e 0.8 and assume n. Take the e temperature as t a film tempera- good assumption?

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e 0.8 and assume n. Take the e temperature as t a film tempera- good assumption? Resistance wire FIGURE P20-33 4 A manufacturer makes absorber plates that are m X 0.8 m in size for use in solar collectors. The back of the plate is heavily insulated, while its front surface coated with black chrome, which has an absorptivity of solar radiation and an emissivity of 0.09. Con- sider such a plate placed horizontally outdoors in calm air at 25°C. Solar radiation is incident on the plate at a rate of 600 W/m2. Taking the effective sky temperature to be 10°C. determine the equilibrium temperature of the absorber plate. What would your answer be if the absorber plate is made of ordinary aluminum plate that has a solar absorptivity of 0.28 and an emissivity of 0.07? Evaluate air properties at a film temperature of 70°C and 1 atm pressure. Is this a good is assumption? Solar radiation 600 W/m2 an appropriate of the room the tempera- nt orientations from 5°C t hot surface board as the Absorber plate a-0.87 ? 0.09 n 2 he and missivity FIGURE P20-34 20-35 Repeat Prob. 20-34 for an aluminum plate painted Hat black (solar absorptivity 0.98 and emissivity 0.98) and also for a plate painted white (solar absorptivity 0.26 and unlunto air nronerties at a film temperature form Nu can be cient

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