A panel heating terminal with photovoltaic direct drive electric heating phase change heat storage wall panel heating terminal is proposed, which uses photovoltaic DC to drive the electric heating film to produce heat and store the heat in the phase change material at the same time. The heat transfer model is established by using the multi physical field coupling software COMSOL, and the effect of adding flat fins （fin spacing, length and thickness） on the heat transfer process of phase change heat storage wall panel under natural convection conditions is discussed. The results show that properly reducing the fin spacing can effectively shorten the complete melting time of PCM, improve the average heat storage rate, and extend the heat release time, but the effect is not obvious. When the fin spacing is less than 25 mm, the total heat storage decreases significantly; Under the same fin spacing, the greater the proportion of fin length to the radial length of PCM, the higher the heat storage rate; When the thickness is 1 mm, the average heat storage rate reaches the maximum of 103.3 kJ/h, which increases by 27.2% compared with the structure without fins.

direct-drive photovoltaic electric-heating system  /  phase change materials  /  natural convection  /  heat transfer enhancement  /  fins