家用变频热泵型空调器室外机换热器流路布局优化设计

Optimization design of outdoor heat exchanger's flow arrangement for residential inverter heat pump air-conditioner

对家用变频热泵型空调系统性能随Φ7 mm管室外换热器流路布局的变化进行试验研究,结果表明:热泵型空调用的室外换热器制冷工况和制热工况对应的最佳分路数不同,制冷工况时的最佳分路数少于制热工况,且分路数对制热工况性能影响更大。室外换热器流路布局设计应首选额定制热工况作为设计工况,且应优先考虑该工况下的最佳分路数对应的流路,再在此基础上适当减少制冷剂低干度区的分路数。对于用于3 500 W制冷量的二级能效R32家用变频热泵型空调器用的室外换热器,最佳分路数为3,单支路换热管长度不超过11.2 m,最佳流路布局为3进1出的"7U+7U+7U-3U"流路。

The performance of residential inverter heat pump air-conditioner system changing with the outdoor heat exchanger flow arrangement of Φ7 mm tubes is experimen- tally studied. The results show that the optimal flow number of outdoor heat exchanger under cooling mode is different from that under heating mode for heat pump air-condition- er, and the optimal flow number under heating mode is more than that under cooling mode. Furthermore, the effects of flow number on performance under heating mode are more significant. As for the optimization design of outdoor heat exchanger＇s flow arrange- ment, firstly, the rated heating condition should be chosen as the design condition to de- termine the optimal flow number. Based on this, the flow number of lower refrigerant quality region should be reduced. For the outdoor heat exchanger used for R32 residential inverter heat pump air-conditioner with 3 500 W cooling capacity and second grade energy efficiency, the optimal flow number is three, the length of heat transfer tube is not longer than 11.2 m and the optimal flow arrangement is the type of ＂7U ＋ 7U ＋ 7U- 3U＂.