The Study Of Hot Water Heating Network Thermal Bridge Effect And Energy Saving Measures

In recent years, the rapid development of urban heat pipe network, especially the buried pipe laying technology has been widely used. At present, China is in a rapid development period, the energy crisis has restricted the economic development, and energy conservation has become China’s long-term basic national policy. The heating industry is a key target for energy saving.This paper analyzes the hot water heating network energy consumption on the present situation of the research at home and abroad. We study the hot water of central heating pipelines thermal bridge effect and the influence factors of thermal bridge effect. On the basis of this study, we have come to cut off measures for centralized hot water heating pipe network of thermal bridges and analysis measures effectiveness to provide a theoretical basis for its practical application.Firstly, we determine the thermal bridge effect of hot water central heating pipe network, and given a hot water central heating pipe network the concept of the thermal bridge effect. We find out the effect of thermal bridges in the hot water to focus on the location of the different arrangement of the heating pipe network. And then analyze the reasons for the formation of the thermal bridge effect, and analyze the factors affecting the thermal bridge effect. We analyzed the impact of the thermal bridge effect of the heating pipe network system transmission heat loss and the pipe network stability.Secondly, according to data collected in the project example, we have established physical and mathematical models of the thermal bridge effect of the fixed pier. The application of CFD technology in the solid-liquid coupled heat transfer of the entire simulation method to simulate the hot water central heating pipe network buried heating pipe fixed pier at the thermal bridge effect, and to simulate the various factors affecting the fixed pier at the thermal bridge effect. The numerical results show that:great heat dissipation of a single fixed pier, a depth of1.5m, heating pipe diameter of DN800’s typical fixed pier of the heat loss of 3057W.The heat dissipation is enormous compared to the pipes with insulation measures. Among the factors affecting the fixed pier thermal bridge effect, the thermal conductivity of the reinforced concrete and the impact of the supply and return water temperature are significant. Central heating pipe network can reduce heat loss of the fixed pie by reducing the thermal conductivity at the fixed pier.Thirdly, according to data collected in the project example, we have established physical and mathematical models of the thermal bridge effect of the fixation. The application of CFD technology in the solid-liquid coupled heat transfer of the entire simulation method to simulate the thermal bridge effect of the mounting bracket on overhead hot water central heating pipe network.The numerical results show that:great heat dissipation of a single fixation, a height of3.5m, heating pipe diameter of DN800’s typical fixation of the heat loss of1175W. The heat dissipation is enormous compared to the pipes with insulation measures. Among the factors affecting the fixed pier thermal bridge effect, the thermal conductivity of the reinforced concrete and the impact of the supply and return water temperature are significant. Central heating pipe network can reduce heat loss of the fixation by reducing the thermal conductivity at the fixation.Finally, we summed up the insulation in the central heating pipe network system. We determined the fixed pier and mounting bracket insulation measures and the corresponding thermal insulation material. We simulated a fixed pier, mounting bracket insulation measures insulation effectiveness and stability. The results show that the insulation measures have good thermal insulation and stability. We use a specific project examples, and analysis of the proportion of the fixed pier and mounting bracket amount of heat loss in the entire tube of heat loss. Hot water central heating pipe network energy saving potential from the instance of the pipe network, and provide theoretical support for the central heating pipe network insulation works, to provide a theoretical basis for the central heating pipe network to further energy saving.