Study On Thermal Performance Optimization Of Urban Residential Thermal Collector Components And Storage Components In Solar Enrichment Area~*

Reducing the heating energy consumption of urban residences in winter is one of the key point of China's energy conservation.Lhasa,located in the Tibet plateau,is cold and long in winter.There is a high demand for heating energy in winter.However,there is a shortage of fossil energy,such as coal,oil and natural gas.Therefore,relying on fossil energy for residential heating not only has high heating costs,but also has a fatal impact on the ecological environment.How to reduce the energy consumption without destroying the local ecological and improve the indoor thermal environment quality is a hot spot of research by experts and scholars at home and abroad.Passive solar heating utilization is considered as the most effective and feasible way.However,the strong solar radiation in passive solar heating will cause a large fluctuation in indoor air temperature,which affects the indoor thermal comfort level,so it is necessary to find a proper balance between thermal collector components and storage components in order to create a better thermal environment.In this paper,taking the Lhasa area as an example,the simulation software Energyplus is used to simulate the related parameters that affect the heat storage of the building.On this basis,the temperature adjustment potential of the thermal collector components and storage components of urban residential buildings in Lhasa is determined.The specific research work includes the following aspects:Firstly,based on the analysis of the thermal process of the thermal collector components and storage components,the mechanism of the thermal collector components and storage components on the indoor thermal environment is studied.and the related factors affecting the heat collect and storage performance are summarized,and the evaluation index of the heat collect and storage effect of the passive solar house is put forward by " uncomfortable degree hours of heating period ",which can be used for the evaluation of the heat storage effect of the passive solar house.It reflects the degree and duration of indoor air temperature deviating from comfort zone.Secondly,based on the field survey information,the Lhasa urban residential foundation model is established.Through the simulation software Energyplus,the area ratio of window and wall,the number of window glass,the position of insulation layer,the type of wall material,the thickness of wall and so on are analyzed,and the relation curves of these factors and uncomfortable degree hours of heating period are given.Finally,18 combinatorial simulation tests are carried out on 7 important factors affecting the thermal collector components and storage components by orthogonal test,and the main and secondary relationships of the factors affecting uncomfortable degree hours of heating period are obtained.They are as follows: insulating layer position > material type > window wall area ratio > glass layer > thickness of external wall > additional thermal storage component thickness > inner wall thickness,and gives the optimum combination of heat storage components with the minimum number of uncomfortable degree hours of heating period: window wall area ratio 0.6,glass layer number 2 layer,outer wall thickness 0.37 m,inner wall thickness 0.37 m,the concrete hollow block,external heat preservation,additional thermal storage component thickness 0.11 m.Under this situation,uncomfortable degree hours of heating period is 351.6.h.This paper lays a foundation for quantitative study on the temperature adjustment of thermal collector components and storage components in buildings,and it provides a theoretical basis for the passive solar heat utilization in the solar enriched area.