Study On Indoor Heat Gain Of Membrane Structure Workshops In Different Areas

In recent years,China's environmental pollution is serious,especially the environmental pollution problem represented by haze,which has become the key target of environmental governance in China.The problem of stacking of open-air materials has become one of the main sources of open source,so solving the problem of stacking of open-air materials has become the top priority of environmental governance.With the popularization of membrane structure construction,the problem of open storage of materials has found an effective solution,and also reduces the loss of materials during storage and the cost of storage.Compared with the steel structure,the membrane structure has the advantages of low cost,short construction period,light weight and environmental protection,which makes the membrane structure develop rapidly.However,due to the high transmittance of the membrane,the solar radiation has a great influence on the indoor thermal environment of the membrane structure plant,and the research at home and abroad is lacking.Therefore,this paper takes the summer indoor heat radiation of membrane structure workshop as the research starting point,comprehensively analyzes the heat gain of the membrane structure industrial plant in the representative cities of the country,and proposes the influence of the structural size of the plant on the indoor heat gain.Firstly,a rectangular membrane structure workshop is taken as the research object,and the representative city of the radiation partition and the radiation intensity calculation model are determined.Secondly,according to the characteristics of the surface structure,the surface structure equation is determined,and the finite element is divided by the MATLAB software.Finally,by establishing the radiation model of thecurved surface and the vertical plane,and using MATLAB programming,the optimal mesh when dividing the grid is determined,and the solar radiation heat of the curved membrane structure building is studied and calculated.The MATLAB numerical simulation method is used to study the indoor heat gain of this type of membrane structure closed plant.By analyzing the changes in solar radiation intensity in various regions of the membrane structure,it is concluded that:(1)In one day's radiation intensity,direct radiation accounts for about 66% of the total radiation.However,in the early morning and evening,the intensity of the scattered radiation accounts for about 70% of the total radiation.(2)The direct radiation,scattered radiation and ground reflected radiation of the vertical film wall accounted for 58%,22%,and 20% of the total radiation,respectively.(3)The heat gain of a curved roof is the main source of heat from the sun,accounting for up to 75% of the total heat.(4)The latitude and longitude of different regions have an effect on solar radiation,but the influence of latitude is greater.(5)During the period from 10:00 to 15:00,the unit's calorific value is above 100W/m2,and the unit calorific value at 13:00-19:00 is slightly larger than the unit calorie at 8:00-12:00.By studying the effects of different membrane and plant structural dimensions on the variation of solar radiation intensity,it is found that:(1)the permeability and absorption rate of the membrane have a linear correlation with the radiant heat,but the effect of transmission on radiant heat is more Bigger.(2)In the case of the same arch height,the greater the span ratio,the smaller the total heat gain of the plant,and the greater the unit's heat gain.(3)In the case of the same span,the larger the span ratio,the smaller the total heat gain of the plant,and the smaller the unit heat gain.In this paper,the research on indoor thermal radiation of membrane structure plant has provided reference for the design of indoor thermal environment of membrane structure closed plant.