管道热损失对直连供热系统热力工况的影响

Influence of pipeline heat loss on thermal conditions of direct connected hot water heat-supply system

分析了热源和热用户的热特性,给出了管道温降表达式,介绍了基于图论理论建立的热力工况计算模型的矩阵方程组。利用此计算模型研究了系统按设计流量运行情况下不同管道保温效果时的系统热力工况,并根据计算结果分析了管道保温效果对热用户供热质量的影响。结果表明,当管道保温不良时,系统存在较大程度的热力失调。针对热力失调特点,提出了质量流量综合调节方案。

Analyses the thermal characteristics of heat source and heat consumer, and presents the pipe temperature drop expression and matrix equations of thermal condition calculation model based on the graph theory. By the model, studies the thermal condition of system operated in design flow rate condition with different heat insulation performences, and analyses the influence of heat insulation effect on heat supply quality of heat consumer. The results show that more severe thermal disorder results from poor heat insulation effect. Considering the characteristics of thermal disorder, presents the integrative flow regulation method.