The influences of a layer of a Phase Change Material (PCM) and the Dufour effect on thermal performance of a Salt Gradient Solar Pond (SGSP) are investigated numerically. The enthalpy model is used to model the heat transfer in the PCM layer. The transfer equations in the SGSP are solved using the implicit Finite Volume Method, the Gauss method and the SIMPLE algorithm. The explicit Finite Volume Method is retained for the heat transfer equation of the PCM layer. The developed numerical model that has been validated experimentally and numerically is used to simulate the operation of the SGSP during ten days under the meteorological data of Tangier in Morocco. Two cases are considered for analysis; the first one is the SGSP without the PCM layer (case 1) and the second one is the SGSP with the PCM layer disposed at its bottom (case 2). The simulation results showed that the temperature, the thermal efficiency of the SGSP with the PCM layer are inferior and the amount of heat losses across the saline water free surface is superior to those of the SGSP without the PCM layer. Furthermore, the increase of the dimensionless Dufour coefficient from 0 to 0.8 leads to decrease, in case 1, the dimensionless temperature of the storage zone from 0.894 to 0.764 and the thermal storage efficiency from 37.41 % to 31.85 %. For the same range of variation of the dimensionless Dufour coefficient, the dimensionless temperature of the storage zone decreases from 0.800 to 0.688 and the thermal storage efficiency reduces from 33.32 % to 28.66 % in case 2. Thus, the Dufour effect is mitigated in the SGSP with the PCM compared to the SGSP without the PCM.

数值研究了相变材料（PCM）层和Dufour效应对盐梯度太阳能池（SGSP）的热性能的影响。焓模型用于对PCM层中的热传递进行建模。使用隐式有限体积法，高斯方法和SIMPLE算法求解SGSP中的传递方程。PCM层的传热方程式保留了显式有限体积法。根据摩洛哥丹吉尔的气象数据，已开发的数值模型已经过实验和数值验证，可用于模拟SGSP在十天内的运行。考虑两种情况进行分析；第一个是不带PCM层的SGSP（案例1），第二个是PCM层位于其底部的SGSP（案例2）。仿真结果表明，带有PCM层的SGSP的温度，热效率均较差，无盐水表面上的热损失量要高于没有PCM层的SGSP。此外，无量纲的Dufour系数从0增加到0.8导致在情况1中，存储区的无量纲温度从0.894到0.764减小，并且热存储效率从37.41％减小到31.85％。对于相同的无量纲Dufour系数变化范围，在第2种情况下，存储区的无量纲温度从0.800降低到0.688，热存储效率从33.32％降低到28.66％。因此，SGSP中的Dufour效应得以缓解。使用PCM与不使用PCM的SGSP相比。具有PCM层的SGSP的热效率较差，且无盐水表面上的热量损失要比没有PCM层的SGSP更好。此外，无量纲的Dufour系数从0增加到0.8导致在情况1中，存储区的无量纲温度从0.894到0.764减小，并且热存储效率从37.41％减小到31.85％。对于相同的无量纲Dufour系数变化范围，在第2种情况下，存储区的无量纲温度从0.800降低到0.688，热存储效率从33.32％降低到28.66％。因此，SGSP中的Dufour效应得以缓解。使用PCM与不使用PCM的SGSP相比。具有PCM层的SGSP的热效率较差，且无盐水表面上的热量损失要比没有PCM层的SGSP更好。此外，无量纲的Dufour系数从0增加到0.8导致在情况1中，存储区的无量纲温度从0.894到0.764减小，并且热存储效率从37.41％减小到31.85％。对于相同的无量纲Dufour系数变化范围，在第2种情况下，存储区的无量纲温度从0.800降低到0.688，热存储效率从33.32％降低到28.66％。因此，SGSP中的Dufour效应得以缓解。使用PCM与不使用PCM的SGSP相比。