Dynamic thermal performance of district heating network under typical safety accidents

Abstract

The key to guarantee district heating (DH) network work normally is to improve its safety performance which requires us to know the feedback of DH network in time when an accident occurs. Therefore, a dynamic mathematical model of coupled thermo-hydraulic for anticipating the dynamics in DH systems is established in this work. The dynamic temperature of the DH network and time delay of the coupled thermohydraulic transmission are investigated when the accident (insulation layer falling off or water supply temperature sudden change) occurs. The effects of two accidents on the DH network are analyzed thoroughly. The results show that the proposed model is suitable for the numerical simulation of specific conditions of the DH network. This is helpful to obtain the data information of the DH network under accident conditions and promote the stable operation of DH network. This method can be combined with other techniques to further improve the performance.