Research On Energy-saving Technology Of Wannan Traditional Houses Envelope Structure

As the proportion of China’s total energy consumption of the building’s total energyconsumption increased year by year, the sustainable development of energy-efficientbuildings has attracted much attention. Some of the traditional practices of local conditions inWannan houses, just is the pursuit of sustainable development construction of low technologyand appropriate technology.Therefore, the study of Wannan traditional houses for solvingtoday’s residential energy consumption and indoor thermal environment has a very importantsignificance.In this paper, taking Wannan houses as the main research object, through fieldinvestigation, collecting and sorting data, some excellent traditional passive energy-savingtechnologies were found in construction site layout, single design, building envelope andsuperior insulation and other aspects of traditional houses; having a comprehensiveunderstanding of the present situation of local residences and energy conservation problemsof the envelope structure;getting the field measurement of indoor thermal environmental datain the local traditional house as well as modern residence. The result shows that the indoorsummer average temperature of traditional house is lower than modern residence about1~2℃,the winter indoor temperature is more stable.All of this indicates that the traditional dwellingshave a higher comfort than modern residences, but the winter indoor thermal environment oftwo types residences are yet to be improved.In order to further grasp the influence of the envelope to residential indoor thermalenvironment, the thermal performance of the wall and roof of houses were calculated,and forthe special cavity wall, put forward a reasonable calculation model. Research has shown thatthe thermal performance of the cavity wall is better than the solid wall; the main factorsaffecting the thermal performance of the wall are its way of masonry, materials andconstruction practices; the thermal resistance of cavity wall with thermal conductivity of thefilling material decreases and increases;the thermal performance of the gable roof setting boards is optimal, the temperature difference of the roof indoor and outdoor in summer canreach9.2℃. And on this basis, put forward the proposed optimization design for the buildingenvelope.To make study more in-depth rational, scientific and intuitive，this article selects a typicalnew local dwellings as an example, using the DEST-h energy consumption simulationsoftware of Tsinghua university, based on the optimization design of retaining structures andmade simulation analysis to eight different schemes for the palisade structure, comparedvarious schemes of the winter and summer design day natural room temperature, energyconsumption and energy saving rate. Studies have proved that the slope roof with goodventilation performance is more suitable for the area in the south of Anhui;when layer filledwith foam concrete, the thermal performance of cavity wall will be greatly improved; thecavity wall filled rice husk can energy saving10%than the solid wall.In summary, Wannan traditional residential energy-saving technology will be a model ofenergy-saving technology in our country. Cavity wall masonry, the practice of double-slopingroof and cavity wall filled with rice husks in this region have promotion use value ofengineering application and prospect.