9-86 Flat-plate solar collectors are often tilted up toward the sun in order to intercept a greater amount of direct solar radiation. The tilt angle from the horizontal also affects the rate of heat loss from the collector. Consider a 1.5-m-high and 3-m-wide solar collector that is tilted at an angle 0 from the horizontal. The back side of the absorber is heavily insulated. The absorber plate and the glass cover, which are spaced 2.5 cm from each other, are maintained at tempera- tures of 80°C and 40°C, respectively. Determine the rate of heat loss from the absorber plate by natural convection for 0 = 0°, 30°, and 90°.

9-86 Flat-plate solar collectors are often tilted up toward the sun in order to intercept a greater amount of direct solar radiation. The tilt angle from the horizontal also affects the rate of heat loss from the collector. Consider a 1.5-m-high and 3-m-wide solar collector that is tilted at an angle 0 from the horizontal. The back side of the absorber is heavily insulated. The absorber plate and the glass cover, which are spaced 2.5 cm from each other, are maintained at tempera- tures of 80°C and 40°C, respectively. Determine the rate of heat loss from the absorber plate by natural convection for 0 = 0°, 30°, and 90°.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

Question

9-86 Flat-plate solar collectors are often tilted up toward
the sun in order to intercept a greater amount of direct solar
radiation. The tilt angle from the horizontal also affects the
rate of heat loss from the collector. Consider a 1.5-m-high and
3-m-wide solar collector that is tilted at an angle 0 from
the horizontal. The back side of the absorber is heavily
insulated. The absorber plate and the glass cover, which are
spaced 2.5 cm from each other, are maintained at tempera-
tures of 80°C and 40°C, respectively. Determine the rate of
heat loss from the absorber plate by natural convection for
0 = 0°, 30°, and 90°.
Glass
cover
Solar
radiation
40°C
80°C
Absorber
plate
Air space
Insulation
FIGURE P9-86

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