Solar radiation is incident on the glass cover of a solar collector at a rate of 700W/m². The glass of collector absorbs 88 percent of the incident radiation on it and has an emissivity of 0.9. The entire hot water needs of a family can be provided by a single collector of 1.2m height and 2m width. The temperature of the glass cover of the collector is measured to be 35C° on a day when the surrounding air temperature is 25C° and the wind is blowing at 30km/h. The effective sky temperature for radiation exchange between the glass cover and the open sky is -40C°. Water enters the tubes which attached to the absorber plate at a rate of 1kg/min. Assuming the back surface of the absorber plate to be heavily insulated and the only heat loss to occur through the glass cover, determine (a) the total rate of heat loss from the collector, (b) the collector efficiency, which is the ratio of the amount of heat transferred to the water to the solar energy incident on the collector, and (c) the temperature rise of water as it flows through the collector. Air 25°C Tsky = -40°C Solar collector 135°C Solar radiation
Solar radiation is incident on the glass cover of a solar collector at a rate of 700W/m². The glass of collector absorbs 88 percent of the incident radiation on it and has an emissivity of 0.9. The entire hot water needs of a family can be provided by a single collector of 1.2m height and 2m width. The temperature of the glass cover of the collector is measured to be 35C° on a day when the surrounding air temperature is 25C° and the wind is blowing at 30km/h. The effective sky temperature for radiation exchange between the glass cover and the open sky is -40C°. Water enters the tubes which attached to the absorber plate at a rate of 1kg/min. Assuming the back surface of the absorber plate to be heavily insulated and the only heat loss to occur through the glass cover, determine (a) the total rate of heat loss from the collector, (b) the collector efficiency, which is the ratio of the amount of heat transferred to the water to the solar energy incident on the collector, and (c) the temperature rise of water as it flows through the collector. Air 25°C Tsky = -40°C Solar collector 135°C Solar radiation
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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Transcribed Image Text:Solar radiation is incident on the glass cover
of a solar collector at a rate of 700W/m². The
glass of collector absorbs 88 percent of the
incident radiation on it and has an emissivity of
0.9. The entire hot water needs of a family can be
provided by a single collector of 1.2m height and
2m width. The temperature of the glass cover of
the collector is measured to be 35C° on a day
when the surrounding air temperature is 25C° and
the wind is blowing at 30km/h. The effective sky
temperature for radiation exchange between the
glass cover and the open sky is -40C°. Water
enters the tubes which attached to the absorber
plate at a rate of 1kg/min. Assuming the back
surface of the absorber plate to be heavily
insulated and the only heat loss to occur through
the glass cover, determine (a) the total rate of
heat loss from the collector, (b) the collector
efficiency, which is the ratio of the amount of
heat transferred to the water to the solar energy
incident on the collector, and (c) the temperature
rise of water as it flows through the collector.
Tay= -40°C
Solar
collector
35°C
Air
Solar
25°C
radiation
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