Thermal work condition analysis of teaching building heating network in winter vacation with user regulation

Indoor temperature of teaching building should be reduced properly in winter vacation in order to save heating energy consumption as much as possible, and acceptable indoor temperature should keep pipe network of teaching building from frozen and wall surface of teaching building isn't damaged because of dew. This paper concentrates on heating network of teaching building in extremely cold areas of China with user regulation, and analyzes thermal work condition of teaching building heating network with lower indoor temperature. The two schemes, supply water mixed with return water by mixing pump to reduce supply water temperature and flow reduction of teaching building, are applied to reduce indoor temperature. The supply water of heating network changes with outdoor temperature based on constant flow control and centralized control with flow varied by steps. Supply and return water temperature and flow of teaching building in four work condition with lower indoor temperature was calculated respectively. The calculated result shows that relative flow of building in scheme 1 keeps constant and is less than 0.35 in scheme 2. The conclusion is that scheme 1 of mixed with return water is better than scheme 2 of building's flow reduction, and centralized control with flow varied by steps on supply water of heating network is better than constant flow control in winter vacation.