以R290为工质的双缸压缩机中间补气热泵系统的性能分析

Performance Analysis of Vapour Injection Heat Pump System with Dual Cylinder Compressor Using R290

补气可以降低压缩机排气温度,增加制热量,提高系统的制热COP。R290制冷剂环保高效,在家用空调领域具有良好的前景。建立了R290双缸压缩机中间补气热泵系统的模型,分析了冬季制热工况下补气压力、补气过热度和相对补气量等参数对系统性能的影响。结果表明:补气压力对制热量无明显影响,最佳补气压力为6.94~10.83 bar;补气过热度在0~10℃范围内对系统制热量和COP的影响在1%以内;制热工况下最佳高低压缸容积比为0.33~0.53;相对补气量每增加10%,系统的平均COP和制热量分别增加了3.5%和8.9%,功耗增加4.7%。

Vapour injection cycle(VIC)can decrease discharge temperature and increase heating capacity,improving COP of compressor.R290,as an environment-friendly and efficient refrigerant,is promising in the field of air-conditioning.In this paper,the model of R290 dual cylinder compressor with VIC is established.The influence of injected vapour pressure,degree of superheat of injected vapour and relative mass rate of injected vapour on system performance under the heating condition in winter are analyzed.The results show that injected vapour pressure has no obvious influence on the heating capacity,the optimized injected vapour pressure ranges from 6.94 bar to 10.83 bar;the influence of degree of superheat of injected vapour on both heat capacity and COP is within 1%;the optimum volume ratio of high pressure cylinder to low pressure cylinder ranges from 0.33 to 0.53;when the relative mass rate of injected vapour increase 10%,the average COP,heating capacity and power consumption increase 3.5%,8.9% and 4.7%respectively.