毕业外文翻译-集中供热和制冷设备的选择名师资料合集（完整版）资料(可以直接使用，可编辑优秀版资料，欢迎下载）CENRTRALCOOLINGANDHEATINGTheenergyusedtoheatandcoolmanybuildingsoftencomesfromacentrallocationinthefacility.Theenergyinputmaybecombinationofelectricity,oil,gas,coal,solar,geothermal,etc.Thisenergyistypicallyconvertedintohotorchilledwaterorsteamthatisdistributedthroughoutthefacilityforheatingandairconditioning(cooling).Centralizingthisfunctionkeepstheconversionequipmentinonelocationanddistributestheheatingandcoolinginamorereadilyusableform.Also,acentralcoolingandheatingplantprovideshigherdiversityandgenerallyoperatesmoreefficientlywithlowercentrallocationandapotentiallylargedistributionsystem.Thislessonaddressesthedesignalternativesthatshouldbeconsideredwhencentralizingthecoolingandheatingsourcesinafacility.Theeconomicsofthesesystemsrequireextensiveanalysis.Boilers,gas,steam,andelectricturbine-drivencentrifugalrefrigerationunits;andabsorptionchillersmaybeinstalledincombinationinoneplant.Inlargebuildingswithcoreareasthatrequirecoolingandperimeterareasrequireheating,oneofseveralheatreclaimsystemsmayheattheperimetertosaveenergy.Thechoiceofequipmentforacentralheatingandcoolingplantdependsonthefollowing:RequiredcapacityandtypeofuseCostandtypesofenergyavailableLocationandspacefortheequipmentroomAstackforanyexhaustgasesanditsenvironmentimpact\SafetyrequirementsforthemechanicalroomandsurroundingareasTypeofairdistributionsystemOwningandoperatingcostsManyelectricutilitiesimposeveryhighchargesforpeakpoweruseor,alternatively,offerincentivesforoff-peakuse.Thispolicyhasrenewedinterestinbothwaterandicethermalstorage.Thestoragecapacityinstalledforsummerloadlevelingmayalsobeavailableforuseinthewinter,makingheatreclaimamoreviableoption.Withicestorage,thelow-temperatureicewatercanprovidecolderairthanthatavailablefromaconventionalsystemthatsuppliesairat10to13℃.Theuseofahigherwatertemperatureriseandalowersupplyairtemperature,lowerstherequiredpumpingandfanenergyand,insomeinstances,offsetstheenergypenaltyduetothelo