Cooling loss of district cooling pipe network under variable load conditions

 Presents the calculation method of cooling loss for district cooling pipe network and calculates the cooling loss of pipe network under different laying ways and load rates for a typical project. The result shows that directly buried pipe network can keep a minimum cooling loss. The cooling loss of the secondary pipe network accounts for a small part of its total transport cooling capacity, which can be controlled less than 1%, and the cooling loss of the secondary pump is the key factor and can account for more than 78% under design condition. Cooling loss rates of secondary pump and pipe change significantly under different load rates. The cooling loss of secondary pump accounts for 75% under 80% load rate, and the cooling loss of pipe and secondary pump each accounts for 50% under 30% load rate. However, the cooling loss of pipe accounts for 70% under 10% load rate, which becomes the main part of system cooling loss.