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MULTI-STAGE VAPOUR COMPRESSION REFRIGERATION …

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. Atwo-stagesystemisusedupto 60oCand Athree-stagesystemisusedfortemperaturesb elow 60oC.

•A multi-stage system is a refrigeration system with two or more low-side pressures. •Multi-stage systems can be classified into: a) Multi-compression systems b) Multi-evaporator systems c) Cascade systems, etc. •Two concepts which are normally integral to multi-pressure systems are, i) flash gas removal, and ii) intercooling.

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