摘要
为了探究室外侧微通道蒸发器制冷剂分布和换热器表面温度分布的均匀性,课题组设计了一种4换热器的热泵系统。分别在制冷和制热工况下,对室外侧换热器在不同的制冷剂充注量和不同的压缩机转速下的表面温度分布均匀性进行了实验研究。使用K型热电偶布点并测量换热器表面温度并使用红外热成像仪了解其温度分布情况。结果表明:制冷工况下,充注量在1 050~1 075 g时,在不同转速下,系统的制冷性能最佳,同时换热器表面温度分布均匀性最好;而在制热工况下,充注量在500~700 g时,换热器表面温度分布均匀性随着制冷剂充注量的增加而改善。同一换热器在作为冷凝器和蒸发器时,制冷剂充注量和压缩机转速对其温度分布均匀性的影响不同。
In order to investigate the uniformity of the refrigerant distribution and the surface temperature distribution of the external microchannel heat exchanger,a heat pump system with four heat exchangers was designed. The uniformity of the surface temperature distribution of the external heat exchanger in different refrigerant charge and different compressor revolving speed was experimentally investigated under the conditions of refrigeration and heating respectively.The K-type thermocouple was used to locate and measure the surface temperature of the heat exchanger,and the temperature distribution of the heat exchanger was analyzed by infrared thermal imager. The results show that under the refrigeration condition,the refrigeration performance of the system is the best and the surface temperature distribution of the heat exchanger is uniform when the amount of filling is between 1 050 - 1 075 g. While under heating condition,the uniformity of surface temperature distribution of heat exchanger is improved with the increase of refrigerant charge when the charge of refrigerant is between 500 - 700 g. When the same heat exchanger is used as condenser and evaporator,the influence of refrigerant charge and compressor speed on the uniformity of temperature distribution is different.
作者
唐启天
李康
呼延吉
苏林
TANG Qitian;LI Kang;HU Yanji;SU Lin(School of Energy-and Power Engineering,University of Shanghai for Science and Technology-,Shanghai 200093,China;Young Power Technology,Shanghai 200093,China)
出处
《轻工机械》
CAS
2018年第5期77-81,共5页
Light Industry Machinery
关键词
纯电动汽车
热泵
微通道换热器
温度分布
均匀性
pure electric vehicles
heat pump
nficrochannel heat exchanger
temperature distribution
uniformity
