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igeration is refrigera L0.P. if (i) th constant pre

igeration is refrigera L0.P. if (i) th constant pre

Elements Of Electromagnetics
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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Q1. A vapour compression refrigeration uses R-12 as a refrigerant and the liquid evaporates in the evaporator at - 15°C. The temperature of this refrigerant at the delivery from the compressor is 15°C when the vapour is condensed at 10°C. Find the C.O.P. if (i) there is no under cooling (ii) the liquid is cooled by 5°C before expansion by throttling. Take specific heat at constant pressure for the superheated vapour as 0.64KJ/kg k. and that for liquid as 0.94KJ/kg k the other properties of refrigerant are as follow: a) Temperature b) 0°С с) Enthalpy(KЈK)) d) Entropy(KJ/kg k) e) liquid _j) 22.3 0) 45.4 f) Vapour k) 180.88 g) liquid 1) 0.0904 9) 0.1750 h) Vapour m) 0.7051 i) -15 n) 10 p) 191.76 r) 0.6921
Transcribed Image Text:Q1. A vapour compression refrigeration uses R-12 as a refrigerant and the liquid evaporates in the evaporator at - 15°C. The temperature of this refrigerant at the delivery from the compressor is 15°C when the vapour is condensed at 10°C. Find the C.O.P. if (i) there is no under cooling (ii) the liquid is cooled by 5°C before expansion by throttling. Take specific heat at constant pressure for the superheated vapour as 0.64KJ/kg k. and that for liquid as 0.94KJ/kg k the other properties of refrigerant are as follow: a) Temperature b) 0°С с) Enthalpy(KЈK)) d) Entropy(KJ/kg k) e) liquid _j) 22.3 0) 45.4 f) Vapour k) 180.88 g) liquid 1) 0.0904 9) 0.1750 h) Vapour m) 0.7051 i) -15 n) 10 p) 191.76 r) 0.6921
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