Working Model Of Refrigeration

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Recommended: Describe briefly the basic refrigeration cycle

CHAPTER: 1
INTRODUCTION
General What is Refrigeration? Refrigeration is the process of removing heat from a closed body or space enclosed so that its temperature is first lowered and then maintained at a required level which is below the temperature of surroundings.
What is Refrigerant? “It is heat carrying medium which absorb heat from space and reject heat to outside the refrigerator.”
A simple vapor compression refrigeration system consists of the following equipments: Compressor Condenser Expansion valve Evaporator.
Compressor: Function of compressor is removing the vapour from evaporator and increase the pressure & temperature up to condensed into the diffuser.
Condenser: Function of the condenser is
Geometry of diffuser

The cross-sectional area of diffuser should reduce in the flow direction for supersonic flows and should increase for subsonic flows. The velocity of refrigerant leaving the compressor is sub-sonic. Hence, cross-sectional area of diffuser should be increasing. components of vcr cycle

Fig.3.2. Working Model Of VCR Cycle
3.2.1) Compressor: FIG.3.2.1 Figure of compressor
CHAPTER: 4 METHODOLOGY
4.1.1) Compression process: the vapour refrigerant at low pressure and temperature is compressed isentropically to dry saturated vapour. The work done during isentropic compression per kg of refrigerant is wc= h2-h1 h1= enthalpy of vapour refrigerant at suction of the compressor. h2= enthalpy of vapour refrigerant at dischrage of the compressor.
4.1.2) Vaporising process: The liquid-vapour mixture of the refrigerant at pressure and temperature is evaporated and changed into vapour refrigerant at constant pressure and temperature. RE= h1-h4 h1= enthalpy of vapour refrigerant at suction of the compressor. h4= enthalpy of liquid refrigerant leaving the condenser. C.O.P= ( h1-h4)/( h2-h1 ) = (Refrigeration effect)/(Work

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