Study On Thermal Performance Of A Novel PV-TW With Breathing Pores

At present,there is a serious energy crisis in the world,and the high energy consumption of buildings has aggravated the severe situation of energy crisis.In order to reduce the building energy consumption,the use of new energy in the buildings has been the focus of the world.Among them,the Photovoltaic Trombe wall in the construction of energy-saving emission reduction has been effective.In this paper,a novel Photovoltaic Trombe wall(PV-TW)with breathing pores is proposed,which not only keeps the advantages of the traditional PV-TW,but also improves the shortcomings of the traditional PV-TW.The experimental study and numerical simulation about the new PV-TW have been done.On the basis of building a experimental platform,the experimental contrast of new PV-TW and traditional PV-TW results show that the new PV-TW temperature distribution increases along the vertical direction;temperature near pores was lower than that in other regions.The vertical temperature distribution in PVC is consistent with PC,and the temperature of the two sides of PVC is lower than that near pores due to the special interlayer flow field formed by breathing pores.Under the same experimental conditions,the new PV-TW has better heat dissipation and heat insulation performance than the traditional PV-TW.Based on the analysis and reasonable assumption,a reliable numerical model of photovoltaic wall was established,and some important factors were studied.The results show that the simulation results obtained by the numerical model in this paper could reflect the actual situation of PV-TW in the range of error.The exists of breathing pores enhances heat transfer,reduces PV modules temperature;Appropriate size of breathing pores strengthens heat transfer,improve the photovoltaic wall interlayer ventilation and reduce the heat transfer to indoor;In a certain range,the duct thickness is beneficial to enhancen the heat transfer inside the duct,and the heat transfer coefficient would be reduced by the excessive intercalation.The increase of direct radiation intensity strengthened the heat transfer on the surface of PV-TW.With the increase of radiation intensity,even in the high temperature weather,the new PV-TW still maintained a good heat dissipation capacity of the building.