Performance Experimental Study Of Double-skin Facade Integrated With Photovoltaic Blinds Under Winter Conditions

Energy shortage and environmental pollution facing society today has been becoming two major problems.New energy development and utilization mainly based on renewable energy have become the mainstream of diversified energy structure in the future,and the overall energy consumption ratio of the building is increasing.Under this kind of background,the application of photovoltaic technology in building envelope has been developed continuously because of its unique advantages.This paper combines photovoltaic technology with building envelope,designs a double layer skin curtain wall system of photovoltaic Venetian louver,which can not only play the performance of traditional envelope structure,but also can generate electricity under the effect of solar radiation,for the use of DC and AC load indoors.In order to study the thermal and power generation performance,the experiment was designed and carried out to study the winter working conditions of the system in the hot summer and cold winter area,and the performance test results were obtained,its applicability was analyzed.In this paper,the experimental test scheme for solar radiation,ventilation,temperature distributions and power generation under different solar altitude angles is established,and the performance test platform is constructed according to the scheme.In the process of experiment,the indoor temperature control fail to meet the requirements by the simple air-conditioning heating system,and the indoor air temperature control strategy is studied concretely,a new method of indoor temperature control is obtained.An indoor temperature control method was obtained,and the mechanical ventilation,natural ventilation and airtight operating modes of the system were tested in the winter condition,the power generation and thermal performance of the system were tested separately,the test results of three kinds of operation modes were analyzed.The results of the performance test of the system under winter conditions in hot summer and cold winter area are obtained.The experimental results show that when the new method of temperature is adopted for the refrigeration temperature setting 16 Cand the electric heater power is 1600W,the artificial environment experimental indoor air temperature fluctuation frequency stability,the amplitude of the smallest only 2.5 ?.The thermal performance of PVB-DSF is analyzed by using the solar coefficient,shading coefficient and comprehensive heat transfer coefficient,power generation performance of PVB-DSF was analyzed by output voltage and power.Under mechanical ventilation,natural ventilation,airtight conditions the solar radiation coefficient of heat are 0.31,0.17 and 0.12 respectively.In the hot summer and cold winter area.Indoor environment need heating in winter,with certain energy-saving effect for the beneficial of the indoor temperature increasement;The mean value of the airtight conditions,natural ventilation,mechanical ventilation shading coefficient are 0.18,0.24 and 0.25 respectively;The average value of the comprehensive heat transfer coefficient of PVB-DSF and outer wall in confined condition is 3.24 W/m2·K and 1.54 W/m2·K respectively.The mean value of comprehensive heat transfer coefficient of PVB-DSF and exterior wall are 3.46 W/m2 K and 1.52 W/m2·K under mechanical ventilation condition.The mean value of the comprehensive heat transfer coefficient of PVB-DSF and exterior wall under natural ventilation condition is 3.57 W/m2·K and 1.32W/m2 K;Through the analysis of the temperature gradient of each component,the PV Venetian components temperature has been in the highest,and then the PV louver clearance.The clearance temperature of the louver gap in the middle of PVB-DSF is higher than the temperature of the bottom and upper position clearance;The mean value output voltage and power of the airtight conditions are 12.6V and 3W respectively,the mean value output voltage and power of the mechanical ventilation condition are 10.9V and 1.57W respectively,and the output voltage and power of the natural ventilation condition are 10.14V and 1.54W respectively.