Experimental And Simulation Research On Thermal Performance Of Double Skin Facade In Winter

Double skin facade(DSF) is an advantage facade system, whose working patterns varying depend on the meteorological parameters. The DSF not only has the advantages of aesthetics and fashion, but also has the widely recognized advantage of energy saving. There are many factors affecting the thermal performance. If built improperly, it will increase the energy consumption. At present, the domestic research of double skin facade is mainly on the summer thermal performance and energy saving, The research on the energy saving rate of DSF patterns in winter is less involved yet. A study is performed in this paper that to establish a complete and relatively accurate transient heat transfer and energy calculation models of DSF buildings in Changsha in winter to provide guidance for engineers...Firstly, two kinds of working patterns of DSF in winter is introduced—ventilated pattern and sealed pattern. The comparative experimental research of the two patterns is analyzed through a DSF lab in Changsha, and some discusses is made on whether the shading devices can play a role in winter.Then, the air flow in cavity is simplified as a one-dimensional model, the zonal model based on the principle of energy balance is used to simulate the two DSF patterns in winter. the validity of the model is conducted using test data from the test rooms. The heat transfer coefficient, which is the key factor for the accuracy of the model, is analyzed, Study results show that the model for DSF thermal performance calculation is user friendly and the simulation error is acceptable.Finally, a method is introduced to calculate the heat gain through the facade. The formula is put forwards to calculate the utilization of solar radiation. And the energy consumption of ventilated pattern and sealed pattern is compared. The effect of different of glass, orientation,distance of cavity and indoor temperature is also discussed. An optimal pattern of DSF in winter is proposed in the end and the heat gain is transformed to the cold load by the cold radiation coefficient method. It can be concluded that the southward DSF of optimal pattern can save energy by 27 percent compared with sealed pattern and by 40 percent compared with ventilated pattern through working time.