极端高温环境下空气源热泵冷热水机组制冷实验研究

针对现有空气源热泵冷热水机组高温环境运行效果差、效率低、排气温度过高导致停机等问题,设计一套基于准双级压缩循环理论,以R410A为制冷剂的中压补气型空气源热泵冷热水机组。在50℃极端环境温度下,采用中压补气技术,对系统的制冷性能进行实验研究。结果表明:(1)系统出水温度由10℃增至15℃时,制冷量增加77.28%,EER提高59.02%,系统的制冷量、功率和EER均随出水温度的升高而增加;(2)相较不补气模式,系统排气温度由111.9℃降至106.23℃,制冷量由14.14 kW增至16.05 kW,可有效降低排气温度,提升制冷量,能更好提高系统超高温制冷时的稳定性。

Experimental study on refrigeration of air source heat pump water chiller at high ambient temperature

In view of the problems such as poor operation effect, low efficiency and high exhaust temperature of the air-cooled heat pump chiller in high temperature enviroment, the stability of the system in ultra-high temperature refrigeration can be improved by using medium pressure air supply. based on quasi-two-stage compression cycle theory, an air air-cooled heat pump chiller with R410 A as refrigerant was designed. The refrigeration performance of the heat pump system was studied under the extreme enviroment temperature of 50 ℃, different air supplement types and different outlet water temperature. The conclusions are as follows:(1)In the case of 50 ℃ extreme high temperature, the cooling capacity, power and EER of the system increase with the increase of outlet water temperature.When the outlet temperature increases from 10 ℃ to 15 ℃, the cooling capacity increases by 77.28% and EER increases by 59.02%;(2) In the case of 50 ℃ extreme high temperature, the medium pressure air supply technology can effectively reduce the exhaust temperature and improve the cooling capacity. Compared with the mode without air repienishment, when the medium pressure air replenishment is turned on, the exhaust temperature decreases from 111.9 ℃ to 106.23 ℃, and the cooling capacity increases from 14.14 kW to 16.05 kW. The stability of systemin ultra-high temperature can be improved by using medium pressure air supply.