Answered: W(e,fan1) =40 kW and is operated for…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter13: Heating Control Devices

Section: Chapter Questions

Problem 1RQ

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An energy service company agreed to convert all 18 constant volume air-handling units (AHUs) within a commercial building into variable-air-volume systems by installing variable frequency drives (VFDs) and VAV terminal boxes. To verify fan energy savings, it was agreed to meter only two AHU. Metering all 18 AHUs was determined to be economically infeasible. The metering of AHUs revealed the following: (a) the supply fan 1 is rated at kW(e,fan1) =40 kW and is operated for 5,800 hours/year, and (b) the supply fan 2 is rated at kW(e,fan2) =38 kW and is operated for 6,100 hours/year, and (c) the VFD operates according to the following load profile: % of Speed Fan 1, hours Fan2, hours 100 350 480 90 485 750 80 1080 980 70 1350 1240 60 1940 2010 50 210 320 40 265 210 30 120 110 It was agreed that the energy use of one motor is proportional to its speed squared. Determine the fan energy and cost savings for the CV to VAV conversion for all the AHUs as stipulated in the agreement which states that the annual fan energy savings for all the AHUs is simply 18 times the average fan energy savings estimated from the metered AHUs. Assume that electricity costs $0.11/kWh. Question 10 options: the annual fan energy saving is 4092.8 MWh/yr and cost saving is $450206/yr the annual fan energy saving is 3592.8 MWh/yr and cost saving is $390206/yr the annual fan energy saving is 3892.8 MWh/yr and cost saving is $420206/yr the annual fan energy saving is 3792.8 MWh/yr and cost saving is $410206/yr

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