Changing state
Passive solar energy storage material A Dow Chemical product called TESC-81 (primarily a salt, calcium chloride hexahydrate) is used as an energy-storage material for solar applications. Energy from the Sun raises the temperature of the solid material, causing it to melt at 27 °C (81 °F). At night the energy is released as the salt cools and returns to the solid state. (a) Determine the energy required to raise the temperature of 1.0 kg of solid TESC-81 from 20 °C to the liquid state at 27 °C. (b) How warm would 1.0 kg of water become if it started at 20 °C and absorbed the same energy? (c) Discuss the desirability of TESC-81 as a thermal energy-storage material compared to water. For TESC-81, c (solid) = 1900 J/kg . °C and L = 1.7 X 105 J/kg.
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