Alberta Farm Machinery Research Centre Printed: July 1989 Tested at: Lethbridge ISSN 0383-3445 Group 1e Evaluation Report 610 Indal Metals 5 HP Centrifugal Aeration Fan A Co-operative Program Between ALBERTA FARM MACHINERY RESEARCH CENTRE PAMI PRAIRIE AGRICULTURAL MACHINERY INSTITUTE INDAL METALS 5 HP SINGLE PHASE 3450 RPM CENTRIFUGAL FAN MANUFACTURER AND DISTRIBUTOR: Indal Metals Division of Indal Limited P.O. Box 3041 Saskatoon, Saskatchewan S7K 3S9 RETAIL PRICE: $1295.00 (July 1989, f.o.b., Lethbridge, Alberta) SUMMARY OF RESULTS TABLE 1. Indal Metals 5 hp Single Phase 3450 RPM Centrifugal Fan Performance at Typical Levels of Operation. Static Pressure Air Flow Rate Input Power Total Efficiency in wg (Pa) cfm (L/s) kW % Fan Speed rpm 0.51 1.00 2.00 3.00 4.60 5.00 6.00 7.00 8.00 9.00 9.98 (127) (249) (498) (747) (996) (1250) (1490) (1740) (1990) (2240) (2490) 4400 4310 4140 3986 3600 3420 3220 3010 2750 2440 1520 (2080) (2030) (1950) (1880) (1700) (1610) (1520) (1420) (1300) (1150) (718) 3.66 3.78 4.08 4.32 4.32 4.47 4.54 4.52 4.47 4.32 3.47 23 27 35 42 46 50 55 58 60 61 51 3517 3511 3499 3488 3484 3477 3474 3471 3471 3475 3518 FIGURE 1. Indal Metals 5 hp Centrifugal Fan: (1) Fan Housing, (2) Motor Control, (3) Motor Mount. RECOMMENDATIONS It is recommended that the manufacturer consider: 1. Supplying fan performance data over a complete range of static pressures. 2. Supplying detailed operating instructions containing illustrations and information on general operation, installation, maintenance, safety aspects and troubleshooting. Station Manager: R. P. Atkins Project Engineer: R. C. Maze THE MANUFACTURER STATES THAT With regard to recommendation number: 1. Fan performance data will be supplied with each fan. 2. A detailed operating and instruction manual will be supplied with each fan. GENERAL DESCRIPTION The Indal Metals 5 hp 3450 rpm centrifugal fan is a 14.5 in (368 mm) diameter, single speed, direct drive, centrifugal flow fan. It is primarily used for grain aeration or grain drying systems. The Indal Metals 5 hp centrifugal fan is equipped with a wire mesh guard grill, an inlet bell, duct mounting flange, and motor control switch. The steel impeller consists of a hub backplate, 9 backward straight blades and a flange. The impeller is directly mounted on the 5 hp (3.73 kW), single phase, 230 volt electric motor. The fan housing, motor mounts, and supports are of steel construction with a painted finish for corrosion protection. FIGURE 1 shows the location of major components while detailed specifications are given in APPENDIX 1. SCOPE OF TEST The Indal Metals 5 hp Centrifugal fan was tested in the outlet chamber setup (FIGURE 2) in accordance with test procedures developed by the Prairie Agricultural Machinery Institute and adopted by the Alberta Farm Machinery Research Centre. The intent was to determine the performance of the fan in terms of air flow rate, static pressure, input power and total efficiency. Fan performance was determined at 230 V. The fan was also evaluated for ease of operation, maintenance, operator safety and suitability of the operator’s manual. FIGURE 2. Schematic Fan Test Apparatus - Outlet Chamber Setup. RESULTS AND DISCUSSION All fan performance results in this report are given at standard air1 conditions so that direct comparisons can be made with other fan test reports. Fan performance under actual operating conditions could differ from these results by up to 10%, depending on such things as temperature, barometric pressure, humidity and elevation above sea level. Air Flow Rate: Fan output at typical levels of operation (i.e. static pressure2) are given in TABLE 1. The air flow rate ranged from 1520 cfm (718 L/s) at 9.98 in wg (2490 Pa) to 4400 cfm (2080 L/s) at 0.511 in wg (127 Pa). FIGURE 3 illustrates the fan performance curves for the Indal Metals 5 hp centrifugal fan. The manufacturer did not provide any information on rated performance. It is recommended that for fan selection purposes, the manufacturer consider supplying a table or curve of air flow rates over a complete range of static pressures. Power Consumption: The power consumption numbers given in TABLE 1 can be used to calculate the cost of operating the fan. To calculate the cost of fan operation, multiply the power consumption (kW) by the number of hours of fan operation times the cost per kilowatt hour. The power consumed by the fan depended upon the point of operation of the fan. The power consumption varied from 3.47 kW at maximum static pressure and minimum air flow to 4.54 kW at 6.0 in wg (1490 Pa) static pressure and an air flow rate of 3220 cfm (1520 L/s). The maximum amperage drawn by the motor was 18.9 amps, which was less than the rated motor amperage of 19.5 amps. Total Efficiency: Total efficiency is the ratio of air horsepower over the input power. Air horsepower is dependent upon the air flow rate and corresponding total pressure. For typical levels of operation, the total efficiency (TABLE 1), ranged from 23 to 61%. The maximum total efficiency of 61% occurred at 2440 cfm (1150 L/s) at a static pressure of 9 in wg (2240 Pa). EASE OF OPERATION Maintenance: No maintenance instructions were supplied. 