Research On The Performance Of A Novel Miniature Transmissive Solar Concentrator

Solar energy is a clean and environmentally friendly energy source,it has attracted more and more attention with the depletion of conventional energy sources.Buildings consume huge amounts of energy,and the application of BIPV in modern buildings provides a new way for humans to develop renewable energy.When using solar energy to provide building energy consumption,it is not only required to be able to meet the lighting requirements of different time periods,but also need to generate high-grade thermal energy.The novel miniature transmissive solar concentrator proposed in this paper is one of the ideal devices to achieve these requirements,and then a novel miniature transmissive solar concentrating system composed of it is proposed.The design of the novel miniature transmissive solar concentrator adopts a hollow structure,and the hollow part is filled with liquid medium.The ray tracing method was first used to complete the optical path simulation of a single micro-concentrating unit and multiple micro-concentrating units;and only on the wall surface of the concentrator partial light entrance,only light removal in the condenser with partial wall entrance,and light path simulation of micro-concentrating units with different wall thicknesses;then several other different structural forms are also compared,including solid CPC structure,trapezoidal structure,circular fluid structure,and the optical path simulations were made and comparison results were obtained.The novel miniature transmissive solar concentrator was has significant advantages: It can have a good reception rate for the bottom receiver of light in a small angle of incidence angle range,and also has a passive light control function.An integrating box transmittance experimental device was designed based on the integrating sphere principle.The micro-concentrating unit was placed in the north-south or east-west direction,and the illuminance value in the integrating box in a day with novel miniature transmissive solar concentrating system covered or not,then calculated by calculating the transmittance.A double-layer vacuum glass cover with the same size was selected to comparison experiment.Then,installed a PV cell at the bottom of the micro-concentrating unit.The power generation efficiency of the concentrating system is obtained through calculation.The results show that at noon in direct sunlight,the transmittance of the novel miniature transmissive solar concentrating system is very low,less than 30%.At this time,most of the light is concentrated by the novel miniature transmissive solar concentrating system on the photovoltaic cells at the bottom of the micro-concentrating unit to generate electricity,power generation efficiency of concentrating system up to 5.45%;and in the morning and afternoon sunlight is not enough when the room still needs daylight,the transmittance of the novel miniature transmissive solar concentrating system can exceed60%.At this time,most of the light can pass through the novel miniature transmissive solar concentrating system then enter the room to meet the lighting needs.Therefore,this novel miniature transmissive solar concentrating can use excess solar energy to obtain additional power,which provides a new way to improve the utilization of solar energy in glass curtain wall systems,the novel miniature transmissive solar concentrating system composed of this novel miniature transmissive solar concentrator is particularly suitable for use in new glass curtain wall systems.