A window-mounted air conditioner supplies 19 m3/min of air at 15°C, 1 bar to a room. Air returns from the room to the evaporator of the unit at 22°C. The air conditioner operates at steady state on a vapor-compression refrigeration cycle with Refrigerant 22 entering the compressor at 4 bar, 10°C. Saturated liquid refrigerant at 14 bar leaves the condenser. The compressor has an isentropic efficiency of 70%, and refrigerant exits the compressor at 14 bar. Determine: (a) the compressor power, in kW. (b) the refrigeration capacity, in tons.

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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A window-mounted air conditioner supplies 19 m3/min of air at 15°C, 1 bar to a room. Air returns from the room to the evaporator of the unit at 22°C. The air conditioner operates at steady state on a vapor-compression refrigeration cycle with Refrigerant 22 entering the compressor at 4 bar, 10°C. Saturated liquid refrigerant at 14 bar leaves the condenser. The compressor has an isentropic efficiency of 70%, and refrigerant exits the compressor at 14 bar.


Determine:

(a) the compressor power, in kW.

(b) the refrigeration capacity, in tons.

(c) the coefficient of performance.

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