A Study On The Economic Specific Frictional Resistance Of The Heat Network In A Region

Heat supply engineering is closely related to people's livelihood.In the heat supply engineering,the heating pipe network is the bridge between the heat source and the hot user,its importance is self-evident.With the rapid development of heat-supply enterprise in our country and the continuous improvement of people's living standard,the demand for heating quality also increase,the investment and transmission energy consumption of heating pipe network have great influence on energy saving,resources and economy.When designing the heating pipe network,the selection of related parameters of heat network,especially the selection of friction resistance plays an irreplaceable role in controlling the life cycle cost of the heat network,and it also decides the security and reliability of heat network.At present,the selection of China's thermal network is mainly based on the experience of the former Soviet union which is recommended 30-70 pa /m or 40-80pa/m.With the development of the heating industry in China,whether this scope can truly reflect the economic performance of different regional heating networks needs to be further studied.The purpose of this study is based on the optimization theory,optimizing the heating pipe network by means of technical and economic analysis,and the network economic specific frictional resistance of the optimization problem is discussed,to make it more consistent with the requirements of heating network economy under the premise of guaranteeing the heating effect,for reducing the economic loss of society construction which is caused by the heating engineering.This topic mainly analyzes the economic specific frictional resistance of the first class hot water heating network in Tiexi district of Tieling city.First,it introduced the concept of life cycle cost,analyzed the composition and calculation methods of life cycle cost,and choosed the analytic method to build the mathematical model based on the minimum life cycle cost of the first class heating network,based on the data of the actual research of Tiexi first class heating network,the optimization calculation of single target parameter is carried out,through the mathematical model,the economic specific frictional resistance of the heating network under the design thermal load and the actual maximum thermal load is calculated,and compared with thetraditional method of calculating economic specific frictional resistance,compared the cost and total cost of the heating network in these three cases in the life cycle,it is concluded that the total cost of the optimal design under the actual maximum thermal load is the lowest.Then,further analysis is made on the economic specific frictional resistance of the typical heating scale under different water supply and backwater temperature,the range is not completely covered in the traditional specification recommended range of 30-70 Pa /m or 40-80 Pa /m,therefore,it is verified that in the precondition of technical economy,the range of specific frictional resistance recommended in the specification is not completely applicable to different regions.It should be based on the economic conditions and environmental factors of different regions,it is more reasonable to use the method of this topic to calculate the economic economic specific frictional resistance and select the suitable diameter of heating network.Finally,the influence of various factors on the economic specific frictional resistance is analyzed,and the sensitivity factors and non-sensitivity factors that affect the economic specific frictional resistance are determined.