ISEC2005-76140 ...... (7)-4

NUMERICAL STUDY OF CONJUGATE HEAT TRANSFER IN A BIPV-THERMAL SYSTEM (7)-4绿色建筑博客u%iH
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^7kzr6u,f"}ZT8u0RESULTS AND ANALYSIS

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PV Temperature Prediction绿色建筑博客I%A9Q~5hnF.]

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    The average convective heat transfer coefficient is calculated to be 5.8 W/m2K for the PV panel and 8.6 W/m2K for the insulation (average of the two is 7.1 W/m2K). The heat transfer coefficients are well validated for the velocity range from 0.3 m/s to 0.6 m/s and ambient temperatures from -10 ℃ to 10 ℃. The radiation heat transfer coefficient is 4.8 W/m2K. These values are substituted into the modified 1-D model [6, 7] to predict the PV and insulation temperatures. The 1-D model with two different convective heat transfer coefficients [7] predicted by the two-dimensional CFD model is used to calculate the surface temperature for PV panel and insulation. Table 1 shows the comparison of predicted temperatures and experimental data for several days in Montreal, Canada. The predicted temperatures match the experiment within 2℃.     Integrating the convective heat transfer coefficient profiles with the two-dimensional model by Charron and Athienitis [6] local PV cell temperatures are calculated as shown in Fig. 9. The ambient conditions on March 29th, 2004 are used in the 2- D model and the calculated PV and insulation temperature profiles are compared with the experimental data on that day. The PV panel and insulation are divided into 9 control volumes and solved with the finite volume method (upwind scheme). The model results shown match the experimental data within 3 ℃.