Transcription of UNIT 4 REFRIGERANTS - IGNOU
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UNIT 4 REFRIGERANTS - IGNOU
unit 4 REFRIGERANTS Structure Introduction Objectives Primary and Secondary REFRIGERANTS Classification of REFRIGERANTS Designation of REFRIGERANTS Desirable Properties of REFRIGERANTS Thermodynamic Properties Chemical Properties Physical Properties Safety Criteria Economic Criteria Common REFRIGERANTS Ozone Depletion Potential and Global Warming Potential Secondary REFRIGERANTS Illustrative Problems Summary Answers to SAQs INTRODUCTION The working agent in a refrigerating system that absorbs carries or releases heat from the place to be cooled or refrigerated can be termed as a refrigerant . This heat transfer generally takes place through a phase change of the refrigerant . A more complete definition of a refrigerant could be given as follows: refrigerant is the fluid used for heat transfer in a refrigerating system that absorbs heat during evaporation from the region of low temperature and pressure, and releases heat during condensation at a region of higher temperature and pressure.
57 4.5 DESIRABLE PROPERTIES OF REFRIGERANTS Refrigerants The vast number of refrigerants available in the market today allows us to choose a refrigerant depending upon the operating conditions of the refrigeration system.
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