Analysis and verification of high efficiency and comfort technology of heat pump air conditioners

In the actual use of traditional heat pump air conditioners, there are problems such as serious attenuation of operating capacity and energy efficiency under wide temperature conditions, hot head and cold feet of heating air supply, and large fluctuations of indoor temperature during defrosting, resulting in discomfort and not energy saving, which restrict the stable, efficient and comfortable operation of heat pump air conditioners. In view of the above problems, this paper performs the research and innovation from the compression technology, air supply technology, defrosting technology and other aspects, and carries out an experimental comparative analysis with the traditional heat pump air conditioner. The results show that the heat pump air conditioner applying the above technologies can realize efficient operation under the wide temperature condition of -40 to 65 ℃. The vertical air temperature difference of heating air supply is reduced to 0.11 ℃, and the heat utilization efficiency in human activity area is increased by 7.4% to 15.7%. During the defrosting period, the indoor temperature fluctuation is reduced to 0.93 ℃, and the defrosting efficiency is improved by 23% to 36%.