Study of melting properties of phase change materials at different inclination angles and heating boundaries
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Phase change thermal storage devices can effectively solve the shortcomings of solar energy such as intermittency anduncertainty, and realize the efficient use of renewable energy. However, the low thermal conductivity of phase changematerials makes it a research priority to increase the melting rate of heat storage units. In this paper, the melting performanceenhancement of the phase change thermal storage device is investigated. A numerical model is constructed for the phasechange process of the device at different inclination angles and heating boundaries, and parameters such as the completemelting time, the melting fraction, the phase interface and the temperature fields are discussed. The results show that thephase change heat storage rate is optimal at 90° inclination, which reduces the complete melting time by 14.05% comparedto 0° inclination. In addition, the increase of inclination angle not only increases the melting rate, but also reduces the areaof refractory region and improves the melting uniformity.
Abstract
Phase change thermal storage devices can effectively solve the shortcomings of solar energy such as intermittency anduncertainty, and realize the efficient use of renewable energy. However, the low thermal conductivity of phase changematerials makes it a research priority to increase the melting rate of heat storage units. In this paper, the melting performanceenhancement of the phase change thermal storage device is investigated. A numerical model is constructed for the phasechange process of the device at different inclination angles and heating boundaries, and parameters such as the completemelting time, the melting fraction, the phase interface and the temperature fields are discussed. The results show that thephase change heat storage rate is optimal at 90° inclination, which reduces the complete melting time by 14.05% comparedto 0° inclination. In addition, the increase of inclination angle not only increases the melting rate, but also reduces the areaof refractory region and improves the melting uniformity.