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…

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

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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The evaporator of a refrigeration system is to be maintained at-12°C.If degree superheat is 7℃, find the temperature of refrigerant entering the compressor.
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Note : Use the relevant chart for each problem 3. A vapour compression refrigerator uses R-12 as 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 coefficient of performance if (i) there is no undercooling , and (ii) the liquid is cooled by 5°C before expansion by throttling. Take specific heat at constant pressure for the superheated vapour as 0.64 kJ/kg.K and for liquid as 0.94 kJ/kg.K. (Same as Example 12) Please solve the question on a piece of paper and using tables with illustrations
please answer all and with complete solutions. thank you.
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