摘要
虽然二氧化碳跨临界循环成为最具潜力的工质替代技术,但其循环节流损大,循环效率还是比常规工质循环低,因此研制高效率的二氧化碳跨临界循环系统是推动实际应用的关键问题。在文中给出了二氧化碳膨胀机的设计思路,同时对提高效率的两个措施、采用回热器和膨胀机进行实验的对比。通过实验表明,膨胀机的运行效率与膨胀机的转速有关,而且系统的运行也受到其影响。系统采用膨胀机的运行效率高于带回热器的系统效率,说明膨胀机起到节能的作用。
In spite of being the most potential alternative technology, CO2 transcritical cycle with high COP (coefficient of performance) is the key for the actual practice. COP of CO2 transcritical cycle at present is lower than the traditional refrigerants system caused by the large throttling energy loss. In this study, the design considerations for the expander were presented. Experimental comparison was carried out between two active measures for improving COP. The experiments were conduct in the transcritical cycle heat pump system with application of an internal heat exchanger and an expander respectively. The results showed that revolution speed of the expander have an influence on its efficient as well the whole system. The COP of the heat pump system with an expander is higher than that with an internal heat exchanger.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2004年第6期929-931,共3页
Journal of Engineering Thermophysics
基金
教育部博士点专项基金资助项目(No.D0200105)
关键词
二氧化碳跨临界循环
回热器
膨胀机
CO2 transcritical cycle
internal heat exchanger
expander
