化工学报2016，Vol.67Issue(z2)：378-385,8.DOI:10.11949/j.issn.0438-1157.20160981
低温下提高 CO2空气源热泵进水温度对系统性能的影响
Effects of inlet water temperature of air source carbon dioxide heat pump on system performance under low-temperature climate conditions
摘要
Abstract
Under low-temperature climate conditions,the compressor suction pressure and temperature are reduced owning to the decrease of the temperature of the inlet water and the outlet CO 2 of the gas cooler in the trans-critical cycle CO 2 heat pump system.When the compressor suction pressure is less than the lower limit of the suction pressure, it leads to the unstable operation of the system.In order to overcome this drawback, a method of mixing water at the inlet of cold water in the gas cooler is presented.Proper quantities hot water in hot water tank is supplied to the cold water inlet of the gas cooler by a by-pass pipe.Adjusting the three-way valve to change the proportion of mixing water, the inlet temperature of gas cooler is increased to make the system run steadily under low-temperature climate conditions.Test results show that the method of mixing water could not only ensure the system of CO 2 air source heat pump hot water system works steadily under low-temperature conditions,but also increase operation time of the system and reduce the frequency of frosting.However,the heating power and COP (coefficient of performance ) of the system declines slightly.Considering the operation stability and thermal performance simultaneously,the suitable temperature of mixing water for this system is 12—18℃ when ambient temperature is -20℃ and heating temperature is 60℃.关键词
二氧化碳/压缩机/实验验证/进水温度/混水/系统性能Key words
carbon dioxide/compressor/experimental validation/inlet water temperature/mixing water/system performance分类
能源科技引用本文复制引用
寇宏侨,罗会龙,杜鸿儒,杜培俭,郎峰,林辩启..低温下提高 CO2空气源热泵进水温度对系统性能的影响[J].化工学报,2016,67(z2):378-385,8.基金项目
国家科技支撑计划项目(2012BAA13B02) （2012BAA13B02）
云南省自然科学基金重点项目(2015FA018) （2015FA018）
云南省烟草公司科技项目(2015YN10)。@@@@supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2012BAA13B02), the Natural Science Foundation of Yunnan Province (2015FA018) and the Tobacco Company Science and Technology Project of Yunnan Province (2015YN10) （2015YN10）
