| This paper proposes a new ventilated double skin fa?ade integrating photovoltaic blinds(PV-Blinds)and introduces the structure and function of the PV-Blinds.Its EnergyPlus model and Ladybug&Honeybee model are established,which are used to simulate the effects of PV-Blinds on the overall energy performace and daylighting performance of building,respectively.A method for simulating the overall energy performace of PV-Blinds by EnergyPlus is put forward.Two angle control strategies for PV-Blinds are put forward,namely,control strategy for the greatest photovoltaic power generation without glare(control strategy 1)and control strategy for the greatest photovoltaic power generation eliminating the block between photovoltaic venetian blinds and indoor glare(control strategy 4),which compare with two other control strategies proposed by other researchers,namely,control strategy for the greast photovoltaic power generation based on the solar profile angle(control strategy2)and control strategy based on without the block between photovoltaic venetian blinds(control strategy 3)about comprehensive energy performance and natural daylighting performance.According to the degree of opening vent of PV-Blinds,three different ventilation modes,namely,natural ventilation mode,buoyancy-driven ventilation mode and non-ventilation mode,can be obtained.The effect of PV-Blinds on comprehensive energy consumption of buildings is analyzed under different ventilation modes.The monthly best ventilation mode for Changsha in Hot Summer and Cold Winter area has been further optimized.In order to clarify the energy saving potential of PV-Blinds for building applications,PV-Blinds is compared with other two ordinary photovoltaic windows,namely ventilated amorphous silicon photovoltaic windows(PV-DSF)and hollow amorphous silicon photovoltaic windows(PV-IGU).The main conclusions of this thesis are as follows:By comparing the effects of PV-Blinds on the comprehensive energy consumption of building in Changsha under the four control strategies,the simulation results show that the air conditioning energy consumption under four control strategies has not much differences,which the cooling energy consumption is148.74kWh?148.10kWh?148.24kWh?149.88kWh,the heating energy consumption is 99.67kWh,101.38kWh,99.53kWh,98.47kWh,and the fan energy consumption is32.12kWh?32.09kWh?31.88kWh?32.14kWh,respectively.The lighting energy consumption under control strategy 4 is the smallest,which is 66.74 kWh,which is reduced by 20.88%?36.39%?23.88%compared with control strategy 1,control strategy 2 and control strategy 3,respectively.The power generation under the four control strategies are 317.68 kWh,293.20 kWh,258.61kWh,and 283.34kWh,respectively.The annual net energy consumption,from high to low,is control strategy3,control strategy 2,control strategy 4,and control strategy 1,which is 308.87kWh?293.45kWh?264.04kWh?247.35kWh,respectively.Since control strategy 4 not only considers that there is no block between photovoltaic venetian blind,but also there is no glare indoor and the power generation is the maximum,it has better practical value compared with other control strategies.In order to analyze the influence of PV-Blinds on indoor daylighting performance under the four control strategies in Changsha,the indoor natural daylighting performance was compared using the indicators of daylighting autonomy(DA)and daylighting glare possibility(DGP).The simulation results find that the DAs of the four control strategies are 10%~60%,10%~50%,30%~70%,50%~90%,respectively.It is seen that PV-Blinds under control strategy 4 has the best daylighting performance.And all DGPs are less than 0.35 under the four control strategies,which is undetectable glare.The effects of PV-Blinds on the overall energy consumption of building in Changsha under three different ventilation modes are compared.The results show that the natural ventilation mode has the lowest cooling energy consumption,which is134.60 kWh,which is 3.80%and 10.19%lower than the buoyancy-driven ventilation mode and the non-ventilation mode,respectively.The heating energy consumption under the non-ventilation mode is reduced by 24.58%and 18.42%compared with the natural ventilation mode and the buoyancy-driven ventilation mode,respectively.The annual power generation of photovoltaic blind under natural ventilation mode,buoyancy-driven ventilation mode and non-ventilation mode are 290.42 kWh?288.14kWh and 283.34kWh,respectively.And the annual power generation per unit area is 145.21kWh/m~2,144.07 kWh/m~2 and 141.67kWh/m~2 under three different ventilation modes.In terms of annual net energy consumption,compared with natural ventilation mode and buoyancy-driven mode,PV-Blinds can save 9.83 kWh and 7.29kWh respectively under the non-ventilation mode.It can be seen that in the Changsha area,when the air cavity of PV-Blinds is 100mm,the best ventilation mode for the whole year is the non-ventilation mode.Further analysis shows that the optimal ventilation mode is non-ventilation mode in January,February,March,November as well as December,natural ventilation mode should be adopted in other months.Comaprison analysis of the impact of PV-Blinds under the natural ventilation mode,PV-DSF under the natural ventilation mode as well as PV-IGU on the overall energy consumption of buildings is conducted.The results shows that in terms of cooling energy consumption,PV-Blinds can reduce cooling energy consumption by5.32%and 17.78%,respectively,compared to PV-DSF and PV-IGU.In terms of heating energy consumption,PV-IGU is 47.25%and 37.88%lower than PV-Blinds and PV-DSF,respectively.For power generation,the PV-Blinds is significantly higher than PV-DSF and PV-IGU due to the difference of solar cells adopted.The annual power generation per unit area is 145.21kWh/m~2,27.26kWh/m~2,44.65kWh/m~2,respectively.By comparing the annual net energy consumption under three photovoltaic windows,it is found that PV-Blinds can save 54.94%and 50.32%of energy compared with PV-DSF and PV-IGU.It can be seen that PV-Blinds has the best energy saving potential. |
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