A Computational Solution of Melting Process inside a Sphere Towards the Latent Heat Storage in a Solar Air Heater
DOI:
https://doi.org/10.37934/cfdl.17.7.6173Keywords:
Enthalpy method, spherical coordinate, melting fraction, paraffin waxes, energy storageAbstract
Latent heat storage using the phase change material (PCM) in a solar air collector is a measure to extend the collector's operating time during off sunshine period because air cannot store heat. In this paper, the melting prediction of spherical PCM under hot air convection is established by a one-dimensional unsteady enthalpy equation and solved by the finite difference method. The numerical results are compared with published data to confirm the accuracy. The independent parameters to investigate the charging include sphere diameter, air temperature, air velocity and initial temperature of PCM. The effects of air temperature and sphere diameter are significant on the melting rate of PCM. When the diameter increases by 2.5 times, the time to complete liquefaction increases by 5 times. At an air temperature of 70C, the required liquefaction time is 75 mins for a 40 mm diameter sphere.
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