流体机械
流體機械
류체궤계
FLUID MACHINERY
2014年
12期
68-72
,共5页
两级压缩%热泵%中高温%理论分析
兩級壓縮%熱泵%中高溫%理論分析
량급압축%열빙%중고온%이론분석
two-stage compression%heat pump%moderately high temperature%theoretical analysis
中高温热泵系统中在工业领域有广泛的应用，但其排气温度偏高。本文从降低压缩机排气温度角度，设计一种双级压缩新型热泵系统。系统由高低级压缩机、分凝器、两个节流机构等组成。以循环性能较好的两种工质 R134a 和R152a 为系统循环工质，理论分析结果表明：在中高温工况下，新系统工质 R152a 循环性能系数 COP 优于 R134a，在相同工况下工质 R152a 循环性能 COP 比 R134a 高7％～8％；高温级压缩机排气温度均随中间压比的升高而降低；排气温度与传统单级压缩系统相比有3～12℃的降幅。
中高溫熱泵繫統中在工業領域有廣汎的應用，但其排氣溫度偏高。本文從降低壓縮機排氣溫度角度，設計一種雙級壓縮新型熱泵繫統。繫統由高低級壓縮機、分凝器、兩箇節流機構等組成。以循環性能較好的兩種工質 R134a 和R152a 為繫統循環工質，理論分析結果錶明：在中高溫工況下，新繫統工質 R152a 循環性能繫數 COP 優于 R134a，在相同工況下工質 R152a 循環性能 COP 比 R134a 高7％～8％；高溫級壓縮機排氣溫度均隨中間壓比的升高而降低；排氣溫度與傳統單級壓縮繫統相比有3～12℃的降幅。
중고온열빙계통중재공업영역유엄범적응용，단기배기온도편고。본문종강저압축궤배기온도각도，설계일충쌍급압축신형열빙계통。계통유고저급압축궤、분응기、량개절류궤구등조성。이순배성능교호적량충공질 R134a 화R152a 위계통순배공질，이론분석결과표명：재중고온공황하，신계통공질 R152a 순배성능계수 COP 우우 R134a，재상동공황하공질 R152a 순배성능 COP 비 R134a 고7％～8％；고온급압축궤배기온도균수중간압비적승고이강저；배기온도여전통단급압축계통상비유3～12℃적강폭。
Moderately high temperature heat pump system has been widely used in industry,but high compressor discharge temperature is a problem.This paper designed a new kind of two-stage moderately high temperature heat pump system,which con-sists of two compressors,two condensers,two throttles etc.HFCs refrigerant R134a and R152a are used as working fluids.The the-oretical analysis showed that,the coefficient performance of R152a increases 7% ~8% than that of R134a at studying intermedi-ate pressure ratio in moderately high temperature heat pump situation;the compressor discharge temperature declines with the in-termediate pressure ratio increases;the discharge temperature of new system decreases3℃ ~12℃comparing to the one-stage com-pression system.
