Abstract
A novel transparent roof which is made of solid CPC (Compound Parabolic Concentrator) PV/T/D (Photovoltaic/Thermal/Day lighting) system is presented. It combines the solar PV/T/D system with green building design. The PV/T/D system can achieve excellent light control at noon and adjust the thermal environment in the building, such that high efficiency utilization of solar energy could be achieved in modern architecture. This kind of roof can increase the visual comfort for building occupants; it can also avoid the building interior from overheating and dazzling at noon which is caused by direct sunlight through transparent roof. Optical simulation software is used to track the light path in different incidence angles. CFD (Computational Fluid Dynamics) simulation and steady state experiment have been taken to investigate the thermal characteristic of PV/T/D device. Finally, the PV/T/D experimental system was built; and the PV efficiency, light transmittance and air heating power of the system are tested under real sky conditions.
Highlights
The PV/T/D system can achieve excellent light control at noon and adjust the thermal environment in the building, such that high efficiency utilization of solar energy could be achieved in modern architecture
Research on PV/T/D (Photovoltaic/Thermal/Day lighting) system is a promising topic in solar energy applications, and many studies have been done on conventional solar concentrators
Combining the solar energy PV/T/D system with green building design, a novel transparent roof which is made by solid CPC PV/T/D system is presented
Summary
In order to get the air heating efficiency of PV/T/D system in different air flow rates and different heating power, the CFD (Computational Fluid Dynamics) software has been used to simulate the thermal characteristic. Simulation field of CFD model contain a part outer space of PV/T/D system, in this case, the air flow condition before inlet can be analyzed; the heat exchange between the wall of PV/T/D device and environment can be obtained. 1、the air flow is uncompressible and laminar in device; 2、heat generation only occurs in the PV cell; 3、The air flow rate is zero in environment, nature convection is the only way of heat-exchange on the exterior surface of device. The boundary condition of CFD simulation was set as follow: a. Convergence criteria: Residuals of energy equation is 10-6, others are 10-4
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