基于能量品质的供热系统节能潜力分析

Analysis of energy saving potential in heating system based on energy quality

从能量品质的角度分析了供热系统的耗热,发现热源、热力站及末端散热环节均存在很大的不可逆损失,这些环节具有很大的节能潜力。采用等效电的分析方法分析了供热系统各环节的节能性,并结合经济性分析了不同节能阶段各种节能措施的优劣,认为建筑保温做到一定程度,可能不如降低热源品位的节能成本低,此时应该把节能的重点放在回收利用低品位能源、降低供热系统耗能品位上来。随着围护结构保温性能的提高及低品位能量利用技术的成熟,低温供暖与低品位热源相结合的供热方式应重点推广。

Analyses the heat loss of a heating system from the point of view of energy quality and finds that there is large irreversible loss in the heat source, heating station and end-users, therefore large energy saving potential. Analyses the possibility of energy saving in those places by electricity equivalent analysis method, and the advantages and weaknesses of various measures for energy saving in different stages based on economical efficiency. Concludes that the cost of increasing insulation of building envelope into a certain extent may be higher than that of decreasing energy quality. The key point of energy saving should be recovering and utilizing low quality energy and decreasing energy quality. Low temperature heating combined with low quality heat source should be extended with the improving of the envelope insulation and the maturing of utilization technology of low quality energy.