基于热媒参数的供热系统经济性及分析
Economics and exergy analysis for heating system based on the parameters of water temperature
摘要：
以长春市的一个居住小区为例，对采用不同热媒参数的供暖系统进行经济性分析和分析。结果表明，供热系统的热媒参数对经济性影响较大，热媒温度越高，供热系统的初投资越小。提出了确定最佳回水温度的方法，二次网供水温度为60 ℃时，最佳回水温度为41.6 ℃。在以锅炉为热源的供热系统中，损较大，约占总损的78％；对于不同的热媒参数，损差别不大，但供热系统的初投资差别很大。从能源利用及经济性出发，无论一次网还是二次网，提高热媒温度对供热系统是合理的。
Abstract：
Taking a residential quarter in Changchun as an example, analyses the economics and exergy for heating system with different heating medium parameters. The results show that the water temperature greatly affects economics of the heating system, and the higher supply/return water temperatures, the lower the initial investment. Proposes the method defining optimum return water temperature, which is 41.6 ℃ in the condition of supply water temperature of 60 ℃ for end users. The exergy loss of boiler heating systems takes about 78％ of the total exergy loss, and for different heating medium parameters, the exergy loss has little variance, while the initial investment for heating system is greatly different. For either primary network or secondary network, increasing supply water temperature is reasonable for utilizing energy and reducing initial investment of heating system.
Keywords:supply and return water temperatures, district heating system, economic analysis, exergy loss