A proposed method for generating electricity fromsolar

Chapter 12, Problem 12.26

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A proposed method for generating electricity fromsolar irradiation is to concentrate the irradiation into a cavity that is placed within a large containerof a salt with a high melting temperature. If all heatlosses are neglected, part of the solar irradiationentering the cavity is used to melt the salt whilethe remainder is used to power a Rankine cycle.(The salt is melted during the day and is resolidifiedat night in order to generate electricity around the clock.)Consider conditions for which the solar power enter-ing the cavity is qsol7.50 MW and the time rate ofchange of energy stored in the salt is .For a cavity opening of diameter Ds1 m, determinethe heat transfer to the Rankine cycle, qR. The temper-ature of the salt is maintained at its melting point,Tsalt?Tm?1000C. Neglect heat loss by convectionand irradiation from the surroundings.

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