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ID:7943690
大小:3.41 MB
页数:36页
时间:2018-03-02
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1、HeatPumpsReducingOperatingCostsandEmissionsMutazYaghiJohnsonControls,Inc.1Agenda•Heatpumpbasics•Measuringperformance•Economics•Environmentalbenefits•Casestudies•Questions2HeatPumpBasics3BuildingCoolingLeavingCondenserWater@oo95F(35C)AHU-1AHU-2AHU-3ReturnChilledWater@oo54F(13C)Chille
2、rBuildingHeatingWaterSuppliedat110to180°F(40to80°C)BoilerWhatisaHeatPump?•HeatPumpisadevicewhich:–Primaryobjectiveistotransferheatfromalowtemperaturebodytoahightemperaturebody–Requiresworkinputintothecycle–Operatesinavapor–compressioncycle•AppliestoAirconditioners,WaterChillers,andR
3、efrigerationSystems•However,thetermHeatPumpisreservedforequipmentthatheatsforbeneficialpurposes.TransferstheheattoahigherHeatPumptemperaturesinkHeatpumpextractsheatSinkfromasourceAirWaterAirSourceWaterGroundSolarSource6TypesofHeatPumps•AirtoAir–Mostcommonisresidentialair-airheatpump
4、sthatcoolinsummerandheatinwinter•WatertoAir–Groundwaterheatpumps–Surfacewaterheatpumps•WatertoWater–Chilledwater–Coolingtowerwater–ProcessfluidWe’llfocus•Lowgradeheatfromaprocesssteamonthis•Wastewaterfromlaundry,sanitarywasteheat•etc7HeatRejectionBasicRefrigerationMotorCycleCompress
5、or95°F35°CEvaporatorCondenser85°F42°FWasted30°C5.5°CHeat8HeatPumpHeatPumpMotorCompressorAnysourceUptotemperature170°F/80°CEvaporatorHeatPumpCondenserHeatPumpsmoveheat100%UsefulHeatBoilerscreateheat9TheoryofaHeatPumpHeatPumpHeatRejectionHeatRejectedEvaporatorCoolingInputEnergy/Enthal
6、py10MeasuringPerformance11ChillerEfficiencyRatingsFullLoadunitskW/TonElectricalPowerInputkW=0.576kW/TonRefrigerationCapacityTonAtARIconditionstomeetASHRAE90.1FullLoadCoefficientofPerformance(COP)*coolingRefrigerationCapacitykW=6.1(unitless)ElectricalPowerInputkWToconvertfromkW/ton:C
7、OP=3.5168/kW/ton12PerformanceMeasurementCOP(CoefficientofPerformance)=UsefulworkInputworkInputworkThebiggerMotorthebetter!Chiller:0.35unitUsefulworkHeatPump:CompressorUsefulwork1unit1.35unitEvaporatorHeatPumpCondenserCoolingCOP=1.00/0.35=2.9HeatingCOP=1.35/0.35=3.8CombinedCOP=2.35/0
8、.35=6.713Economics1
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