Simulation Study On Optimization Design Of Double Skin Facade In Hot Summer And Cold Winter Zones

Double skin facade system (DSF) not only has the advantages of theconventional single skin facade, such as aesthetics, transparent, fasion and so on, butalso has the widely recognized advantage of energy saving. As a new kind of buildingenvelop which utilizes the soloar energy passively, DSF is considered as green technology. However, the research on DSF is still on an immature stage both in Chinaand abroad, which means there are still no complete theoretical model and simulationmethods which can be easily applied in practical projects. This paper performed astudy to figure out the energy performance of DSF equipped by buildings located inthe hot summer and cold winter zones of China, the main content of this paper are asfollows.Firstly, based on the solar radiation related theories and models, the thermalprocess of DSF is analyzed. The calculation process of the solar optical parameters o fevery single component of DSF (including the single class, coated glass andsun-shading blind, etc.) is reported, and the optical model of DSF is establishedfinally.Sencondly, based on the energy conservation law and the relevant principles ofthe fluid dynamics, heat thranfer model and Multi-zone Airflow Network model ofDSF are constructed in this paper. The heat transfer process from the exterior to theinterior is considered in the heat transfer model, in which the heat transfer variationalong the height direction is also taken into account. The impact laid on theventilation airflow by the blind is considered in the Multi-zone Airflow Networkmodel. Furthermore, several coupled solutions among the two models mentionedabove are introduced.Thirdly, based on the application of the Airflow Network model and the wholebuilding energy simulation tool–Energyplus, a simulation method for DSF isintroduced in this paper. Then the influences of naturally ventilation, sun-shading andopening type laid on the thermal performance of double skin facade are discussed.Finally, a building equipped with typical DSF in Changsha (hot summer and coldwinter climate condition) is selected as a study case, and then the dynamic loadsimulation model is established for it. Then, structural optimizations of DSF areconducted mainly in four aspects, including sun-shading angle, cavity spacing, glazing type, and building orientation. The annual energy consumption is chosen as anindicator to obtain some guidelines for the application of DSF under hot summer andcold winter climates.The conclusions drawn by this paper indicates that DSF is one of suitablebuilding envelops for hot summer and cold winter zones, and it can provide a largeenergy conversation by reasonably design and dynamic adjustment.