Setting and application analysis of distributed heat sources of secondary network in central heating systems

Presents two combined operation modes of the basic heat source and the distributed heat source, establishes the economic models of the two heat source combined operation taking minimum annual operating cost and minimum annual cost in life cycle as the objects respectively, and analyses the application of the combined operation to a central heat supply system in Harbin. The results show that the heating system of the basic heat source combined with the distributed heat source is more economical than the single heat source heating system in annual operating cost, and considering the dynamic economic effects, the savings of annual operating cost is more considerable in life cycle. Taking minimum annual operating cost and minimum annual cost in life cycle as the objects, concludes that the optimum capacity coefficients of the basic heat source are 0.70 to 0.75 and 0.60 to 0.65 respectively.