ASHRAE.HandBook_22-2008 AIR-COOLING AND DEHUMIDIFYING COILS

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1、RelatedCommercialResourcesCHAPTER22AIR-COOLINGANDDEHUMIDIFYINGCOILSUsesforCoils...........................................................................22.1PerformanceofSensibleCoolingCoils...................................22.7CoilConstructionandArrangement.....................

2、...................22.1PerformanceofDehumidifyingCoils.......................................22.9CoilSelection...........................................................................22.5DeterminingRefrigerationLoad............................................22.14AirflowResistan

3、ce...................................................................22.6Maintenance...........................................................................22.15HeatTransfer...........................................................................22.6Symbols...................

4、...............................................................22.16MOSTequipmentusedtodayforcoolinganddehumidifyinganFig.1TypicalWaterCircuitArrangementairstreamunderforcedconvectionincorporatesacoilsectionthatcontainsoneormorecoolingcoilsassembledinacoilbankarrangement.Suchcoils

5、ectionsareusedextensivelyascomponentsinroomterminalunits;largerfactory-assembled,self-containedairconditioners;centralstationairhandlers;andfieldbuilt-upsystems.Applicationsofeachcoiltypearelimitedtothefieldwithinwhichthecoilisrated.Otherlimitationsareimposedbycoderequire-ments,pr

6、operchoiceofmaterialsforthefluidsused,theconfigura-tionoftheairhandler,andeconomicanalysisofthepossiblealternativesforeachinstallation.USESFORCOILSCoilsareusedforaircoolingwithorwithoutaccompanyingdehumidification.Examplesofcoolingapplicationswithoutdehu-midificationare(1)precooli

7、ngcoilsthatusewellwaterorotherrel-ativelyhigh-temperaturewatertoreduceloadontherefrigeratingequipmentand(2)chilled-watercoilsthatremovesensibleheatfromFig.1TypicalWaterCircuitArrangementschemicalmoisture-absorptionapparatus.Theheatpipecoilisalsousedasasupplementaryheatexchangerfor

8、preconditioninginair-sidesensible