Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 25 Oct 2017 My Price 6.00

Thermal energy storage systems

Thermal energy storage systems commonly involve a packed bed of solid spheres, through which a hot gas flows if the system is being charged, or a cold gas if it is being discharged. In a charging process, heat transfer from the hot gas increases thermal energy stored within the colder spheres: during discharge, the stored energy decreases as heat is transferred from the warmer spheres to the cooler gas.




Consider a packed bed of 75-mm-diameter aluminum spheres (p = 2700 kg/m3 · c = 950 J/kg · K, k = 240 W/m · K) and a charging process for which gas enters the storage unit at a temperature of Tg,i = 300°C. If the initial temperature of the spheres is Tj = 25°C and the convection coefficient is h = 75 W/m2 · K, how long does it take a sphere near the inlet of the system to accumulate 90% of the maximum possible thermal energy? What is the corresponding temperature at the center of the sphere? Is there any advantage to using copper instead of aluminum?

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Maurice Tutor
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Status NEW Posted 25 Oct 2017 09:10 AM My Price 6.00

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