Question

Wac (elec) The diagram depicts a portion of a DX air-conditioning system that provides cooling to one zone in a building. The outdoor unit provides heat-rejection and includes the compressor and the condenser fan. The indoor-fan moves air from the conditioned zone, across the cooling coil, and then back to the conditioned zone. The indoor-fan (with directly coupled motor) is located within the air-stream. Electric power consumption of the indoor fan motor is denoted Wm. The electrical power supply for the system is single-phase, 220 VAMS, 60 hz. ec At a particular moment, the cooling-coil provides a cooling rate = 26,500 btu/hr with the air-conditioner unit operating at COP = 3.2. Wym (elec) (Coversion: 3.412 btu/hr = 1 W) ac a) Estimate the electric input power required by the outdoor unit, W. b) Estimate the electric current required by the outdoor unit (amps; RMS) if it operates with power-factor = 0.85.

Answer 1

Qa = 26.500 Btulby = 7766 out hi a) electric input Power required Ga 11 COP Wae #466. # 2427. I blatt 11 3.2 b) Inms Power 19 2427.) Vams x Power Suchor 220x0.85 Icons 12.98 amps (current required). ams