ASHRAE.4618-2003 Impact of Operating Hours on Long-Term Heat Storage

《ASHRAE.4618-2003 Impact of Operating Hours on Long-Term Heat Storage 》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、4618ImpactofOperatingHoursonLong-TermHeatStorageandtheDesignofGroundHeatExchangersStephenP.Kavanaugh,Ph.D.MemberASHRAEABSTRACTsignificantamountofseasonalheatimbalanceoccursingeologicalformationsthattendtostoreheat,designersmustThedesignofverticalground-coupledh

2、eatpump(GCHP)compensatewithoneormoreofthefollowingpractices:systemsrequiresanaccountingoftheamountofheatrejectedincreasingverticalbore-to-boreseparationdistance,increas-andextractedoveranextendedperiod.ASHRAE1120-TRPinglengths,and,insomecases,addingfluidcoolers

3、.Todeter-revisedtheconceptofequivalentfull-loadhours(EFLHs)asminetheextentofthisimbalance,anestimationofthebuildinganalternativetoamoreelaborateenergyanalysis.Thispaperheatingandcoolingenergyrequirementmustbegenerated.appliesresultsofthisprojecttostudytheimpact

4、oftherecom-Asanalternativetobuildingenergysimulations,mendedvalueswithover-andunderestimatedEFLHsinthreeASHRAE1120-TRP(CDHandTESS2000)undertooktheclimatesforthreedifferentbuildingtypes.taskofenhancingandexpandingtheconceptofequivalentResultsindicatetherequiredd

5、esignlengthforaverticalfull-loadhours(EFLHs)toreducethetimerequiredtoGCHPsystemcanbesubstantiallyaffectedbytheannualperformaccurateGCHPsystemdesign.Thisconceptlastimbalanceofheatrejectedtoandabsorbedfromthegroundinappearedinthe1985ASHRAEHandbook—Fundamentalsinn

6、onporousformations.Theimpactisreducedforporoustheformofatablewithalimitednumberoflocations,eachformations.OverestimationoftheannualcoolingenergybywithabroadrangeofcoolingEFLHsandnocorrelationto50%resultedinincreasesinrequiredlengthsof4%to15%forbuildingtypesoroc

7、cupancyschedules.ASHRAE1120-TRPnonporousformations.OverestimationoftheannualheatinggeneratedEFLHsforbothcoolingandheatingfor35locationsenergyby50%resultedina13%increaseinrequiredlengthintheUSAandfourbuildingtypes(nine-monthschools,45inMinneapolisandminimalchang

8、einSt.LouisandAtlanta.hoursperweekoffices,98hoursperweekretail,andcontin-Theimpactofbore-to-boreseparationinnonporousforma-uousoperation).Whilethismethodisrecognizedaslessac