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 re- lieve 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 efficien- cy 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.