Heat transfer analysis of buried pipes in district heating and cooling system

Buried pipe network is the main way of distribution system in district heating and cooling systems, and its heat transfer calculation is used to determine the thickness of the insulation layer, accessory load of distribution system, and the possibility of thermal damage. Analyses the factors that influence the heat transfer calculation of buried pipe network, including temperature difference between fluid and soil, pipe insulation properties, depth, soil thermal conductivity and distance between adjacent pipes. Present the steady-state thermal calculation method based on thermal resistance formulations, which greatly simplifies the computational effort, and the calculated results can meet project needs. This method is suitable for the majority types of buried pipe network, so it can be used as reference for engineering design.