Experimental Study On Thermal Performance And Indoor Thermal Comfort Of Double-Layer Photovoltaic Windows

In recent years,with the continuous improvement of the quality requirements of human settlements,building energy consumption has increased rapidly.Translucent photovoltaic exterior windows as a typical form of photovoltaic integrated building(Building Integrated Photovoltaic,BIPV)technology,has the advantages of reducing building air conditioning load,reducing indoor glare risk,and outstanding energy saving potential.It is considered to be an effective means to achieve building energy efficiency.Due to the photoelectric effect,the translucent photovoltaic outer window can absorb part of the solar radiation and convert it into electrical energy,but it also causes the light and heat transfer process of the translucent photovoltaic window to be completely different from the ordinary white glass outer window.Correspondingly,the construction process of the indoor thermal environment of the translucent photovoltaic exterior window building is also quite different from the ordinary white glass exterior window building.However,there is currently no research on the indoor thermal environment comfort of translucent photovoltaic exterior windows.Therefore,in order to study the thermal performance and indoor thermal comfort of double-layer photovoltaic external windows,firstly,by constructing two rooms with the same size and structure,we will study the double-layer photovoltaic external windows and double-layer under cold conditions in summer conditions.The surface temperature distribution of the white glass exterior window analyzed the differences in the building indoor thermal environment construction process;secondly,the method of combining on-site subjective questionnaire survey and actual measurement of environmental parameters,through the skin temperature test and subjective questionnaire survey of 32 subjects,Comparing the difference in the indoor thermal environment construction process between the double-layer photovoltaic external window building and the double-layer ordinary white-wave external window building on the thermal comfort of the human body;finally,combining the indoor thermal environment distribution characteristics of the translucent photovoltaic window building and the subjective evaluation of human thermal comfort As a result,the indoor thermal comfort evaluation model of translucent photovoltaic exterior window buildings was studied,and based on the two-node model thermal comfort evaluation index standard effective temperature(SET~*),a thermal comfort prediction model suitable for photovoltaic exterior window environment was proposed.The results of this study show that:(1)There are significant differences in surface temperature and indoor temperature distribution between the double-layer photovoltaic external window and the double-layer ordinary external window: the temperature of the outer photovoltaic glass of the double-layer photovoltaic outer window is greater than the temperature of the inner white glass,while the temperature of the double-layer ordinary outer window The temperature of the inner white glass is greater than the temperature of the outer white glass;the maximum temperature difference between the outer surface of the double-layer photovoltaic outer window and the double-layer ordinary outer window is 4.1℃,and the maximum temperature difference of the inner layer surface is 1.8℃;The vertical temperature is different,but the indoor average temperature of the double-layer photovoltaic external window room is lower than that of the double-layer ordinary window room,and the indoor temperature field distribution of the double-layer photovoltaic window building is more uniform.(2)In summer,the average thermal sensation voting value of rooms with different external windows is greater than 0,but the average thermal sensation voting value of ordinary external window rooms is greater than that of photovoltaic external window rooms,indicating that under the same outdoor conditions,photovoltaic windows The indoor thermal comfort is more excellent.(3)For the indoor environment of photovoltaic exterior windows in summer,the difference between the predicted value of the PMV model and the actual thermal perception voting value is large,and the maximum difference is 1.5,indicating that the PMV model may not be suitable for the prediction of human thermal comfort in the environment of photovoltaic exterior windows.Therefore,based on the standard effective temperature SET~*,a PTS model suitable for human thermal comfort evaluation of translucent photovoltaic buildings is proposed,and the reliability of the model is verified by experimental results.