太阳能辅助CO_2热泵系统回热器设计及实验研究

在CO2跨临界循环系统中,节流损失相对较大。通过增加回热器的方法以提高跨临界CO2热泵系统的COP。根据相关的换热关联式对CO2热泵系统的回热器进行了设计计算并且进行了相关的实验研究。计算得到的回热器,长度为1.27 m,内管内径6 mm,外管内径13 mm,壁厚1 mm。并且在相同环境工况下,利用自行搭建的CO2热泵系统实验台,分别在有回热器与无回热器时进行了实验研究。实验结果表明:当系统引入回热器后,压缩机排气压力、温度上升,压缩机耗功上升速率加快,制热量增加速率亦加快,且制热量增加速率大于压缩机耗功增加速率,系统制热COP增加,带回热器时系统平均COP达到3.34,无回热器时系统平均COP为3.03,提高约10.2%。

Design and Experimental Study of the Regenerator of CO2 Heat Pump System Assisted by Solar

There is a relatively large throttling loss in CO2 transcritical cycle system. It is to improve the performance coefficient of transcritical CO2 heat pump system by reducing throttling losses with regen-erator. This paper designed CO2 heat pump system regenerator according to the relevant heat transfer corre-lations and conducted experiments related researches. And we got the size of the regenerator whose length is 1.27 m, inner tuber diameter is 6 mm, outer tuber diameter is 13 mm, and wall thickness is 1 mm. And the experiments are carried out with and without regenerator based on the CO2 heat pump system bench es-tablished by ourselves in the same environmental condition. The results show that when the system is intro-duced regenerator, compressor discharge pressure and temperature rises, the compressor power consumption increases more quickly, heat capacity rate of increase accelerates, the increase rate of heat capacity is greater than the compressor power increasing consumption, and system COP increases at the same time. The system average COP is 3.34 with regenerator while the average system COP is 3.03 without regenera-tor. There is an increase of about 10.2% of system COP compared with the system without regenerator.