CHARACTERIZATION OF DISTRICT HEATING ENERGY USE OF A TYPICAL RESIDENTIAL BUILDING IN NORTH CHINA

In order to effectively impel the energy efficiency retrofit of residential buildings in north China, it is very important to understand the characteristics of district heating energy use and its influence factors. A typical residential building was selected in Tangshan city, and the experiment was made to measure its district heating energy use and indoor temperature in the space heating period of 2009. Building air tightness performance was tested, and window opening of all the families was also monitored. The corrected index of heat loss of this building is 31.6w/m(2), much larger than the 50% energy saving target of 20.8w/m(2). Indoor average temperature can reach 20.09(omicron)C. Vertical temperature disorder is relatively obvious in this old single pipe vertical system. The air tightness performance is relatively good, while window opening during the daytime causes big energy waste in winter. By future analyzing energy saving potential, there exist several ways to reduce space heating energy use: (1) improve the poor thermal performance of envelope; (2) set the indoor temperature lower; (3) improve the hydraulic performance of heat supply pipe network; (4) effectively control the window opening and hence reduce the ventilation rate of window opening.