool.
Indoor temperature
Indoor humidity
Air volume
Pool type:
Date:
Ref.:
Air Summer:
°C
Air Winter:
°C
Summer: % RH
Winter:
% RH
Summer:
m³/h
Winter:
m³/h
Private
Summer:
°C
Winter:
°C
Summer: % RH
Winter:
% RH
Supply:
Pa
Pressure drop
Exhaust:
Pa
Public > 1,35 m Public < 1,35 m
Wave
deep
deep
°C
Pool hall volume
m³
Pool covered in the night time
Outdoor temperature
Outdoor humidity
Hotel
A manageable way to tackle the process is to
Pool size:
m²
Water temp:
Pool hall open in the summertime
use “Dantherm Selection Software” and go
Control system
Included:
Type of fans
Heating coil
Plug fans
Water temp.:
Supply air temp.:
Capacity
Separate cooling coil
Supply temp.:
Solution:
through the following three steps.
Yes
Cables:
Yes
No
No
Requested meters:
2 speed belt driven
1 speed belt driven
/
°C
Electrical:
kW
°C
kW
CW:
°C
Lacquering
Dehumidifier (AF type)
Internal
Yes
Fresh air damper:
1. First, you must determine the operational
Ventilation with heat recovery
(XKS type)
data for the project. Here it is advantageous if
No
Ventilation with recovery and
heat pump (XWPS type)
are certain that you have included everything.
Ventilation with recovery and
reversible heat pump
(XWP type)
2. The operational data is entered into the soft-
R 407c
External:
°C
R 134a
Yes
Water cooled condenser:
Remarks:
Yes
Supply filter :
°C
R 717
No
Yes
Remarks:
Extract filter:
you use a checklist (see illustration), so that you
°C /
DX: Evaporation temp.:
R 404c
Supply filter :
Water cooled condenser:
Extract filter:
Remarks:
Supply filter :
Water cooled condenser:
Extract filter:
Remarks:
Yes
Yes
Dantherm Air Handling A/S
.
Marienlystvej 65 DK-7800 Skive
Tel.: +45 96143700
www.dantherm-air-handling.com
dantherm.dk @dantherm.com
Fax: +45 96143800
.
VAT No. 20864591 ISO 9001 & 14001 Certified Company
ware’s calculation section, DanCalcTool, where
it is used to calculate the possible solutions for
the project.
2
3. We then select one or several solutions and
have them modelled and verified in the configuration section, DanConfTool, which can then
make a specific tender, for DanX. For CDP final
selection is done according to datasheets.
POOL DEHUMIDIFIERS CDP
3
IFIERS CDP
POOL DEHUMID
3
DIMENSIONS
CDP 35
DEHUMIDIFIER
800
Function
680
The CDP 35 is an energy-efficient
and quiet pool dehumidifier.
ItPOOL
works in ac
cordance with the condensation 800 680
DEHUMIDI
principle. A fan draws the humid
800 680
dehumidifier and through
air into the FIERS CDP
800 680
an evaporator coil. When passing
TECHNIC
through the evap
orator the air
ALdown
is cooled
DATAto below its dew
point temperature, and its con
tent of water vapour is condensed
into315water, which falls into the
Model
drip tray and
then is led from
the drip tray to a drain. The cold,
Operating
dry air is then passed
B
condenser coil
– humidity
CDPover
where itrange
35 the
is re-heated,
before leaving the unit at a
Operating
A
range – temperatu
temperature,
which is approx.
