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Forecasting solar still performance from conventional weather data variation by machine learning method

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Chinese Physics B 2023年第4期32卷 19-25页

作者：高文杰沈乐山孙森山彭桂龙申震王云鹏 AbdAllah Wagih Kandeal 骆周扬 A.E.Kabeel 张坚群鲍华杨诺 State Key Laboratory of Coal Combustion and School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China Zhejiang Baima Lake Laboratory Co. Ltd.Hangzhou 31121China Zhejiang Energy Group R&D Institute Co.Ltd.Hangzhou 311121China Zhejiang Zheneng Yueqing Electric Power Generation Co. Ltd.Yueqing 325609China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China Mechanical Engineering Department Faculty of EngineeringKafrelsheikh UniversityKafrelsheikh 33516Egypt Mechanical Power Engineering Department Faculty of EngineeringTanta UniversityTantaEgypt Faculty of Engineering Delta University for Science and TechnologyGamasaEgypt

solar stills are considered an effective method to solve the scarcity of drinkable ***,it is still missing a way to forecast its ***,it is proposed that a convenient forecasting model which just needs to input the conventional weather forecasting *** model is established by using machine learning methods of random forest and optimized by Bayesian *** required data to train the model are obtained from daily measurements lasting9 *** validate the accuracy model,the determination coefficients of two types of solar stills are calculated as 0.935and 0.929,respectively,which are much higher than the value of both multiple linear regression(0.767)and the traditional models(0.829 and 0.847).Moreover,by applying the model,we predicted the freshwater production of four cities in *** predicted production is approved to be reliable by a high value of correlation(0.868)between the predicted production and the solar *** the help of the forecasting model,it would greatly promote the global application of solar stills.

关键词： solar still production forecasting forecasting model weather data random forest

Performance analysis of solar still with cow dung cakes and blue metal stones

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Frontiers in Energy 2015年第2期9卷 180-186页

作者： Hitesh N. PANCHAL Mechanical Engineering Department Gujarat Power Engineering andResearch Institute Mevad 382710 India

The aims of this paper is to investigate the effects of various materials inside the solar still on the increase of the productivity of potable water. Here, blue metal stones and cow dung cakes were used as materials. To investigate their effect, three identical solar stills with an effective area of 1 m square made from locally available materials were tested in climate conditions of Mehsana （23°50＇ N 72° 23＇）. The first and second solar stills were filled with blue metal, stones and cow dung cakes, while the third one was taken as a reference which consisted of only blue paint at the basin. The experiments show that blue metal stones have the highest distillate output at daytime, followed by cow dung cakes solar still and reference solar still. On the other hand, the overall distillate output of blue metal stones and cow dung cakes at daytime as well as at night were 35% and 20% compared with that of reference solar still.

关键词： blue metal stones cow dung cakes distillateoutput solar still solar intensity

Study of Different Parameters Affecting the Productivity of solar still for Seawater Desalination under Djiboutian Climate

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Energy and Power Engineering 2022年第6期14卷 201-216页

作者： Elmi Idil Mouhoumed Mohamed-Awal Abdillahi Mohamed Abdourachid Ibrahim Igueh Centre de Recherche en énergie et Environnement Université de Djibouti Djibouti République de Djibouti

Experimental studies were carried out to determine the influence of solar radiation, temperatures variations, basin water amount, wind speed, glass cover thickness and salinity on the daily production of the distillate output using solar desalination process, namely single slope solar still to produce fresh water from seawater in the context of Djibouti. The temperatures variations increase in relation to solar radiation. Consequently the hourly distillate output increases and reaches a maximum around noon when the solar still receives maximum intensity of solar radiation. An inverse relation is found between glass cover thickness, basin water amount and distillate output production. The variation wind speed has an effect on the daily production;which increases in relation to wind speed. In order to assess the effect of salinity on the daily production, the solar still is provided with brackish water to compare the daily production obtained from seawater. Experimental results show that the cumulative productivity decreases when there is an increase of salinity. In addition, the quality of the distillate output was tested by measuring TDS, EC, pH, hardness water and chlorides and was compared to WHO standards. The values obtained for these parameters were in accordance with the requirements of WHO and good removal efficiency for four parameters.

关键词： solar still Glass Cover Thickness Salinity solar Radiation Djibouti

Thermodynamics of a Shallow solar still

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Energy and Power Engineering 2014年第9期6卷 246-265页

作者： Juan Cristobal Torchia-Núnez Jaime Cervantes-de-Gortari Miguel Angel Porta-Gándara Independent Energy Consultant San JoseCosta Rica Mechanical Engineering Department National University of MexicoMexico CityMexico CIBNOR La PazBCSMexico

A detailed summary of the most relevant aspects of the thermodynamics of a shallow solar still is presented, including historical features not often found in the literature. solar distillation has grown from applying empirical knowledge to advanced modeling and simulation. Geometrical, environmental and operational parameters of the solar still to heat transfer phenomena including evaporation and condensation, are taken into account in this overview, giving a comprehensive structure and classification to the study of solar stills from the thermodynamic point of view. The article describes global parameters, such as solar radiation, wind speed and thermal insulation among others and how they have been taken into account in the literature. Also, a distinction between internal and external heat transfer phenomena is proposed for clarification. Exergy balance is included to account for thermodynamic imperfections in the several processes inside the solar still.

关键词： solar still Overview Thermodynamics Modeling Exergy Heat Transfer

Heat and Mass Transfer and Thermo Physical Analysis of Water Distillation Using Passive solar still

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Smart Grid and Renewable Energy 2020年第6期11卷 73-87页

作者： M. Koilraj Gnanadason P. Senthil Kumar Vincent H. Wilson Principal Jayaraj Annapackiam CSI Polytechnic College Nazareth Tamil Nadu India Principal K.S.R. College of Engineering Tiruchengode Tamil Nadu India Professor in Technology Management Vellore Institute of Technology Vellore Tamil Nadu India

The demand of fresh water is becoming an increasingly important issue across the world. To alleviate this problem, a single slope single basin solar still was designed and tested. Top glass cover 9° slope ensures a very good transmission of solar radiation inside the still. In this paper a review of factors that improve the performance of the still is presented. Energy balances are made for each element of the still;solar time, direction of beam of radiation, clear sky radiation, optical properties of the cover, convection outside the still, convection and evaporation inside are accounted. Theoretical analysis of the heat and mass transfer mechanisms inside the solar still has been developed to find out heat transfer coefficients such as internal and external heat transfer modes and thermo physical properties such as dynamic viscosity, density, thermal conductivity, latent heat of evaporation and saturated vapor pressure for passive solar distillation system. Heat transfer coefficients were estimated for the present system since the still efficiency depends on heat transfer modes. It is also suggested that the water temperature plays a vital role in the distillate output since it increases significantly with the rise of basin water temperature. It is also found that the rise in water temperature increases the evaporative heat transfer coefficient value significantly.

关键词： solar still Ambient Convection Evaporation still Performance solar Energy