Research On Suitability And Simplified Calculation Of Double Skin Facade

In the current social environment,people have multiple demands for aesthetics,comfort,and energy saving.Therefore,double skin facade has become an increasingly popular new envelope structure.But architects don’t know enough about their thermal performance and energy consumption performance.Therefore,it is necessary to establish a complete set of dynamic simulation methods or simplified calculation methods.Which can be used conveniently,save the calculation time and satisfy the accuracy of engineering applications,and it can not only evaluate its thermal performance,but also evaluate its energy consumption performance.Moreover,the developed calculation program can be re-developed,so that the developed calculation program module can be coupled with the existing energy consumption calculation platform for calculation.In this paper,a regional method,combined with the optical model of direct dispersion,is used to complete the dynamic simulation of double skin facade,and a calculation program is developed.This paper studies the climate adaptability of double skin facade in various climatic regions in China.The parameters affecting the double skin facade are divided into regions,and a simplified method for calculating the thermal performance of the double skin facade is proposed.The developed double skin facade calculation program module was coupled with the energy consumption calculation platform De ST,and joint calculation was completed.According to the relevant radiation angle and the calculation method of the direct radiation and scattered radiation received by the double skin facade,a radiation calculation model for a double skin facade was developed.The radiation received by the wall was divided into direct radiation and scattered radiation for processing,and a radiation calculation model of multilayer glass was developed using the net radiation method.In addition,a radiation calculation model of a sunshade is developed in combination with the property that the sunshade can reflect direct radiation and scatter the direct radiation.The energy conservation equation is established by the regional thermal equilibrium method,and the cavity airflow model is established by combining the airflow network method and Bernoulli’s equation.Combined with the radiation calculation model,a calculation model of double skin facade with louvers and external ventilation was established.The typical cities in five climatic regions of China are selected,and the typical annual meteorological parameters of summer and winter load calculation days of each typical city are used as input conditions to calculate the heat gain of the double skin facade of various structures and operating modes,and the heat gain of the double glazing facade with externalvenetian blind.The calculation results are compared,and the structure and operating mode of the double skin facade that is most suitable for use in each climate zonal and direction are obtained.The thermal performance of the double skin fa?ade with the optimal performance is compared with the thermal performance of the double glazing facade with external venetian blind.Although the thermal performance simulation calculation model of the double skin fa?ade established in this paper is already a very simple calculation model,if there is no calculation software for this model,it is still difficult for engineers to calculate in engineering applications.In order to assist engineering technical personnel and researchers to more easily realize the calculation and analysis of the thermal performance of double skin facade,this article takes the interior side of the double skin facade as an example,and finds the influence of the thermal performance of double skin facade through a developed calculation program.the parameters that affect the thermal performance of double skin facade are simulated in sections and plotted as a parameter performance table.A simplified calculation method for the thermal performance of double skin facade by interpolation is given.Using the meteorological parameters of July 21 in a typical year in Changsha and Shanghai respectively as input,two calculation methods were used to calculate the radiation heat gain and convective heat gain of the double skin facade and the calculation results were compared.The results show that the calculation results of the two methods are close,the maximum relative error of radiation heat gain does not exceed 0.5%,and the maximum relative error of convective heat does not exceed 3%,can be applied to actual projects.The functional verification,theoretical verification,static code detection and dynamic code detection of the double skin facade calculation module program independently developed in this paper are completed,and the independently developed double skin facade calculation module program is coupled with the De ST energy consumption calculation platform.Interface design.The double skin facade calculation module dsf FMU developed was independently debugged and jointly debugged with the De ST energy consumption calculation platform.The correctness of the interface design was verified by comparing the calculation results of the independent debugging and the calculation results of the joint debugging.The results of joint debugging calculations with a time step of 1 hour and a time step of 15 minutes are compared to verify the correctness of the small step of the dsf FMU and De ST energy calculation platform when combined.A joint calculation case for a single room in Beijing and a calculation case for a three-story villa in Beijing were designed through the De ST energy consumption platform,and the indoor temperature and indoor load of the target room were calculated.