(a) A storage heater contains 1 m3 of water at 70 °C. Given that it delivers heat to a room maintained at 20 °C, what is

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A A Storage Heater Contains 1 M3 Of Water At 70 C Given That It Delivers Heat To A Room Maintained At 20 C What Is 1 (54.89 KiB) Viewed 9 times

(a) A storage heater contains 1 m3 of water at 70 °C. Given that it delivers heat to a room maintained at 20 °C, what is its heat storage capacity in kWh m?? Assume: density of water in the relevant temperature range is 1000 kg mº, and the heat capacity of water in the relevant temperature range is 4.2 JK'g? (b) A heat storage system developed on part of the lime cycle, based on the exothermic reaction of lime (Cao) with water to produce slaked lime (Ca(OH)2), and the corresponding endothermic dissociation of slaked lime to re-form lime is developed. In this system, the volatile product is steam, which is condensed and stored. Assuming that the slaked lime powder is 40% of its bulk density, and that the heat evolved by condensing steam is wasted, calculate the heat storage capacity in kWh per cubic metre of Ca(OH)2. DATA: Ca(OH)2(s) CaO(s) + H2O(g) AH,0 = 109 kJ/mol H2O(1) H2O(g) AH," = 44 kJ/mol Bulk density of Ca(OH)2 = 2240 kg/m3