Numerical modelling of effect of channel width on heat transfer and ventilation in a built-in PV-Trombe wall

7th European Thermal-Sciences Conference

Su, Yaxin^1 ; Zhao, Bingtao^2 ; Lei, Feining^1 ; Deng, Wenyi^1

School of Environment Science and Engineering, Donghua University, Shanghai, China^1

School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, China^2

关键词: Air flow-rate;    Channel height;    Channel widths;    Electricity efficiencies;    Modified Rayleigh;    Multivariable regression analysis;    Natural convective heat transfers;    Ventilation rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032069/pdf
DOI  :  10.1088/1742-6596/745/3/032069

来源: IOP

【 摘 要 】

The heat transfer and air flow rate in a built-in PV-Trombe wall with vertical inlet were numerically simulated based on CFD method. Effect of channel width on heat transfer and air flow rate was discussed. As the channel width increased, the natural convective heat transfer was enhanced and the PV surface was better cooled by the air which improved the PV electricity efficiency slightly. The ventilation rate through the built-in PV-Trombe wall reached its maximum at an optimal ratio of the channel width to the channel height, (b/H)opt=1/5. Dimensionless expressions to calculate the averaged heat transfer coefficient, Nusselt number, and the air flow rate in term of a Reynolds number were correlated according to a modified Rayleigh number by multivariable regression analysis.