空气源热泵制冷剂充注量的实验和计算研究

Research on experiment and calculation of refrigerant charging amount of air-source heat pump

由于换热器形式不同,分体式空气源热泵产品存在室外机换热器容积大于室内机换热器容积的现象,若采用常规的制冷使用室内机节流、制热采用室外机节流方式,则会出现制冷剂充注量无法兼顾的情况。在系统中不增加其他制冷剂储液器的情况下,通过调整联机配管尺寸,并且在制冷时同样使用室外机节流的方式,可解决此问题。实验中使用了8 kW机型,应用R32制冷剂,通过实验和计算,得到室内机和室外机中最优制冷剂充注量总和,计算联机配管中制冷剂充注量与联机配管长度的关系,最终得到最优联机配管长度和最优制冷剂充注量。最后通过实验验证,确定了使用此计算方式得到可以兼顾制冷、制热的制冷剂充注量的可行性。

Due to the difference of heat exchanger in split air-source heat punp,it is difficult to give consideration to refrigerant charging amount of both cooling throttling by indoor unit and heating throttling by outdoor unit.This problem can be solved by adjusting the size of piping connection between indoor unit and outdoor unit,and throttling by outdoor unit in both cooling and heating conditions,without adding other refrigerant receivers.According to the experiment and calculation of 8 kW unit using R32,the optimal refrigerant amount in indoor unit and outdoor unit can be obtained.Then the correlation between the refrigerant amount in piping connection and length of piping connection were carried out,and optimal refrigerant charging amount can be determined.Finally,the optimal piping connection and refrigerant charging amount were verified by experiment,which were suitable for both cooling and heating.