40 – 100 %RH
5°C higher
than at the315inlet.
re 315
Air volume
315
10 – 36 °C
Power supply
890
Applications:
250 m3/h
890
B
Max. ampere
950
950
1x230/50 V/Hz
A • Indoor swimming pools consumption
Max. power consumpt
• Therapy pools
2,8 A
ion
Refrigerant
• Spas
0,72 kW
position
Drain outlet
• Gymnasia Compressor
R407C
Quantity of refrigeran
Rotary
t
Sound level (at
1 metre)
0,600 kg
FEATURESWeight
47 dB(A)
Colour
• The CDP 35 is built into a strong
60 kg
and robust powder-coated hot-galvanized
Protection
sheet metal cabinetclass
RAL 7044 / 9016
• Evaporator and condenser
coils are epoxy-coated for higher IPX4
corrosion
resistance
• All external and internal parts
of the cabinet are powder-coated
CAPACITY
• The CDP
35 is fixedCURVES
to the wall by means of a wall
mounting strip supplied
with the unit
Min. 225
placing of
40 *400
40%
• The condensate
Recommended
*
outlet is locatedRH
at the bottom of the60%
RH35. The
CDP
stub can
outlet 80% RH
the CDP 35
35 be connected to a 1⁄2” water hose
• Air intake through a filter that
is placed behind the front panel
Min. 225
• Radial 30
fan
**400
• The CDP
25 35 can be floor mounted by
means of a floor mounting kit
(accessory) **800
20
• Optionally
the CDP pool dehumidifier can
be fitted with a water heating
coil (accessory)
15
Min. 225
10
g kit
Electronic
Floor mountin
5
**800
controldimensions indicate the placing
*The
1
in this series:
Also available
CDP 45
CDP 65
CDP 35T
CDP 45T
CDP 65T
CDP 75
CDP 125
CDP 165
data sheets)
(see separate
2
3
4
of the wall mounting
strip
The CDP 35 has a built-in hygrostat
and is fully automatic with electronic
trol. The hygrostat
0
con
is factory set to approx. 60%
645
RH.
* An easy to read display
0 current
indicates the
panel
status
0,5 of operation.
Min. 225
1
Accessories
Room hygrostat
kit
Floor mounting
kit
Ext. failure monitoring
coil
Water heating
data sheets)
(see separate
1,5
1. Power on
2. Dehumidification – the compressor
*
is on
3. Cooling
INSTALLA
circuit failure
TION – the dehumidifier is switched
ffo
2
l/h
2,5
*
Defrosting
Passive, demand-controlled
defrosting is incorporated in
the electronic control.
A sensor on the evaporator
coil ensures that the evaporator
is only defrosted
when required. The compressor
*
is switched
blows room air through the Warmer Dry Air ffo during defrosting and the fan
evaporator, thereby melting
645 rator.
the ice on the evapo
-
If the relative humidity has to Warm Wet Air
the wall
be adjusted
to the flooraorremote
frequently,
*To be fixed
room hygrostat
can be connected to the CDP
35.
s are in mm.
All dimension
Pool Area
dantherm.com
CDP 35/45/65
CDP 35/45/65 units
hall or area to be are designed for installation
directly in the pool
dehumidified.
dantherm.com
43
Copyright © Dantherm 2016
dantherm.com
ELECTRONICS COOLING
DEHUMIDIFICATION
VENTILATION
MOBILE HEATING & COOLING
Dantherm
The parent company is located in Denmark, and together with companies located
in Norway, Sweden, Germany and England, and a sales office in Russia, Dantherm
employs a total of 240 people.
We operate in the following business areas:
Dantherm Air Handling A/S
Marienlystvej 65,
7800 Skive, Denmark
www.dantherm.com
Electronics cooling
Climate control of electronics and batteries in radio base stations and other telecommunication infrastructure. Telecoms customers include network suppliers and
network operators.
Dehumidification
Mobile and stationary dehumidifiers, for e.g. drying buildings and damage control,
and for use in private pools and wellness centres.
Ventilation
Major ventilation units, which are used in swimming pools and for buildings that
require large volumes of air replaced, e.g. in shopping centres and cinemas. The
product programme covers residential ventilation units with high-performance,
in-house manufactured heat exchangers and smart controllers.
01.17.XXX
Thorvig Tryk, Skive
Mobile heating and cooling
Products for heating or cooling tents and equipment, which can be used by the
defence sector and aid agencies. Customers include primarily the defence sectors
in NATO countries and tent and container manufacturers.