ASHRAE Handbook98.R41 ABSORPTION COOLING, HEATING, AND REFRIGERATION EQUIPMENT

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1、CHAPTER41ABSORPTIONCOOLING,HEATING,ANDREFRIGERATIONEQUIPMENTTerminology............................................................................41.1Ammonia-Water-HydrogenCycle...........................................41.9BasicCycles...................................................

2、.........................41.2SpecialApplications..............................................................41.11Water-LithiumBromideAbsorptionTechnology....................41.2EvolvingConcepts.................................................................41.11Ammonia-WaterAbsorptio

3、nTechnology................................41.9AlternativeAbsorptionWorkingFluids................................41.12THISchapterdescribesboththestandardabsorptioncoolingConcentrated(strong)solution.Solutionwitharelativelyhighandheatingunitsavailableandnewconceptsthatareevolving.massfra

4、ctionofsorbent,and,accordingly,arelativelylowmassAbsorptionunitsofferseveraladvantages.Theyreducetheuseoffractionofrefrigerant.CFCrefrigerantsandeliminateconcernsaboutlubricantsinrefrig-Condensation.Liquefactionoftherefrigerantvaporcausedwheniterants.Inaddition,particularlywithdirect-fi

5、redsystems,theylevelgivesupanysuperheat(ifpresent)anditslatentheattoanavailablethedemandfornaturalgasyear-round,whichpromotesefficientheatsink.maintenanceofpipelinesystemsandlowerscosts.Crystallization.ThefreezingorconversionofthepumpableliquidRefrigerationwithabsorptionispossibleatevap

6、oratortempera-solutionintoasolidorslushymasswhenitisexcessivelystronginturesrangingfrom50°Ftoaslowas–75°Fwithavarietyofcyclessorbentatagiventemperature.Notallsolutionsexperiencethisandfluids.Forheatpumpsandheattransformers,evaporatorfluidproblem;water-lithiumbromidedoesbutammonia-waterd

7、oesnot,inlettemperaturescaneasilyreach212°F.exceptatverylowtemperatures.Absorptionequipment,whichisheatdriven,canbothcoolandheatforhumancomfortandprocesscontrol.Heatsourcesfordriv-Desorption(generation).Theprocessinwhichheatisaddedtoainganabsorptionunitincludethefollowing:dilut