유기랭킨사이클을 이용한 병렬 열병합 발전시스템의 열역학적 이론 성능 특성
Theoretical Characteristics of Thermodynamic Performance of Combined Heat and Power Generation with Parallel Circuit using Organic Rankine Cycle
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Inthisstudyanovelcogenerationsystem drivenbylow-temperaturesourcesatatemperaturelevelbelow 190℃isinvestigatedbyfirstandsecondlawsofthermodynamics.Thesystem consistsofOrganicRankineCycle(ORC)and an additionalheatgeneration as a parallelcircuit.Seven working fluids ofR143a,R22,R134a,R152a,iC4H10(isobutane),C4H10(butane),andR123aareconsideredinthiswork.Maximum massflow rateofaworking fluidrelativetothatofthesourcefluidandoptimum turbineinletpressureareconsideredtoextractmaximum powerfrom thesource.Resultsshow thatduetoacombinedheatandpowergeneration,boththeefficienciesby firstandsecondlawscanbesignificantlyincreasedincomparisontoapowergeneration,however,thesecondlaw efficiencyismoreresonableintheinvestigationofcogenerationsystems.Resultsalsoshow thattheworkingfluid forthemaximum system efficiencydependsonthesourcetemperature.
Abstract
Inthisstudyanovelcogenerationsystem drivenbylow-temperaturesourcesatatemperaturelevelbelow 190℃isinvestigatedbyfirstandsecondlawsofthermodynamics.Thesystem consistsofOrganicRankineCycle(ORC)and an additionalheatgeneration as a parallelcircuit.Seven working fluids ofR143a,R22,R134a,R152a,iC4H10(isobutane),C4H10(butane),andR123aareconsideredinthiswork.Maximum massflow rateofaworking fluidrelativetothatofthesourcefluidandoptimum turbineinletpressureareconsideredtoextractmaximum powerfrom thesource.Resultsshow thatduetoacombinedheatandpowergeneration,boththeefficienciesby firstandsecondlawscanbesignificantlyincreasedincomparisontoapowergeneration,however,thesecondlaw efficiencyismoreresonableintheinvestigationofcogenerationsystems.Resultsalsoshow thattheworkingfluid forthemaximum system efficiencydependsonthesourcetemperature.
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