Analysis Of Energy Consumption Characteristics Of Intermittent Heating Rooms Under Different Outdoor Air Temperature Conditions

The hot summer and cold winter regions of China is cold and wet in winter.However,due to national policies,the area does not have centralized heating,so the indoor environment and comfort of the rooms is poor in winter.With the continuous development of China's economy,more and more people in the hot summer and cold winter regions choose to perform heating in the winter.Different from the central heating method in the north,the heating method in the area mostly uses intermittent heating,which is characterized by the fact that turn on heating equipment when people are here and otherwise turn it off.Heating energy for intermittent heating is not only due to the heat loss of the external wall,but also partly due to the heat absorption of the indoor regenerator such as interior walls.But the heating energy of continuous heating in the North only comes from the heat transfer caused by the difference in temperature between indoor and outdoor.Therefore,the experience and research results of northern centralized heating are difficult to apply to this region.Besides,there are few studies on the characteristics of energy consumption in intermittent heating rooms.Hence numerical simulations are used to study the temperature variations of indoor air and solids in 50 cases.By analyzing the temperature variation characteristics of indoor air,walls and indoor furniture,the energy consumption characteristics of intermittent heating rooms are obtained,which provides a theoretical basis for reducing the winter heating energy consumption in hot summer and cold winter regions.The results in this paper show that in the “partial space,partial time” heating mode in hot summer and cold winter areas,the wall heat transfer energy includes the heat transferred to the outdoor and adjacent rooms and the heat stored in the wall during heating.Regardless of the heating time ratio,the ratio of wall heat transfer energy consumption to total heating energy consumption of the intermittent heating room is above 75%,and when the heating time is relatively small,it is even up to 90%.And the proportion of heat transferred directly to the outdoor and adjacent rooms is small relative to the stored heat stored in the wall in intermittent heating room.That is,the heat storage energy is the main component of the energy consumption of the intermittent heating room,and this part of the energy consumption is almost absent in the continuous heating room.Because the surface area of the inner envelope structure is much larger than that of the outer wall,the heat energy consumed by heat absorption on the surface is significantly greater than that of the latter.In the energy consumption of the internal wall heat storage,the heat absorption of the surface of the floor and ceiling causes the largest proportion of the heat storage energy.Therefore,in order to reduce the energy consumption of intermittent heating rooms,reducing the heat absorption index or heat storage of the inner wall surface can effectively reduce heating energy consumption.The lower the outdoor air temperature is and the smaller the heating time is,and the more obvious the temperature of indoor solids(interior and exterior walls and furniture)decreases during the stop of heating,which leads to greater heat storage energy when heating again.Therefore,in hot summer and cold winter regions where winter climate is relatively cold,it is more meaningful to reduce the internal wall heat storage capacity than to enhance insulation of external walls in order to reduce the heating energy consumption for buildings with intermittent heating characteristics.