Hilton Bayfront - Honeywell Smart Grid

Hilton Bayfront
Guestroom HVAC Energy Management System Evaluation
Presented to:
Presented by:
September 14, 2012
1) Contacts
Hilton San Diego Bayfront Hotel
1 Park Boulevard
San Diego, CA 92101
Tibor “Tip” Jozsa
Director Property Operations
t. 619.564.3333
tibor.jozsa@hilton.com
Sunstone Hotel Investors, Inc.
120 Vantis, Suite 350
Aliso Viejo, CA 92656-2686
Marc Hoffman, Chief Operating Officer
t: 949.382.3030
mhoffman@sunstoneHotels.com
Scott Broder, Analyst, Asset Management
t. 949.382.3044
sbroder@sunstoneHotels.com
Willdan Energy Solutions
3750 Convoy St, Suite 175
San Diego, CA 92111
Chikezie Nzewi, P.E., CEM, CBCP, LEED AP
Sr. Mechanical Engineer
t. 925.556.2600 x1719
c. 925.785.5119
cnzewi@willdan.com
Gwen Strickland
Senior Program Manager
t: 858. 292.1840 ext 1880
c: 31.386.4703
gstrickland@willdan.com
Joe Huff
Project Engineer
t: 858.292.1840 ext 1885
c: 858.880.5045
jhuff@willdan.com
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Hilton Bayfront Guestroom HVAC Energy
Management System Evaluation
2) Summary of Analysis Performed
Willdan Energy Solutions performed a detailed study to compare the energy savings from implementing
occupancy-based thermostats to control the fancoil units (FCU) providing space conditioning at the
guestrooms. The guestrooms are currently served by a floor-mounted fancoil unit recessed within a wall in
the guestroom near the building exterior and window. See Picture 1. Each FCU has a three (3) speed fan
and chilled water coils for cooling and hot water coils for heating. The existing wall thermostat controls the
fan speed whether the fancoil is operating in cooling or heating mode. See Picture 2.
Picture 1: Floor-mounted fancoil unit
Picture 2: Existing thermostat
In this study, the following thermostat control options and technologies were tested:
 Existing room thermostat (Inncom model E528)
 Telkonet room thermostat with ceiling mounted occupancy sensor
 Inncom occupancy based room thermostat with auxiliary door switch
Pictures of the tested technologies are shown below.
Picture 3: Telkonet Thermostat
Picture 4: Telkonet ceiling mounted
occupancy sensor
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Hilton Bayfront Guestroom HVAC Energy
Management System Evaluation
Picture 5: Inncom Thermostat
Picture 6: Inncom door switch
For each of the three options above, three guest rooms on identical orientations/exposures of the building
were studied. The Hotel ensured that the tested rooms given priority for occupancy. The performance of the
fancoil serving these guestrooms was tracked over a period of two (2) weeks. The following parameters were
tracked:
 Fancoil fan energy use
 Chilled water cooling energy use
 Hot water heating energy use
Independent monitoring devices were installed at each guestroom fancoil unit to measure fan power at low
speed, medium speed and high speed. Cooling chilled water supply and return temperature from each FCU
was measured and recorded. Heating hot water supply and return temperatures for each FCU were also
measured. To achieve this, a number of sensors with attached data loggers were installed in each FCU
cabinet. See Picture 7 & 8.
Picture 7: FCU Fan Power Logger and Sensors
Picture 8: FCU Chilled & Hot Water Temp Logger and Sensors
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Hilton Bayfront Guestroom HVAC Energy
Management System Evaluation
The following data was monitored with the given intervals:
 Chilled water supply temperature every minute
 Chilled water return temperature every minute
 Hot water supply temperature every minute
 Hot water return temperature every minute
 Fan low speed current and voltage, every 30 seconds
 Fan medium speed current and voltage, every 30 seconds
 Fan high speed current and voltage, every 30 seconds
From this data, the energy use for cooling, heating and fan operation was calculated; results are summarized
in the next section.
3) Hotel Occupancy During Test
To obtain actionable test data, Willdan instructed the Hotel reservation personnel to ensure that the none (9)
rooms selected for this test were always rented and continuously occupied. This ensured that none of the
rooms remained unrented and unoccupied and therefore would show significantly greater savings that the
rented and occupied rooms. Keeping all the rooms rented during the period of the test ensured that the
comparison utilized similar conditions across the various technologies.
