Research On Building's Energy Saving And Solar Heat Utilization In North

There is severe haze in northern China,and one of the most important reason is the house heating with coal,and it's very common in countryside.So it's very necessary to do something on building energy conservation,which is significant for improving the environment problems.This paper made some studies in the aspect of building envelope reconstruction,solar energy utilization on the wall implanted with heat pipes,solar heating system and the synthetically utilization of the three in order to reduce the building energy consumption.Firstly,a building in countryside under typical Beijing climate was chosen as the research object,the heat transfer situation of building envelop was analyzed and a material EPS was used on the reconstruction of the building external thermal insulation.A one-dimensional transient heat and moisture transfer model and an economic model was developed.The best thickness of external thermal insulation materials was calculated with MATLAB program,with the change of materials' thermal conductivity coefficient caused by heat and moisture transfer under considered.The energy saving rate and pollution reduction efficient was analyzed further.The result showed that,compared with the situation of no thermal insulation materials,it can reduce 38.5% energy consumption and 37.5% pollution emission in the life cycle of thermal insulation materials.With the best thickness of external thermal insulation materials,the heat diffusion in southern wall implanted with heat pipes was analyzed.Based on this,the heat transfer of heat pipes was simplified and calculated.The results was consistent with the experiments from papers.Then,a two dimensional transient heat transfer model of the wall was developed,which condenser section of heat pipes was seen as heat source.The inner surface temperature and heat flux of southern wall with the best thickness of external thermal insulation materials was calculated by MATLAB progress,and the energy consumption of this structure was analyzed.Lastly,based on the best thickness of external thermal insulation materials,several heating methods was analyzed in economic and emission performance and a solar heating system with heat pumps was presented to support the house heating.And economic optimizing calculation of the two important sections,solar collectors and heat storage tanks,were made.The results of energy conservation and emission reduction calculation showed that the two method can decrease 76.4% of energy use and 70.2% of pollution emission.