热泵在热电联产集中供热系统中的应用及分析

Application and Exergy Analysis of Heat Pumps in Co-generation Central Heating System

为提高现有集中供热系统的供热能力和供热效率,以缓解冬季日益增长的采暖供热缺口,文中基于一现有热电联产集中供热系统,设计了新增热源和利用热泵两种提升供热能力的方案,并对比分析不同方案对供热系统COP(制热能效比)、效率和经济性的影响.研究结果表明:采用新增热源方案的供热系统COP为0.98,与现有系统基本持平,效率为28.39%,相比于现有系统降低了39.15%,动态回收期为7.98年;采用热泵方案的供热系统COP为1.34、效率为62.69%,相比于现有系统分别提升了35.4%、34.36%,动态回收期为5.73年,且具有良好的经济适应性.

In order to improve the heating capacity and efficiency of the existing central heating system and thus relieve the growing pressure on the heating system in winter,two schemes of adding new heating and adopting heat pumps are designed based on an existing co-generation central heating system. Then,the COP,the exergy efficiency and the payback period are used to evaluate the two schemes. The results show that,when the new heating is added,the central heating system achieves a COP of 0. 98,which is almost equal to that of the existing system,and an exergy efficiency of 28. 39%,which is decreased by 39. 15%,as well as a dynamic payback period of 7. 98 years,and that,when the heat pumps are adopted,the COP and the exergy efficiency of the central heating system are respectively 1. 34 and 62. 69%,which are respectively 35. 4% and 34. 36% higher than those of the existing system,and the dynamic payback period is 5. 73 years. In addition,the system adopting the heat pumps is of a good economic adaptability.