Experimental And Simulation Study On Thermal Performance Of Ventilated Double Skin Facade In Hot Summer And Cold Winter Zone

Ventilated double skin facade (VDSF) is transpartent and beautiful and has moreflexible operation modes compared with conventional single skin fa ade. As a result,VDSF has been used in some buildings in recent years in china. However, due to thelack of evaluation tool of VDSF thermal performance, whether VDSF is appropriatefor different climate regions especially in the hot summer and cold winter zone inChina is still inconclusive. This article discussed the optical model, heat transfermodel and air flow model of VDSF successively, aiming to establish a complete andrelatively accurate transient heat transfer calculation model for VDSF to providereference for engineers engaged in related work.Firstly, the effect of solar radiation on the VDSF system is analyzed. Virtualspace model in EnergyPlus is combined with ray tracing method to establish theoptical model of VDSF system, which can calculate hourly absorbed, reflected andtransmitted solar radition energy by VDSF system.Then, heat transfer model is established based on the energy conservation lawand the principles of the fluid dynamics. The model build the heat transfer relventfrom outside to inside by convection.Besides, the relationship of the temperatures atdifferent heights of solid layer (layer glass and blind layer) is built by verticalairflow movement in the cavity, so the model is a special two dimensional calculationmodel.After the complete thermal performance model of VDSF is established, theVDSF experiment platform construction and related experiment design content isintroduced. Take August30,2013in Changsha as the typical day and compare thesimulation results with the experiment data to verify the accuracy of the VDSF model.Finally, use the model to simulate the thermal performance of VDSF underdifferent operating conditions. The effect of different blind angle, ventilation rate,distance of cavity and orientation on the thermal performance of VDSF is analyzed.Then some useful suggestions about VDSF construction design and operation mode inhot summer and cold winter zone are proposed.Study results show that the VDSF thermal performance calculation model isuser-friendly and the simulation error is acceptable. Thus can be used to guide the VDSF structure optimization and formulate reasonable operation mode.