3) The temperature and emissivity of the glass of a flat plate collector with a dth of 1 m and a length of 1.8 m are 40°C and 0.9, respectively. The absorber plat painted with matte black paint and the temperature of the plate is 80°C. Th issivity and absorptivity of matte black paint are equal to each other and are 0. e absorber plate is then coated with selective material with emissivity an orptivity of 0.2 and 0.9, respectively. In this case, by what percentage does the ount of heat from the plate change?
3) The temperature and emissivity of the glass of a flat plate collector with a dth of 1 m and a length of 1.8 m are 40°C and 0.9, respectively. The absorber plat painted with matte black paint and the temperature of the plate is 80°C. Th issivity and absorptivity of matte black paint are equal to each other and are 0. e absorber plate is then coated with selective material with emissivity an orptivity of 0.2 and 0.9, respectively. In this case, by what percentage does the ount of heat from the plate change?
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Transcribed Image Text:3) The temperature and emissivity of the glass of a flat plate collector with a
dth of 1 m and a length of 1.8 m are 40°C and 0.9, respectively. The absorber
plat painted with matte black paint and the temperature of the plate is 80°C. Th
issivity and absorptivity of matte black paint are equal to each other and are 0.
e absorber plate is then coated with selective material with emissivity an
orptivity of 0.2 and 0.9, respectively. In this case, by what percentage does the
ount of heat from the plate change?
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