Research On Integrated Thermal Inertia Of Residential Buildings In Cold Region Of China

Energy saving and environment protection become one of the most important tasks for the governments around the world, as the problem of energy and environment become more and more serious. Building energy consumption accounts for 1/5 of the total energy consumption of the world, and which is the 1/4 of the country's total energy in China. The centralized space heating energy consumption of Northern China occupies a proportion of about 40% of urban building energy consumption, which is a large part of building energy consumption. There is the problem of energy waste of centralized heating, since there are no advanced controlling methods for many centralized heating systems, the adjustments are made manually and entirely depend on experience according to weather condition without considering the effect of other factors. Not only outdoor weather temperature but also the thermal inertia of pipe network and the integrated thermal inertia of buildings should be taken into account during the adjusting process.This dissertation mainly research on the integrated thermal inertia of residential buildings in Cold Region of China. Through indoor temperature and envelope surface temperature measurement, the performance characteristics of different orientation during heating period and without heating period were analyzed. The influence to integrated thermal inertia was researched with different area ratio of window to wall, envelope insulation, occupancy activity and furniture in the small scale building model experiment. Indoor temperature of residential building model was simulated and compared in eQUEST software corresponding to occasion without any heating equipments, occasion with water heaters. All influence factors on integrated thermal inertia of buildings were analyzed and generalized. The characteristics of integrated thermal inertia of the residential buildings were summarized in terms of time lag and decrement factor by the general comparison and analysis of the simulation and experiment results.The research results indicate that the integrated thermal inertia of residential buildings is related to the envelope materials of buildings, orientation, area ratio of window to wall and other factors. The time lag between the indoor temperatures and the outdoor air temperatures is about 2 hours, and the decrement factor is about 0.2 of residential building in Cold Region. The experiment results show that without considering the influence of solar radiation, the furniture in the room play the most important role to the indoor temperature of the residential building; the second factor is the heat emission of human activities and devices in the rooms; and then it is the area ratio of window to wall of building.