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 iscondensed at 10°C. Find the C.O.P. if (i) there is no under cooling (ii) the liquid is cooled by 5°C before expansionby throttling.Take specific heat at constant pressure for the superheated vapour as 0.64KJ/kg k. and that for liquid as0.94KJ/kg k the other properties of refrigerant are as follow:a) Temperatureb) 0°Сс) Enthalpy(KЈK))d) Entropy(KJ/kg k)e) liquid_j) 22.30) 45.4f) Vapourk) 180.88g) liquid1) 0.09049) 0.1750h) Vapourm) 0.7051i) -15n) 10p) 191.76r) 0.6921

C . O . P of the system C .O . P = h1 - h6h2 - h1 Enthalpy h1 = 180.88 KJ/kg As the…

Answered: igeration is refrigera L0.P. if (i) th…

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

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

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 30RQ: A gas is compressed inside a compressor's cylinder. When the piston is at its bottom dead center,...

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Question

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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