# a room is cooled by circulating chilled water

A room is cooled by circulating chilled water through a heat exchanger located in a room. The air is circulated through the heat exchanger by a 0.25-hp (shaft output) fan. Typical efficiency of small electric motors driving 0.25-hp equipment is 54 percent. Determine the rate of heat supply by the fan–motor assembly to the room.

Given Data: Shaft Out Put Pout = 0.25 hp Efficiency of the electric motor = 54% = 0.54 Solution: The electric power consumed by the electric motor will be converted to the rate of heat supply tot he room here. Therefore, this rate of heat can be given as: (dot…
r eta=0.25over0.54=0.463:hp) Now 1 hp = 746 W, So 0.463 hp = 0.463*746 W = 345.37 W Therefore, the rate of heat supply by the fan–motor assembly to the room = 345.37 W
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