An air conditioner mounted in a window supplies cold air at a temperature of 15oC and a pressure of 1 bar into a bedroom. The flow rate of air is 20 m3 /min. The air conditioner operates at steady state in a typical refrigeration cycle using Refrigerant 134a entering the compressor at 4 bar and 10oC. The condenser operates at 10 bar. The compressor has an

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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Question

An air conditioner mounted in a window supplies cold air at a temperature of 15oC and a
pressure of 1 bar into a bedroom. The flow rate of air is 20 m3
/min. The air conditioner
operates at steady state in a typical refrigeration cycle using Refrigerant 134a entering the
compressor at 4 bar and 10oC. The condenser operates at 10 bar. The compressor has an
isentropic efficiency of 75%. The air returns from the bedroom to the evaporator of the air
conditioner unit at a temperature of 23oC. Calculate:
a. The power required by the compressor, in kW.
b. The coefficient of performance of the cycle.

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give answer all questions with explanation.
6. An ammonia vapour-compression refrigerator operates between an evaporator pressure of 2.077 bar and a condenser pressure of 12.37 bar. The following cycles are to be compared ; in each case there is no undercooling in the condenser, and isentropic compression may be assumed : (i) The vapour has a dryness fraction of 0.9 at entry to the compressor. (ii) The vapour is dry saturated at entry to the compressor. (iii) The vapour has 5 K of superheat at entry to the compressor. In each case calculate the C.O.P.t) and the refrigerating effect per kg. What would be the C.O.P.t, of a reversed Carnot cycle operating between the same saturation tempera- tures ? *(ref.) [Ans. 4.5 ; 957.5 kJ/kg ; 4.13 ; 1089.9 kJ/kg ; 4.1 ; 1101.4 kJ/kg]
Need help with parts f, g, and h