Research On Thermal Stability Of Lightweight Energy-saving Residential Buildings In Severe Cold Region

In the present study, the building thermal stability refers to the ability to withstandfluctuations of the room temperature. For the building thermal stability, people havedifferent needs. For the traditional heavy building, due to its large heat capacity, its indoortemperature is relatively stable and the thermal inertia is larger than the lighter one, it alsohas the lower heating load. So the traditional heavy building has better comfort andenergy efficiency. But the application of lightweight material is the trend of buildingconstruction development, while heat metering is the demand of energy-saving. with theapplication of lightweight construction materials, the building envelope thermal inertiabecomes smaller, the thermal stability of new residential room gets poorer relatively,which maybe cause discomfort. This issue still needs study. At the same time, the heatmetering-household (room) temperature control gets promotion, people also have newdemands of the indoor temperature regulation, and hope the regulation process is quickand effective, which is one characteristic of new lightweight energy-saving residentialbuildings different from the traditional ones.This study takes the existing reformed energy-saving residential building and newlightweight energy-saving residential building as the research object, whose envelopeheat transfer coefficient are equal. The study simulated the heat load and roomtemperature of different types rooms under different conditions through software. Bycontrasting the differences in load, room temperature changes under nature, continuousheating and accidents conditions, analyzed the thermal stability of lightweightresidential room under different conditions; And studied the thermal reaction status byincreasing the room heat supply at a particular time; Contrasted the impacts of thematerial and its order on the thermal reaction status of the envelope inner surface, bycalculating the attenuation factor and delay time of outdoor temperature wave into theindoor surface.The study evaluated the factors associated with the room thermal responseperformance, and explored the ways to improve the effect of temperature regulation andcontrol, in order to better meet the goal of energy-saving and comfort.The results show that, although computational load of lightweight building room isslightly large, but the total room heat consumption in one day is not necessarily largerthan that of the heavy room. When heating actually, there is no need to increase its heatsupply specially, the room tempreture can surpass the equivalent level with the traditionalheavy buliding;During continuous heating, the lightweight room temperature fluctuationsdo not cause discomfort, but the temperature difference between its north and south roomis bigger, namely temperature distribution is more uneven;The analysis revealed that thedifference only caused by the difference of heat capacity of the room envelope on theroom reaction performance is not very great, by contrast, the contribution of person, equipment heat dissipation and pull the curtains on the thermal response when regulatingtemperature can not be ignored. In addition, the inner surface state of the room envelopealso has a significant impact on human thermal comfort.