A Two-Dimensional Model of a Double-Façade With Integrated Photovoltaic Panels

2005 ◽  
Vol 128 (2) ◽  
pp. 160-167 ◽  
Author(s):  
R. Charron ◽  
A. K. Athienitis
Keyword(s):  
Control Volume ◽  
Cost Effective ◽  
Two Dimensional ◽  
Transfer Coefficients ◽  
Air Velocity ◽  
Heat Transfer Coefficients ◽  
Pv Systems ◽  
Air Temperatures ◽  
Building Integrated Photovoltaic ◽  
Convective Heat Transfer Coefficients

Building integrated photovoltaic (PV) systems that include heat capture are more cost effective than PV systems that generate only electricity. This paper presents a two-dimensional control-volume model for a double-façade with integrated PV. The model may be employed to determine maximum PV temperature. Good agreement with a one-dimensional analytical model is obtained for air temperature rise. Experiments in Montreal showed that air temperatures could increase by 20°C when passing air through a 1m high façade section, and maximum PV temperatures of close to 50°C could be reached even in −17°C weather for an air velocity of 0.6m∕s. The highest uncertainty in PV temperature prediction is due to the values of convective heat transfer coefficients from the literature which are generally lower than observed values.

scholarly journals Heat Transfer and Flow on the Blade Tip of a Gas Turbine Equipped With a Mean-Camberline Strip

2001 ◽  
Vol 123 (4) ◽  
pp. 704-708 ◽  
Author(s):  
A. A. Ameri
Keyword(s):  
Heat Transfer ◽  
Sharp Edge ◽  
Tip Leakage Flow ◽  
Transfer Coefficients ◽  
Large Power ◽  
Tip Leakage ◽  
Numerical Heat Transfer ◽  
Heat Transfer Coefficients ◽  
Blade Tip ◽  
Convective Heat Transfer Coefficients

Experimental and computational studies have been performed to investigate the detailed distribution of convective heat transfer coefficients on the first-stage blade tip surface for a geometry typical of large power generation turbines (>100 MW). In a previous work the numerical heat transfer results for a sharp edge blade tip and a radiused blade tip were presented. More recently several other tip treatments have been considered for which the tip heat transfer has been measured and documented. This paper is concerned with the numerical prediction of the tip surface heat transfer for radiused blade tip equipped with mean-camberline strip (or “squealer” as it is often called). The heat transfer results are compared with the experimental results and discussed. The effectiveness of the mean-camberline strip in reducing the tip leakage and the tip heat transfer as compared to a radiused edge tip and sharp edge tip was studied. The calculations show that the sharp edge tip works best (among the cases considered) in reducing the tip leakage flow and the tip heat transfer.

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