Abstract:

Aiming at the household air source heat pump for “coal to electricity”, a capillary as a throttle element is proposed to replace the thermal expansion valve or the electronic expansion valve, and an experimental device for heat pump system was set up. The influence of different capillary length on the compressor suction pressure, exhaust temperature and heat capacity of the unit under variable frequency regulation of compressor were experimentally studied. The experimental results show that, after replacing the thermal expansion valve or the electronic expansion valve, the system can run stably for a long time. The system has the best thermal performance when the capillary length is 500 mm and the compressor frequency is 35 Hz, and the heating capacity and heating COP are the largest, but the suction pressure and the exhaust temperature are moderate.

摘要：

针对家用“煤改电”空气源热泵，提出采用毛细管作为节流元件替代热力膨胀阀或电子膨胀阀，搭建了热泵系统实验装置。研究压缩机不同频率下，不同的毛细管长度对压缩机吸气压力、排气温度和机组制热量等制热性能的影响。实验结果表明，毛细管替代热力膨胀阀或电子膨胀阀后，系统能够长时间稳定运行；毛细管长度为500 mm、压缩机频率为35 Hz时系统制热性能最优，制热量、制热COP获得最大值，而其吸气压力和排气温度适中。