Sustainable Energy, SI Edition
Sustainable Energy, SI Edition
2nd Edition
ISBN: 9781337672092
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 9, Problem 12P
To determine

Find the maximum frequency of the light that produces output from a Ge-based photovoltaic cell.

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A 2 x 2 m flat plate solar collector for domestic hot water heating is shown in the figure. The incident solar radiation on the glass cover, which transmits 90% of the incident flux, is 750 W/m2. Water flows through the tubes soldered to the backside of the absorber plate, entering at a temperature of 25°C. The temperature of the glass cover is 27°C, and it radiates heat with an emissivity of 0.92 to the sky at –50°C. Additionally, the glass cover losses heat by convection to air at 20°C flowing over its surface at 30 km/h. Assume that the radiation heat transfer between the absorber plate and glass cover and the heat transfer through the back and sides of the collector is negligible.
1.) It is the equivalent of 1 lumen distributed uniformly over 1 sqft of surface located 1 ft from a standard candle. 2.) It is the one that produces the sensation of light in the human eye. 3.) It is the amount of light which falls on a 1 sqft of surface area when all points on the surface are 1 ft from a standard candle.
i) What is a photovoltaic cell? ii) A certain solar cell type has an output capability of 0.5 A at 0.4Volts. A series / parallel solar array has been designed of such cells with 80 parallel strings and each string has 1500 cells in series. Calculate: (i) Voltage capability (ii) Current capability and (iii) Power output capability of the array.
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