A comparative numerical study of three similar passive solar stills: Single slope, V-type, and greenhouse

Q2 Mathematics CFD Letters Pub Date : 2023-11-29 DOI:10.37934/cfdl.16.1.6878
Nguyen Van Dung, Nguyen Minh Phu, Nguyen Minh, Phu
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Abstract

In this paper, three solar stills with similar geometries are numerically investigated for analysis and comparison. The solar stills include single slope, V-type, and greenhouse stills. Steady-state laminar flow numerical simulations with different water surface temperatures and cover glass temperatures are performed. Simulation results were confirmed with data from analytical and experimental models to ensure reliability. The results showed that the V-type still has a higher number of recirculation zones than that of single slope and greenhouse stills. These vortex regions are small, but the velocity magnitude is no less than the other two stills. This difference makes the freshwater yield and convection heat transfer coefficient of V-type still the largest. Daily freshwater productions of single slope, V-type, and greenhouse stills are 0.592, 0.673, and 0.623 kg/m2, respectively. Productivity at 15 PM is 2.5 times higher than the hours from noon to 14 PM. The natural convection heat transfer coefficient seemed to be unvaried with the temperature difference but changed strongly with the still geometry.
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对三种类似被动式太阳能蒸馏器的数值比较研究:单坡、V 型和温室
本文对具有相似几何形状的三种太阳能蒸馏器进行了数值研究,以进行分析和比较。这些太阳能蒸馏器包括单坡、V 型和温室蒸馏器。在不同的水面温度和盖板玻璃温度下进行了稳态层流数值模拟。模拟结果与分析和实验模型的数据进行了确认,以确保可靠性。结果表明,与单坡蒸馏器和温室蒸馏器相比,V 型蒸馏器有更多的再循环区。这些漩涡区很小,但速度大小不亚于其他两种蒸馏器。这一差异使得 V 型蒸馏器的淡水产量和对流换热系数最大。单坡、V 型和温室蒸馏器的日淡水产量分别为 0.592、0.673 和 0.623 公斤/平方米。下午 15 时的生产率是中午至下午 14 时的 2.5 倍。自然对流传热系数似乎与温差无关,但与蒸馏器的几何形状有很大关系。
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来源期刊
CFD Letters
CFD Letters Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
3.40
自引率
0.00%
发文量
76
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