摘要
传统热泵空调在低温环境下使用存在频繁结霜除霜,导致连续运行制热性能大幅衰减,制约了热泵空调的推广应用。针对上述问题,从低温制热运行期间压缩机频率、电子膨胀阀开度及排气温度等系统参数,以及换热器管温变化对制热性能和结除霜情况的影响进行理论分析和实验验证,结果表明:低温制热性能的提升需要综合考虑压缩机运行频率、电子膨胀阀开度及换热器管温的影响;可以适当提高空调系统蒸发压力和蒸发温度,减弱室外换热器结除霜情况对低温制热性能的影响;在进入除霜前的运行阶段应避免电子膨胀阀开度不断关小使空调系统循环流量减小,进而加速系统低温制热性能衰减。
Traditional heat pump air conditioners experience frequent frosting and defrosting in low-temperature environments,leading to a significant decline in continuous heating performance,which restricts the promotion and application of heat pump air conditioners.In response to these issues,conducts theoretical analysis and experimental verification on the impact of system parameters such as compressor frequency,electronic expansion valve opening,and exhaust temperature during low-temperature heating operation,as well as the changes in heat exchanger tube temperature on heating performance and frosting/defrosting conditions.The results show that improving low-temperature heating performance requires a comprehensive consideration of the effects of compressor operating frequency,electronic expansion valve opening,and heat exchanger tube temperature;it is possible to appropriately increase the evaporating pressure and temperature of the air conditioning system to weaken the impact of outdoor heat exchanger frosting and defrosting on low-temperature heating performance;during the operation phase before entering defrosting,it should be avoided to continuously reduce the opening of the electronic expansion valve,which would decrease the circulation flow of the air conditioning system and thus accelerate the rapid decline of the system’s low-temperature heating performance.
作者
刘钊行
王晓倩
何振健
冯青龙
LIU Zhaohang;WANG Xiaoqian;HE Zhenjian;FENG Qinglong(GREE Electric Appliances,Inc.of Zhuhai,Zhuhai 519070;Green Refrigeration Equipment Engineering Research Center of Zhuhai GREE Co.,Ltd.,Zhuhai 519070)
出处
《家电科技》
2025年第S1期241-245,共5页
Journal of Appliance Science & Technology
关键词
热泵空调
低温制热性能
理论分析
实验验证
Heat pump air conditioner
Low-temperature heating performance
Theoretical analysis
Experimental verification