During typical hotel operation, a percentage of the guestrooms are unoccupied and the energy savings that
can be realized from having active occupancy based temperature controls in these rooms will be significant.
4) Utility Incentive Calculations
It is critical to note that the current incentive calculations for San Diego Gas and Electric are based on an
established White Paper that quantified typical energy savings for occupancy based temperature controls in
hotel guestrooms.
The energy use of the typical guestroom with no occupancy based thermostat controls will be similar to the
energy usage numbers below as in this scenario, the HVAC system remains activated and maintaining an
occupied space temperature setpoint.
However, the energy use of the guestrooms with occupancy based thermostats installed will be significantly
lower, resulting in savings values that will be greater than shown in this study.
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Hilton Bayfront Guestroom HVAC Energy
Management System Evaluation
5) Test Results
Data from the two-week test was normalized to report energy savings for a one year period. It is important to
note that the Hotel gave significant priority to selling the nine test rooms, thus realized energy and cost
savings will be greater based on typical occupancy of 78% (as reported by Sunstone).
Control
Telkonet
Inncom
Annual Fan Energy Use Per Room (kWh)
Annual Fan Energy Use All Rooms (kWh)
Annual Fan Energy Savings (kWh)
Annual Fan Energy Savings (%)
930
1,106,998
N/A
N/A
548
652,122
454,875
41.1%
484
575,744
531,254
48.0%
Annual Cooling Energy Use Per Room (kWh)
Annual Cooling Energy Use All Rooms (kWh)
Annual Cooling Energy Savings (kWh)
Annual Cooling Energy Savings (%)
1,163
1,384,483
N/A
N/A
913
1,085,993
298,490
21.6%
898
1,068,643
315,840
22.8%
37
44,613
N/A
N/A
21
25,010
19,603
43.9%
32
38,077
6,535
14.6%
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
753,365
633
19,603
16.5
891,584
749
6,535
5.5
$113,381
$16,809
$130,191
31.5%
$134,183
$5,604
$139,787
33.8%
Annual Heating Energy Use Per Room (Therms)
Annual Heating Energy Use All Rooms (Therms)
Annual Heating Energy Savings (Therms)
Annual Heating Energy Savings (%)
Total Electric Energy Savings (kWh)
Total Electric Energy Savings Per Room (kWh)
Total Natural Gas Savings (Therms)
Total Natural Gas Savings Per Room (Therms)
Total Electric Savings Cost ($)
Total Natural Gas Savings Cost ($)
Total Energy Cost Savings ($)
1,190
$0.1505
$0.8575
Total Guest Rooms
Electricity Virtual Rate
Natural Gas Virtual Rate
The energy savings from installing each technology have been quantified for both electricity and natural gas,
and are tabulated in the table above. The study shows that the technology can deliver an annual energy cost
savings of over 31% for Telkonet and 33% for the Inncom system.
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Hilton Bayfront Guestroom HVAC Energy
Management System Evaluation
6) Product Comparison
SYSTEM PROPOSED & TESTED
EcoAir SS6550, EcoView Ceiling Sensor, Zigbee Network
Wireless E529 X07 HVAC Control, Door Sensor, CI Network
EQUIPMENT PHOTOS
EQUIPMENT COMPARISON
Customizable Display
Night Occupancy Mode
Built-in Occupancy Sensor
Demand-Response Ready
Electronic Door Lock Networking Capable
Minibar Networking Capable
YES
YES
YES
YES
NO
NO
QUANTITY (Per Proposal)
1200
YES
YES
YES
YES
YES
YES
Property has 1,190 guestrooms
GROSS PROPOSED COST
$497,444
GROSS COST PER ROOM
$415
$446
COST REDUCTIONS
Estimated SDG&E Incentive1
Buyback of Existing Thermostats
Additional Credit for Returned Thermostats
($162,233)
$0
$0
($162,233)
($72,660)
($17,000)
NET INSTALLED COST
$335,212
$288,479
$279
$238
748 / 750 / 752
850 / 852 / 854
NET INSTALLED COST PER ROOM
Test Rooms
Control Rooms: 746 / 754 / 844
[1]
w/ceiling mounted sensor
1211
$540,372
w/door sensor
Incentive is estimated and subject to chage pending review and approval from the CPUC (California Public Utilities Commission)
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Hilton Bayfront Guestroom HVAC Energy
Management System Evaluation
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