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MULTI-STAGE VAPOUR COMPRESSION REFRIGERATION …

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MULTI-STAGE VAPOUR COMPRESSION REFRIGERATION SYSTEMS(VCR)WHY MULTI-STAGE ??? Theperformanceofsinglestagesystemsshowst hattheseareadequateaslongasthetemperatur edifferencebetweenevaporatorandcondenser (temperaturelift)issmall. Thetemperatureliftcanbecomelargeeitherdu etotherequirementofverylowevaporatortemp eraturesand/orduetotherequirementofveryh ighcondensingtemperatures. Forexample,infrozenfoodindustriestherequ iredevaporatorcanbeaslowas 40oC,whileinchemicalindustriestemperatur esaslowas 150oCmayberequiredforliquefactionofgases . Onthecondenserside,Refrigerationsystemis usedasaheatpumpforheatingapplicationssuc hasprocessheating, Forfluorocarbonandammoniabasedrefrigerat ionsystems: Singlestagesystemisuseduptoanevaporatort emperatureof 30oC.

Throttling losses increase 2. Superheat losses increase 3. Compressor discharge temperature increases 4. Quality of the vapour at the inlet to the ... using individual expansion valves for each evaporator. Assuming saturated conditions at the exit of evaporators and condenser and isentropic compression:

  Valves, Throttling

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