Research On New Type Of Photovoltaic Thermal Curtain Wall

Building integrated photovoltaic(BIPV) is a new concept of the application of solar energy. An important application of BIPV is photovoltaic curtain wall which present the development direction of international solar building intergration technology. However, solar energy has not been fully utilized in the operation system because of the photovoltaic generation power decreased with the increasing temperature. Not only lead to increase cold load in summer directly but also influence service life because of the temperature of system is high in the actual operation of the photovoltaic curtain wall system. It must be a great significance of study on the comprehensive utilization of solar energy if there is a method not only can improve the photovoltaic generation power but also can utilize solar energy more.The micro heat pipe array(MHPA) that has a characteristics of high efficient heat transfer. Introduce the MHPA into the traditional photovoltaic curtain wall, which formed the new type of curtain wall system-micro heat pipe array-building integrated photovoltaic/thermal(MHPA-BIPV/T) can put the heat produced by photovoltaic into the sink quickly, then reduce the temperature of photovoltaic through the cooling medium circulation. It can improve the photovoltaic generation power meanwhile recyce the excess heat in order to achieve the purpose of cogeneration.Because of the particularity structure of curtain wall, both the transparent and non-transparent curtain wall components are considered.First of all, an experiment test has been made of MHPA-BIPV/T wall system. The result shows that the average PV/T photovoltaic power efficiency of transparent wall component is 9.8%, which the PV is 9%, the average PV/T efficiency power of non-transparent wall component is10.3%., which the PV is 9.9%. It also shows that the average thermal efficiency of PV/T transparent wall system is 47% which the nontransparent is 37%. The total efficiency of transparent wall system is about 51% which the non-transparent is 39%. Thus it can be seen that the MHPA-BIPV/T wall system improve the utilization rate of solar energy greatly.Secondly, establish the numerical model of the MHPA-BIPV/T module and the verification. Generating grid for computational region and make an encryption processing in the water pipe heat exchanger in GAMBIT. Pressure-celocity coupling equation using SIMPLE algorithm and the momentum, energy and turbulence equation are based on the two-stage upwind scheme in FLUENT.Thirdly, compared with the actual curtain wall engineering. Establish the air channel and closed channel curtain wall system of Xingye company in Zhuhai, through the simulation software FLUENT calculation shows that the average power generation efficiency of the new MHPA-BIPV/T wall sstem is 3.4%, of which the air channel is 3.05% and the closed 2.9%. The average photovoltaic efficiency of the new one is 11.5% higher than the air channel one, and 17.2% higher than the closed channel curtain wall system.Finnaly, make a system opimization of the new MHPA-BIPV/T curtain wall. Analysis the system through the entrance temperature of the cooling medium circulation channel and the number of modules in series system. Result shows that the efficiency of power generation decreased when the entrance temperature is higher and the number of modules in series increased.