Sustainable Energy
Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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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.
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.
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.
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