Research On Daylight Environment And Energy Performance Of Building Integrated See-Through Thin Film Photovoltaic Curtain Wall

See-through thin film photovoltaic curtain wall as the new building materials of building skin,improves the quality of indoor daylight environment at the same time blocking solar radiation into the interior space,but also changed the composition of the comprehensive energy system of the building.The thermal and optical properties of see-through thin film photovoltaic curtain wall are two important parameters.The thermal performance is directly related to the energy consumption of heating and cooling.Optical performance is directly related to the quality of indoor daylight environment,lighting energy consumption and output power of the system.Energy consumption of heating,cooling,lighting and output power couples the new energy performance.Mathematical calculation and numerical simulation were used in this paper.First of all,the research focuses on the architectural integration design of see-through thin film photovoltaic curtain wall.Material type and formation principle of see-through thin film photovoltaic cell were analyzed and then put forward the form integration of see-through thin film photovoltaic curtain wall.The aesthetic rules,such us material skin texture,color,form beauty,were systematic analyzed,and combined with typical cases.Secondly,through theoretical calculation,the heat transfer coefficient of four kinds of inner layer glass with different thickness of air layer is compared and analyzed.Select the optimized closed double layer see-through thin film photovoltaic curtain wall as the benchmark model.Through Fluent,the heat transfer coefficient,the cavity temperature field,the velocity distribution of air field was studied in the case of different vents sizes,different heights and different air flow velocity of the inlet of the external respiration see-through thin film photovoltaic curtain walls.The result shows that when the vent is 25 cm and the inlet wind speed is 1.4m/s,the thermal performance of curtain wall is the best.At the same time,the mathematical equation of the different design parameters and the heat transfer coefficient of see-through thin film photovoltaic curtain wall are formed.Thirdly,simulations of the indoor daylight environment linked to the building with see-through thin film photovoltaic curtain wall were carried out.The results show that at least 30% light transmittance of photovoltaic curtain wall should be used in the south,southeast and southwest spaces,and as far as possible 40% light transmittance of photovoltaic curtain wall should be used in the east and west spaces.At the same time,it puts forward a quantitative solution to how to ensure that the space light environment is at least acceptable or the ideal state in the case of the curtain wall transmittance less than this limit values.Finally,a comprehensive energy consumption database of 219 space models with 73 see-through thin film photovoltaic curtain wall models was established.Based on the database,the sensitivity of the design parameters of the see-through thin film photovoltaic curtain wall is studied.Sensitivity analysis results show that,on the whole,the highest sensitivity coefficient is orientation,secondly is the replacement area percentage,thirdly is the visible light transmittance,at last the sensitivity coefficient of the heat transfer coefficient of the curtain wall is the smallest.And according to the energy saving rate,recommended appropriate see-through thin film photovoltaic curtain wall models applicable to the south space,southeast space,southwest space,east space and west space.The paper provides reliable data support for the application of photovoltaic curtain wall.