Passive Precooling And Preheating Strategy Based On Spatial Layer Of Building Thermal Buffer

The writing framework of this paper can be divided into four steps,corresponding to the content of the first four chapters respectively.The first chapter is the introduction to put forward passive precooling and preheating and spatial layer,which illustrates the necessity of research.In the second chapter,according to the problems of the first chapter,theoretical research is carried out from two aspects of space and precooling and preheating.In terms of space level,the cavity space is studied firstly,and the space theory of the cavity and the regulating effect of thermal buffer are summarized.According to the binary distribution of primary and secondary space,the spatial hierarchy can be divided into six types: core spatial layer,inner corridor spatial layer,outer corridor spatial layer,north-south spatial layer,surrounding spatial layer and vertical spatial layer.In terms of passive precooling preheating,combining common passive heating and cooling technology,according to different cooling and heat sources,the passive cooling can be divided into the night sky radiation type passive precooling,material storage type passive precooling,earth cool storage type passive precooling and passive evaporative cooling,Passive preheating can be divided into solar passive preheating and earth regenerative passive preheating.In chapter 3,as a quantitative study,this paper conducts De ST software simulation analysis for typical passive precooling and preheating methods,including passive precooling simulation of the north facade,passive preheating simulation of the south facade and passive precooling simulation of the basement.On this basis,the general steps of precooling and preheating are put forward,that is,selecting precooling and preheating chamber,and then designating reasonable ventilation path for precooling and preheating.In this paper,the energy saving value of passive precooling and preheating is proved by software simulation,and the optimization simulation is carried out,and the possibility of technical optimization is proposed.The fourth chapter combines qualitative and quantitative analysis and puts forward the optimization strategy of passive precooling and preheating from the technical level and space level respectively.At the technical level,based on the simulation results,a technical optimization strategy was proposed from the aspects of cavity heat capacity,size,ventilation volume,maintenance structure and winter/summer mode.In terms of spatial level optimization,passive precooling and preheating optimization of six spatial level types summarized in Chapter2 is carried out.On this basis,three common cavity optimization techniques are summarized:additional elevation cavity optimization,embedded cavity optimization,and vertical cavity optimization.At the same time,according to the distribution law of temperature space,the passive precooling and preheating optimization prototype is proposed.Finally,as the deepening of cavity space layout,the precooling and preheating analysis of distributed cavity,combined cavity and integrated cavity are carried out.