부하변동에 의한 지중유효열전도도와 보어홀 전열저항 해석
Analysis of Effective Soil Thermal Conductivities and Borehole Thermal Resistances with a Power Supply Regulation
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초록
Investigationoftheeffectivesoilthermalconductivity()isthefirststepindesigning thegroundloopheat exchanger(borehole)ofa geothermalheatpump system.Anotherimportantfactoris the borehole thermal resistance().Thermalresponsetestsofferagoodmethodtodeterminethegroundthermalpropertiesforthetotal heattransportintheground.Thisisdonebysupplyingaconstantheatpowerintoaboreholeheatexchanger. Therearetwomethodstosupply aconstantheatpower.Oneistoemploy theelectricity providedby Korea ElectricPowerCorporation(KEPCO).Theotheristouseelectricitygeneratedbyagenerator.Inthisstudy,the powersupplyregulationwasfoundtoreducewhentheelectricitygeneratedbythegeneratorwasused.Thisis becausethegeneratorevaluatedwith thepowersupply characteristically reducesthepowersupply regulation betweenanoverloadandacomplexusing.ButitsometimesoccursapowersupplyregulationinIn-situthermal responsetest.Inthiscasegettingof, requiresdelaytimesandrestorednormalstate.However,theeffect ofthedelaytimesandrestorednormalstateonthesoilthermalconductivityandboreholethermalresistanceis very small.Thereforeitispossibletouseagenerally accepteddelay timesandrestorednormalstatein the analysis.Inthiswork,itisalsoshownthatanacceptablerangeof, fornormalstateandregulationstate mightbeapproximately 0.01-0.16,and-0.004-0.007,respectively.Thus,restored normalstateof powersupplyregulationisvaluabletorecommend.
Abstract
Investigationoftheeffectivesoilthermalconductivity()isthefirststepindesigning thegroundloopheat exchanger(borehole)ofa geothermalheatpump system.Anotherimportantfactoris the borehole thermal resistance().Thermalresponsetestsofferagoodmethodtodeterminethegroundthermalpropertiesforthetotal heattransportintheground.Thisisdonebysupplyingaconstantheatpowerintoaboreholeheatexchanger. Therearetwomethodstosupply aconstantheatpower.Oneistoemploy theelectricity providedby Korea ElectricPowerCorporation(KEPCO).Theotheristouseelectricitygeneratedbyagenerator.Inthisstudy,the powersupplyregulationwasfoundtoreducewhentheelectricitygeneratedbythegeneratorwasused.Thisis becausethegeneratorevaluatedwith thepowersupply characteristically reducesthepowersupply regulation betweenanoverloadandacomplexusing.ButitsometimesoccursapowersupplyregulationinIn-situthermal responsetest.Inthiscasegettingof, requiresdelaytimesandrestorednormalstate.However,theeffect ofthedelaytimesandrestorednormalstateonthesoilthermalconductivityandboreholethermalresistanceis very small.Thereforeitispossibletouseagenerally accepteddelay timesandrestorednormalstatein the analysis.Inthiswork,itisalsoshownthatanacceptablerangeof, fornormalstateandregulationstate mightbeapproximately 0.01-0.16,and-0.004-0.007,respectively.Thus,restored normalstateof powersupplyregulationisvaluabletorecommend.
참고문헌 (12)
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