Sustainable Energy, Si Edition
1st Edition
ISBN: 9781133108771
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 9, Problem 5P
To determine
Find the diameter of a mirror array associated with a solar power tower that would replace a
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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.
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Figure
20%
0.400 m
*
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1 of 1
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Find the magnitude of the electric flux through the sheet.
Express your answer with the appropriate units.
O
Þ= 4.9
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In a parallel electrical circuit, the total current is the sum of the individualcurrents. An air conditioner has a blower and a compressor that are wired ina parallel circuit. The blower draws 1.042 amperes and the compressor draws11.95 amperes of current. When both are operating, what is the total currentdrawn?
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Sustainable Energy, Si Edition
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