Study on Impedance Identification of Pipes in Heat-Supply Networks

Heat-supply network is an important part of centralized heat-supply system, and the pipe impedance can affect heat-supply network at many sides. Based on matrix equation of spatial heat-supply network hydraulic calculation method and impedance identification equation, we study the pipe impedance problem in a realistic heat-supply network, which can be transformed into optimization function and solved by genetic algorithm (GA). The existence of impedance identification equation solutions is studied. In the realistic heat-supply network, we study double operational conditions in pipes impedance identification. From the identification results, we can conclude that multi-condition is helpful to pipes impedance identification, especially user pipes. Because of the limitation of the realistic engineering, the number of operational conditions is only two. If the realistic engineering can supply more operational conditions, more accurate identification results will be obtained. The above processes are verified in realistic study and can be applied to other heat-supply network.