In this article, a theoretical simulation of a modified tubular solar still (TSS) integrated with a rectangular basin painted black color was investigated. The simulation was conducted out using a 2-dimensional computational fluid dynamics by COMSOL metaphysics software. The two different types of phase change materials- PCMs have been used as a heat storage medium; paraffin wax and stearic acid. Influence of several parameters PCM mass, solar radiation, wind speed and temperature environment (ambient temperature) was studied. Therefore, a set of numerical simulations were displayed out to study the effect of heat transfer within the TSS. A series of this analysis in various real weather conditions (Najaf, latitude = 32° 1′ 38.55″ N, longitude = 44° 19′ 59.22″ E) on the TSS with seven PCM layers having a different thickness (tPCM = 5, 10, 20, 30, 40, 50 and 60 mm) were performed. The simulation results indicate that within the daytime, a more applicably performance of TSS was achieved with 40 mm PCM (2.664 kg of paraffin wax or 3.143 kg of stearic acid) compared to TSS without PCM. They are shown that the proposed solar system with PCM is significantly better due to thermal loss reduction. In general, the system including paraffin wax is most effective with or without stearic acid. The results of the analytical simulation were validated with experimental field results. It was found a good agreement between the numerical data obtained, and the experimental data have been obtained (rMBE = 0.022).

在本文中，研究了将改进的管状太阳能蒸馏器（TSS）与涂有黑色颜料的矩形盆集成在一起的理论模拟。通过COMSOL形而上学软件使用二维计算流体动力学进行了模拟。两种不同类型的相变材料-PCM已用作储热介质。石蜡和硬脂酸。研究了几个参数对PCM质量，太阳辐射，风速和温度环境（环境温度）的影响。因此，展示了一组数值模拟来研究TSS内的热传递效应。在TSS上使用七个厚度不同的PCM层（tPCM = 5，10）在各种实际天气条件（Najaf，纬度= 32°1'38.55“ N，经度= 44°19'59.22” E）上进行的一系列分析，20、30，40、50和60 mm）仿真结果表明，与没有PCM的TSS相比，在白天，使用40 mm PCM（2.664 kg的石蜡或3.143 kg的硬脂酸）可获得更适用的TSS性能。他们表明，由于热损失的减少，建议的带有PCM的太阳能系统明显更好。通常，含或不含硬脂酸的含石蜡的体系最有效。分析模拟的结果已通过实验现场结果进行了验证。发现所获得的数值数据与已获得的实验数据之间具有良好的一致性（rMBE = 0.022）。143千克硬脂酸）与无PCM的TSS相比。他们表明，由于热损失的减少，建议的带有PCM的太阳能系统明显更好。通常，含或不含硬脂酸的含石蜡的体系最有效。分析模拟的结果已通过实验现场结果进行了验证。发现所获得的数值数据与已获得的实验数据之间具有良好的一致性（rMBE = 0.022）。143千克硬脂酸）与无PCM的TSS相比。他们表明，由于热损失的减少，建议的带有PCM的太阳能系统明显更好。通常，含或不含硬脂酸的含石蜡的体系最有效。分析模拟的结果已通过实验现场结果进行了验证。发现所获得的数值数据与已获得的实验数据之间具有良好的一致性（rMBE = 0.022）。