18.Ideal Vapor Compression Cycle Problem|Refrigeration in Urdu/Hindi

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Ideal Vapor Compression Cycle Problem
In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor at state 1 as saturated vapor(-10C,0.14Mpa) and is compressed isentropically to the condenser pressure(0.8Mpa,50C). The temperature of the refrigerant increases during this isentropic compression process to well above the temperature of the surrounding medium. The refrigerant then enters the condenser as superheated vapor at state 2 and leaves as a saturated liquid at state 3 as a result of heat rejection to the surroundings(26C,0.8Mpa). The temperature of the refrigerant in this state is still above the temperature of the surroundings.

The saturated liquid refrigerant at state 3 is throttled to the evaporator pressure(0.14Mpa) by passing it through an expansion valve or capillary tube. The temperature of the refrigerant drops below the temperature of the refrigerated space during this process(-10C). The refrigerant enters the evaporator at state 4 as a low-quality saturated mixture, and it completely evaporates by
absorbing heat from the refrigerated space. The refrigerant leaves the evaporator as saturated vapor and reenters the compressor, completing the cycle. (-10C,0.14Mpa).

In this video, schematic representation and working of the Vapour Compression cycle with the help of the Ts diagram have been explained.

Physical problems make the idea very much clear and help to understand concepts in a better way. In this video, the following problem has been worked out.

A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.14 and 0.8 MPa. If the mass flow rate of the refrigerant is 0.05 kg/s, determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the COP of the refrigerator.
Reference: Thermodynamics an Engineering Approach by Yunus A Cengel

Understanding the Problem 00:03
Schematic and Ts diagram of VCC 01:01
Rate of heat removal from the refrigerated space 02:31
Power input to the compressor 03:40
Rate of heat rejection to environment 04:36
Coefficient of performance of the refrigerator 05:00

#IdealVaporCompressionCycleProblem#compressionrefrigerationsystem#vaporcompressioncyclediagram
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