R245fa中高温热泵循环性能实验研究
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摘要
近年来,高温热泵机组广泛应用臭氧破坏势ODP为0、温室效应GWP较低的R245fa工质,为此,本文对机组的膨胀阀和水系统进行优化改进,并对R245fa过热度实现精确控制,而后在蒸发器侧平均水温为40～60℃的工况下进行实验。结果表明,在蒸发器侧平均水温60℃时,冷凝器侧出水温度最高可达105.8℃,此工况下的COP为2.701,此时排气温度和冷凝压力均较低,符合机组安全运行的要求。
In recent years, R245 fa refrigerant with ozone depletion potential of 0 and low global greenhouse effect is widely used in high temperature heat pump units. The expansion valve and water system of the unit were optimized and improved, and the superheat of R245 fa was accurately controlled. Then experiments were carried out under the condition that the average water temperature of the evaporator side was the range of 40 to 60 ℃. The results show that when the average water temperature of the evaporator side is 60 ℃, the maximum outlet water temperature of the condenser side can reach 105.8 ℃, and the COP under this condition is 2.701. At this time, the exhaust temperature and condensation pressure are lower, which meet the requirements of safe operation of the unit.
In recent years, R245 fa refrigerant with ozone depletion potential of 0 and low global greenhouse effect is widely used in high temperature heat pump units. The expansion valve and water system of the unit were optimized and improved, and the superheat of R245 fa was accurately controlled. Then experiments were carried out under the condition that the average water temperature of the evaporator side was the range of 40 to 60 ℃. The results show that when the average water temperature of the evaporator side is 60 ℃, the maximum outlet water temperature of the condenser side can reach 105.8 ℃, and the COP under this condition is 2.701. At this time, the exhaust temperature and condensation pressure are lower, which meet the requirements of safe operation of the unit.
引文
[1] Chen Chengmin.High temperature heat pump technology and system performance study [D].Tianjin :Tianjin University,2012.
[2] Zhao Li.Application and development of high temperature heat pumps in China [J].Journal of Refrigeration,2005,26(2):8-13.
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[5] Cao Zhiyong,Wang HuaiXin,Guo Tao,et al.Experimental investigations on the cycle performances of working fluids for moderate/high temperature heat pumps[J].J Eng Thermophys,2008,29(8):208-210.
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[8] Park J E ,Vakili FarahaniF ,Consolini L,Thome J R,et al.Experimental study on condensation heat transfer in vertical minichannels for new refrigerant R1234ze(E) versus R134a and R236fa[J].Experimental Thermal and Fluid Science.,2011,35(3):442-454.
[9] Zhao P C,Zhao L,Ding G L,et al.Experimental research on geothermal heat pump system with non-azeotropic working fluids[J].Applied Thermal Engineering,2002,22:1749-1761.
[10] Gao Pan,Zhao Li.Research on cycle working fluids for moderate and high temperature heat pump systems[J].J HV & AC,2006,36(1):24-27.
[11] Zhu Qiulan,Shi Lin,Han Lizhong,et al.Study on new medium-high temperature refrigerant HTR02[J].J Eng Thermophys,2005,26(2):208-210.
[12] Zan Cheng,Shi Lin.Experimental research on HTR04:A non-ozone depleting refrigerant for moderately high temperature heat pumps[J].J Eng Thermophys,2007,28(6):919-921.
[13] 马利敏,王怀信,王继霄,等.一种高温热泵工质的理论与试验性能[J].机械工程学报,2010,46(12):142-147.
[14] 刘炳伸,龚宇烈,陆振能,等.用于高温热泵蒸汽系统的几种工质的循环性能[J].可再生能源,2015,33(12):1755-1761.
[2] Zhao Li.Application and development of high temperature heat pumps in China [J].Journal of Refrigeration,2005,26(2):8-13.
[3] 王怀信,郭涛,王继霄.几种中高温热泵工质的理论循环性能[J].太阳能学报,2010,31(05):592-597.
[4] Zhang Yu,Wang Huaixin,Ma Limin.Experimental researches of a new mixture for moderate and high temperature heat pumps[J].J Eng Thermophys,2005,26(6):924-926.
[5] Cao Zhiyong,Wang HuaiXin,Guo Tao,et al.Experimental investigations on the cycle performances of working fluids for moderate/high temperature heat pumps[J].J Eng Thermophys,2008,29(8):208-210.
[6] Grauso S,Mastrullo A W,et al.Flow pattern map,heat transfer and pressure drops during evaporation of R-1234ze(E)and R134a in a horizontal,circular smooth tube:Experiments and assessment of predictive methods[J].International Journal of Refrigeration,March 2013,36(2):478-491.
[7] 马利敏,王怀信,李海龙,等.中高温热泵工质的理论研究[J].工程热物理学报,2003,24(5):737-740.
[8] Park J E ,Vakili FarahaniF ,Consolini L,Thome J R,et al.Experimental study on condensation heat transfer in vertical minichannels for new refrigerant R1234ze(E) versus R134a and R236fa[J].Experimental Thermal and Fluid Science.,2011,35(3):442-454.
[9] Zhao P C,Zhao L,Ding G L,et al.Experimental research on geothermal heat pump system with non-azeotropic working fluids[J].Applied Thermal Engineering,2002,22:1749-1761.
[10] Gao Pan,Zhao Li.Research on cycle working fluids for moderate and high temperature heat pump systems[J].J HV & AC,2006,36(1):24-27.
[11] Zhu Qiulan,Shi Lin,Han Lizhong,et al.Study on new medium-high temperature refrigerant HTR02[J].J Eng Thermophys,2005,26(2):208-210.
[12] Zan Cheng,Shi Lin.Experimental research on HTR04:A non-ozone depleting refrigerant for moderately high temperature heat pumps[J].J Eng Thermophys,2007,28(6):919-921.
[13] 马利敏,王怀信,王继霄,等.一种高温热泵工质的理论与试验性能[J].机械工程学报,2010,46(12):142-147.
[14] 刘炳伸,龚宇烈,陆振能,等.用于高温热泵蒸汽系统的几种工质的循环性能[J].可再生能源,2015,33(12):1755-1761.