Study On Construction System Of Low Energy Consumption Residential Buildings In Tibet Plateau

Energy resource and environment are the great problems that every country is faced with. Solar energy resource is extraordinarily rich in Tibet plateau, while the conventional fossil energy is scarce and the unique entironment is very vulnerable. It's an important measure to promote residential building's sustainable development in Tibet, that researching low energy consumption residential building on heating residential building in winter with the abundant solar energy resources.The construction mode and thermal physical parameters of envelopes of low energy consumption have been studied systematically, based on the associated research method of theoretical analysis, numerical simulation analysis and field testing. Utilizing steady-state thermal transfer theory and non-steady-state periodic thermal transfer theory, analyzed thermal transfer, moisture transfer and sol-air temperature time lag and decrement of diversified wall constructions. With mathematical physical model and geometry model, the indoor thermal environment dynamic analysis is processed about, which effect by construction mode and thermal parameters of the interior and exterior envelopes. Optimize the construction and thermal parameters of interior and exterior envelope of low energy consumption residential building. Through systematic research, some main productions are gained:(1) Based on the significant difference of sol-air temperature in different direction, the design theory of no-uniformity insulation construction is proposed for the first time. In this theory, north exterior wall's insulation system is reinforced significantly and east/west wall's insulation system take second place and south exterior wall without insulation. This design can improve the interior surface temperature of the north wall and improve the indoor thermal environment availably, especially for north room.(2) Through analysis the time lag and decrement factor for sol-air temperature in different direction of energy-saving walls, the law of time lag & decrement factor affected by construction mode and thermal physical parameters is found. The concept "low temperature time lag" is proposed for the first time, which can describe the time lag and decrement factor exactly in high solar radiating condition.(3) Propose a new method, that adopting different direction sol-air temperature as calculating temperature to analyze moisture transfer in envelope of different constructions in the high solar radiation region. And the matter of dew-formation in construction interface is analyzed in the paper.(4) Propose the indoor thermal environment standards of low energy consumption residential building which is based on the room function. The result of field measurement indoor and outdoor thermal environment in winter demonstrate the indoor thermal environment and geometry model, which are proposed in this paper, and analysis process are satisfied.Expect this study make a useful complement for the envelope design theory and provide theory basis for editing energy-saving construction drawing of residential building in high solar region.