1 Standard air is air with a density of 0.075 lbm/ft³ (1.2 kg/m³), 50% relative humidity and a barometric pressure of 29.92 in Hg (101.325 kPa). 2 Static pressure is a measure of the pressure difference between the pressure inside the building and the pressure on the outside of the building. Static pressure is usually expressed in inches of water gauge (in wg) or Pascals (Pa). Page 2 The inlet screen was easily removed which allowed for cleaning of the wheel and fan housing. Regularly scheduled maintenance will ensure longer motor life and optimum performance. APPENDIX I SPECIFICATIONS MAKE: MODEL: SERIAL NUMBER: MANUFACTURER: Indal Metals 5 hp Centrifugal Aeration Fan 588001 Indal Metals - Division of Indal Ltd. P.O. Box 3041 Saskatoon, Saskatchewan S7K 3S9 OVERALL DIMENSIONS: -- housing width -- housing depth -- housing height -- inlet bell diameter -- guard grill diameter -- grill opening 25.5 in (648 mm) 26.5 in (673 mm) 31.5 in (800 mm) 10.3 in (260 mm) 13.0 in (330 mm) 0.13 in (3 mm) diameter wire spaced at 0.5 in (13 mm) 9.25 in (235 mm) by 16.8 in (425 mm) -- discharge opening IMPELLER: -- diameter -- inside flange diameter -- number of blades -- blade angle -- blade width 14.5 in (368 mm) 12.5 in (318 mm) 9 28° 3.5 in (89 mm) WEIGHT: 215 lb (98 kg) MOTOR NAMEPLATE DATA: -- make -- specifications -- frame -- class -- series -- design -- code -- rpm -- service factor -- ambient temperature rise -- volts -- amps -- phase -- cycles -- horsepower Baldor 36F500W957 184T F F588 L F 3450 1.0 40° C 230 V 19.5 A single 60 Hz 5 hp (3.73 kW) FIGURE 3. Indal Metals 5 hp Fan Performance Curves. OPERATOR SAFETY The guard grill provided adequate protection from the fan blades. The motor was a totally enclosed unit and presented no safety hazards. The Indal Metals 5 hp, single phase, 230 volt fan was CSA approved. The noise level for the Indal Metals 5 hp Centrifugal fan, at a distance of 4.9 ft (1.5 m) from the centre of the fan inlet, while operating at a 1 in wg (249 Pa) static pressure, was 92 dB(A). Higher noise levels could be expected if the fan was operated in the vicinity of other buildings. The Indal Metals 5 hp Centrifugal fan falls within range 4 of the Alberta Farm Machinery Research Centre noise level range classification (APPENDIX II). The noise level produced could damage hearing, depending on exposure time. Ear protection is definitely recommended. OPERATOR’S MANUAL No operator’s manual was supplied. It is recommended that the manufacturer consider supplying a detailed operator’s manual containing information on maintenance, installation, rated performance, safety aspects and trouble shooting. Range 1 2 3 4 APPENDIX II NOISE LEVEL RANGES SOUND LEVEL (dBA) Comments up to 45 Tolerable, low level background noise. 45 to 60 Dominating background noise that would interfere with normal conversation. 60 to 85 Could be annoying and be detrimental to hearing and operator performance under long-term continuous exposure. Ear protection should be considered. over 85 Could damage hearing, depending on level and exposure time. Ear protection is definitely recommended. SUMMARY CHART INDAL METALS 5 HP CENTRIFUGAL AERATION FAN RETAIL PRICE: FAN DESCRIPTION: FAN PERFORMANCE: Air Flow Rate: -range -at maximum efficiency Power Consumption: Total Efficiency: OPERATOR SAFETY: OPERATOR’S MANUAL: $1295.00 (July, 1989, f.o.b. Lethbridge) 14.5 in (368 mm) single speed, direct drive, 5 hp (3.73 kW), single phase, 230 volt electric motor 1520 to 4400 cfm (718 to 2080 L/s) 2440 cfm (1150 L/s) at a 9 in wg (2240 Pa) static pressure 3.47 to 4.54 kW maximum 61% guard grill provided, CSA approved motor noise level = 92 dB(A) at 4.9 ft (1.5 m) from fan inlet none supplied Prairie Agricultural Machinery Institute Head Office: P.O. Box 1900, Humboldt, Saskatchewan, Canada S0K 2A0 Telephone: (306) 682-2555 3000 College Drive South Lethbridge, Alberta, Canada T1K 1L6 Telephone: (403) 329-1212 FAX: (403) 329-5562 http://www.agric.gov.ab.ca/navigation/engineering/ afmrc/index.html Test Stations: P.O. Box 1060 Portage la Prairie, Manitoba, Canada R1N 3C5 Telephone: (204) 239-5445 Fax: (204) 239-7124 P.O. Box 1150 Humboldt, Saskatchewan, Canada S0K 2A0 Telephone: (306) 682-5033 Fax: (306) 682-5080 This report is published under the authority of the minister of Agriculture for the Provinces of Alberta, Saskatchewan and Manitoba and may not be reproduced in whole or in part without the prior approval of the Alberta Farm Machinery Research Centre or The Prairie Agricultural Machinery Institute.
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