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We need 75,500 πJ, changing it to Kilowatt-hour: The conversion factor is 1 kilowatt-hour is 3600 kilojoule, or 1 kilojoule is 0.00027777778 kilowatt-hour 75,500ππ Γ 1 = 20.98kWh Or 21kWh 3600 Sand as thermal energy storage material One of the most abundant materials on the surface of the earth. Most common kind of sand is silica sand (SiO2). In Jordan, Silica sand has a very low level of impurities and very easy to access mainly in the south of the country. For this project Silica sand is used as the storage material, it is considered as a sensible heat type of thermal energy storage. It has a thermal conductivity of 0.33 W/m Β°C, and an average thermal heat capacity of 0.8 kJ/kgΒ°C [12]. Silica sand also can heat up to 800Β°C β 1000Β°C which makes it a very attractive substitute for molten salts in CSP applications like concentrated solar tower [13]. Sand Storage For the amount of sand needed, we just need to translate the amount of energy required, to the amount of sand needed to carry and store that amount of energy. Taking into consideration that the specific heat for sand is 0.83 kJ/kg Β°C. [2] π = π Γ πΆπ Γ βπ π=π πΆπ Γ βπ βπ=π‘πππππβπ‘ππππ‘πππ =80β5=75Β°C π = 75,500 ππ 0.830 ππ Γ 75Β°C ππΒ°C π = 75,500 ππ 62.25 9PDF Image | Sand Energy Storage System for Water Heater
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