Transcription of MULTI-STAGE VAPOUR COMPRESSION REFRIGERATION …
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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. Multi-stagesystemsarealsousedinapplicati onsrequiringrefrigerationatdifferenttemp eratures. Forexample,inadairyplantrefrigerationmay berequiredat 30oCformakingicecreamandat2oCforchilling milk.
refrigerant consists of 3 evaporators of capacities 30 TR, 20 TR and 10 TR with individual expansion valves and compressors. The temperature in the 3 evaporators is to be maintained at -100C, 50C and 100C respectively. The vapor leaving the evaporator is dry and saturated. The condenser temperature is 400C and the liquid refrigerant leaving the ...
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