跨临界CO_2热泵高温热水器性能实验研究
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摘要
本文针对排气压力、出水温度、压缩机频率、膨胀阀开度等参数的变化对跨临界CO_2热泵高温热水器性能的影响开展了实验研究,重点关注了出水温度高于75℃时的热水器性能特性。研究结果表明:不同出水温度对应不同最优排气压力,随着出口水温的升高,最优排气压力升高,相应系统性能降低;随着蒸发压力的升高,系统COP先增大后减小;在膨胀阀开度不变的情况下,压缩机频率85 Hz、环境温度25℃、蒸发温度14℃时,系统制取95℃热水时的最优COP为3.9。
This paper studied the influence of parameters such as discharge pressure, outlet temperature of water, compressor frequency and expansion valve opening degree on the performance of a trans-critical CO_2 heat pump high-temperature water heater. There is an optimal discharge pressure for different water outlet temperature, and the optimal discharge pressure increases with the increase of inlet water temperature, at the same time the system performance decreases. Results also indicated that the system COP increases first and then decreases with the increase of the evaporation pressure. The effect of compressor frequency on system performance under the same opening degree of expansion valve is studied. Results showed that a maximum COP of 3.9 is reached when the compressor frequency is 85 Hz.
This paper studied the influence of parameters such as discharge pressure, outlet temperature of water, compressor frequency and expansion valve opening degree on the performance of a trans-critical CO_2 heat pump high-temperature water heater. There is an optimal discharge pressure for different water outlet temperature, and the optimal discharge pressure increases with the increase of inlet water temperature, at the same time the system performance decreases. Results also indicated that the system COP increases first and then decreases with the increase of the evaporation pressure. The effect of compressor frequency on system performance under the same opening degree of expansion valve is studied. Results showed that a maximum COP of 3.9 is reached when the compressor frequency is 85 Hz.
引文
[1]马一太,李敏霞,田华,等.自然工质二氧化碳制冷与热泵循环原理的研究与进展[M].北京:科学出版社,2017:13-15MA Yitai,LI Minxia,TIAN Hua,et al.Research and Development on Refrigeration and Heat Pump Cycle With Natural Working Refrigerant Carbon Dioxide[M].Beijing:Science Press,2017:13-15
[2]Zhu Y H,Li C H,Zhang F Z,Jiang P X.Comprehen-sive Experimental Study on a Transcritical CO_2 EjectorExpansion Refrigeration System[J].Energy Conversion and Management,2017,151:98-106
[3]丁国良,黄冬平.二氧化碳制冷技术[M].北京:化学工业出版社,2007:216-220DING Guoliang,HUANG Dongping.Carbon Dioxide Refrigeration Technology[M].Beijing:Chemical Industry Press,2007:216-220
[4]宋昱龙,唐学平,王守国,等.跨临界CO_2热泵气体冷却器对系统性能及最优排气压力的影响[J].制冷学报,2015,36(4):7-15SONG Yulong,TANG Xueping,WANG Shouguo,et al.The Effects of the Gas Cooler on Both the System Performance and the Optimal Discharge Pressure at a Transcritical CO_2 Heat Pump[J].Journal of Refrigeration,2015,36(4):7-15
[5]Sarkar J.Review on Cycle Modifications of Transcritical CO_2 Refrigeration and Heat Pump Systems[J].Journal of Advanced Research in Mechanical Engineering,2010,1:22-29
[6]Liu X F,Liu C H.Experimental Study on the Performance of Water Source Trans-Critical CO_2 Heat Pump Water Heater[J].Energies,2017,10:1-14
[7]Qi P C,He Y L,Wang X L,et al.Experimental Investigation of the Optimal Heat Rejection Pressure for a Trans-Critical CO_2 Heat Pump Water Heater[J].Applied Thermal Engineering,2013,56:120-125
[8]Saikawa M,Koyama S.Thermodynamic Analysis of Vapor Compression Heat Pump Cycle for Tap Water Heating and Development of CO_2 Heat Pump Water Heater for Residential Use[J].Applied Thermal Engineering,2016,106:1236-1243
[9]Zhang J F,Qin Y,Wang C C.Review on CO_2 Heat Pump Water Heater for Residential Use in Japan[J].Renewable and Sustainable Energy Reviews,2015,50:1383-1391
[10]White S D,Yarrall M G,Cleland D J,et al.Modelling the Performance of a Transcritical CO_2 Heat Pump for High Temperature Heating[J].Journal of Refrigeration,2002,25:479-86
[2]Zhu Y H,Li C H,Zhang F Z,Jiang P X.Comprehen-sive Experimental Study on a Transcritical CO_2 EjectorExpansion Refrigeration System[J].Energy Conversion and Management,2017,151:98-106
[3]丁国良,黄冬平.二氧化碳制冷技术[M].北京:化学工业出版社,2007:216-220DING Guoliang,HUANG Dongping.Carbon Dioxide Refrigeration Technology[M].Beijing:Chemical Industry Press,2007:216-220
[4]宋昱龙,唐学平,王守国,等.跨临界CO_2热泵气体冷却器对系统性能及最优排气压力的影响[J].制冷学报,2015,36(4):7-15SONG Yulong,TANG Xueping,WANG Shouguo,et al.The Effects of the Gas Cooler on Both the System Performance and the Optimal Discharge Pressure at a Transcritical CO_2 Heat Pump[J].Journal of Refrigeration,2015,36(4):7-15
[5]Sarkar J.Review on Cycle Modifications of Transcritical CO_2 Refrigeration and Heat Pump Systems[J].Journal of Advanced Research in Mechanical Engineering,2010,1:22-29
[6]Liu X F,Liu C H.Experimental Study on the Performance of Water Source Trans-Critical CO_2 Heat Pump Water Heater[J].Energies,2017,10:1-14
[7]Qi P C,He Y L,Wang X L,et al.Experimental Investigation of the Optimal Heat Rejection Pressure for a Trans-Critical CO_2 Heat Pump Water Heater[J].Applied Thermal Engineering,2013,56:120-125
[8]Saikawa M,Koyama S.Thermodynamic Analysis of Vapor Compression Heat Pump Cycle for Tap Water Heating and Development of CO_2 Heat Pump Water Heater for Residential Use[J].Applied Thermal Engineering,2016,106:1236-1243
[9]Zhang J F,Qin Y,Wang C C.Review on CO_2 Heat Pump Water Heater for Residential Use in Japan[J].Renewable and Sustainable Energy Reviews,2015,50:1383-1391
[10]White S D,Yarrall M G,Cleland D J,et al.Modelling the Performance of a Transcritical CO_2 Heat Pump for High Temperature Heating[J].Journal of Refrigeration,2002,25:479-86