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Refrigeration and Air Conditioning

by Manoj Kumar RoutManoj Kumar Rout
Type: PracticalInstitute: Biju Patnaik University of Technology BPUT Specialization: Mechanical EngineeringOffline Downloads: 27Views: 1168Uploaded: 1 year ago

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Manoj Kumar Rout
Manoj Kumar Rout
LABORATORY MANUAL RAC LAB DEPARTMENT OF MECHANICAL ENGINEERING Prepared By Er. Manoj Kumar Rout Asst. Professor Prepared By Er. Manoj Kumar Rout Page 1
CONTENTS Sl Experiment No 1 Determination of C.O.P. on Vapour Compression System 2 Determination of C.O.P. on Vapour Absorption System 3 Determination of C.O.P. on Heat Pump 4 Performance Test on Air Conditioning Test Rig (Duct Type) 5 Performance Analysis in an Experimental cooling Tower Prepared By Er. Manoj Kumar Rout Date of Date of Page Remarks Expt submission No. Page 2
Experiment No: VAPOUR COPRESSION TEST AIM OF THE EXPERIMENT: Determination of COP actual & COP theoretical of vapour compression refrigeration system. APPARATUS REQUIRED: 1.Vapour compression refrigeration test rig. 2. Stop watch. THEORY: A vapour compression refrigeration system is improved type of refrigeration system in which suitable working substance termed as refrigerant is used, it condensates and evaporates at temperature and pressure close to atmospheric conditions. The refrigerants used for this purpose are ammonia, carbon dioxide, and sulphur dioxide. The refrigerant used does not leave the system, alternatively condensing and evaporating. In evaporation, the refrigerant absorbs it’s latent heat from which it is used for circulating it around the cold chamber while cost during it gives latent heat to the circulating water of the cooler. The VCS is thus latent heat pump as it pumps its latent heat from brine end and delivers it to the cooler. It is generally used for all individual purposes from small domestic refrigerator to a big air conditioning plant. ADVANTAGES: 1. It has similar size for given capacity of refrigerator. 2. It has less running cost. 3. It is employed for large range of temperature. 4. The COP is quite higher. DISADVANTAGES: 1. The initial cost is higher. Prepared By Er. Manoj Kumar Rout Page 3
2. The leakage of refrigerant is difficult to avoid. ESSENTIAL PARTS OF THE SYSTEM: Compressor: The low pressure and temperature of the vapour refrigerant from evaporator is drawn into the compressor through IV or suction valve where it is compressed to high pressure and temperature. Refrigerant is discharged into the condenser through delivery or discharge valve. Condenser It consists of coils of pipe in which high pressure and temperature vapour refrigerant gets cooled and condensed. The refrigerant while running through the condenser gives up its latent heat to the surrounding condensing medium which is normally air or water. Receiver The condensed liquid refrigerant from the condenser is stored in vessel known as receiver from where it is supplied to the evaporator through the expansion valve. Expansion Valve: It allows the liquid refrigerant under high pressure and temperature to pass at a controlled rate after reducing its pressure and temperature. Some of the refrigerants evaporate and pass through expansion valve but their greater portion is vaporized in the evaporator at low pressures and temperatures. Evaporator: It consists of coils of pipe in which the liquid refrigerant at low pressure and temperature. In evaporation, the liquid vapour refrigerant absorbs its latent heat of vaporization from the medium which is to be cooled. ANALYSIS OF VAPOUR COMPRESSION SYSTEM: The standard Vapour Compress Cycle consists of the following processes. 1-2 Reversible adiabatic compression from saturated vapour to the condenser pressure. 2-3 Reversible heat rejection at constant pressure de-superheating and condensation. 3-4 Irreversible constant enthalpy expansion from saturated liquid to the evaporator pressure. Prepared By Er. Manoj Kumar Rout Page 4

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