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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

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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