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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 ne 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 iref

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 ne 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 iref

Refrigeration and Air Conditioning Technology (MindTap Course List)
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
Chapter22: Condensers
Section: Chapter Questions
Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...
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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]
Transcribed Image Text: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]
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