张振迎,杨建军,郝佳伟,高尚萱
ZHANG Zhenying,YANG Jianjun,HAO Jiawei,GAO Shangxuan

• 1:华北理工大学建筑工程学院

摘要(Abstract)：

对双温蒸发压缩/引射CO_2热泵系统进行了热力学分析,分析了气体冷却器出口温度、高低温蒸发器温度对引射系数、压力提升比、系统COP的影响和相对传统双温蒸发系统的COP提升情况。结果表明,随着气体冷却器出口温度升高,引射系数增加,压力提升比不变,COP逐渐下降;随着低温蒸发器蒸发温度升高,引射系数增加,压力提升比下降,COP几乎不变;随着高温蒸发器蒸发温度升高,引射系数下降,压力提升比上升,COP增加;在相同的工况下,压缩/引射系统的COP相对于传统双温蒸发系统的COP提升率范围为3.7%～18.8%。气体冷却器出口温度越高,低温蒸发器蒸发温度越低,高温蒸发器蒸发温度越高,压缩/引射系统的COP相对于传统双温蒸发系统的COP提升效果越明显。
The thermodynamic analysis of the dual-temperature evaporation compression/ejection CO_2 heat pump system was carried out.The influence of the gas cooler outlet temperature，the low and the high evaporation temperature on the entrainment ratio，the pressure lift ratio，the system COP and the COP improvement compared to traditional dual-temperature evaporation system were analyzed.The results show that as the gas cooler outlet temperature increases，the entrainment ratio increases，the pressure lift ratio remains unchanged，and the COP gradually decreases.As the low evaporation temperature of the evaporator increases，the entrainment ratio increases，the pressure lift ratio decreases，and the COP is almost constant.As the evaporation temperature of the high temperature evaporator increases，the entrainment ratio decreases，the pressure lift ratio increases，and the COP increases.Under the same working conditions，the COP of the compression/ejection system is increased by 3.7%～18.8% compared with the traditional dual-temperature evaporation system.The COP improvement of the compression/ejection system compared with the traditional dual-temperature evaporation system becomes more obvious at higher gas cooler outlet temperature，lower evaporation temperature of the low-temperature evaporator，and higher evaporation temperature of the high-temperature evaporator.

关键词(KeyWords)： 热泵;CO_2;双蒸发器;引射器
heat pump;CO_2;dual-evaporator;ejector

Abstract:

Keywords:

基金项目(Foundation): 河北省自然科学基金资助项目（E2020209121）;; 河北省省级科技计划资助项目（20474501D）

作者(Author): 张振迎,杨建军,郝佳伟,高尚萱
ZHANG Zhenying,YANG Jianjun,HAO Jiawei,GAO Shangxuan

参考文献(References)：

• [1]ZHANG Z，FENG X，TIAN D，et al.Progress in ejector-expansion vapor compression refrigeration and heat pump systems[J].Energy Conversion and Management，2020，207(3)：112529.
• [2]DISAWAS S，WONGWISES S.Experimental investigation on the performance of the refrigeration cycle using a two-phase ejector as an expansion device[J].International Journal of Refrigeration，2004，27(6)：587-594.
• [3]LEE J S，KIM M S，KIM M S.Experimental study on the improvement of CO2 air conditioning system performance using an ejector[J].International Journal of Refrigeration，2011，34(7)：1614-1625.
• [4]LIU F，LI Y，GROLL E A.Performance enhancement of CO2 air conditioner with a controllable ejector[J].International Journal of Refrigeration，2012，35(6)：1604-1616.
• [5]AHAMMED M E，BHATTACHARYYA S，RAMGOPAL M.Thermodynamic design and simulation of a CO2 based transcritical vapour compression refrigeration system with an ejector[J].International Journal of Refrigeration，2014，45(5)：177-188.
• [6]张振迎，王洪利，李敏霞，等.跨临界CO2蒸气压缩-引射热泵系统的性能分析[J].低温与超导，2014，42(9)：55-59.ZHANG Z Y，WANG H L，LI M X，et al.Performance analysis of transcritical CO2 vapor compression-ejection heat pump system[J].Cryogenics & Superconductivity，2014，42(9)：55-59.
• [7]OSHITANI H，YAMANAKA Y，TAKEUCHI H，et al.Vapor compression cycle having ejector[P].U.S.Patent No.7，254，961.2007-8-14.
• [8]LAWRENCE N，ELBEL S.Theoretical and practical comparison of two-phase ejector refrigeration cycles including first and second law analysis[J].International Journal of Refrigeration，2013，36(4)：1220-1232.
• [9]LAWRENCE N，ELBEL S.Experimental investigation of a two-phase ejector cycle suitable for use with low-pressure refrigerants R134a and R1234yf[J].International Journal of Refrigeration，2014，38(2)：310-322.
• [10]BOUMARAF L，HABERSCHILL P，LALLEMAND A.Investigation of a novel ejector expansion refrigeration system using the working fluid R134a and its potential substitute R1234yf[J].International Journal of Refrigeration，2014，45(5)：148-159.
• [11]?ABAN üNAL.Determination of the ejector dimensions of a bus air-conditioning system using analytical and numerical methods[J].Applied Thermal Engineering，2015，90(11)：110-119.
• [12]WANG X，YU J.Experimental investigation on two-phase driven ejector performance in a novel ejector enhanced refrigeration system[J].Energy Conversion and Management，2016，111(5)：391-400.
• [13]ZHANG Z，TIAN L.Effect of suction nozzle pressure drop on the performance of an ejector-expansion transcritical CO2 refrigeration cycle[J].Entropy，2014，16(8)：4309-4321.
• [14]LIAO S M，ZHAO T S，JAKOBSEN A.A correlation of optimal heat rejection pressures in transcritical carbon dioxide cycles[J].Applied Thermal Engineering，2000，20(9)：831-841.
• [15]LAWRENCE N.Analytical and experimental investigation of two-phase ejector cycles using low-pressure refrigerants[D].University of Illinois，Urbana，IL，USA，2012.