Low-cost high-efficiency solar steam generator by combining thin film evaporation and heat localization: Both experimental and theoretical study

Peng, Guilong; Ding, Hongru; Sharshir, Swellam W.; Li, Xiaojia; Liu, Hanchen; Ma, Dengke; Wu, Lirong; Zang, Jianfeng; Liu, Huan; Yu, Wei; Xie, Huaqing; Yang, Nuo

doi:10.1016/j.applthermaleng.2018.08.004

Cited by 90 publications

(26 citation statements)

References 52 publications

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“…[7][8][9] Recently, more and more attention has been paid to the bi-layer system, which could limit the heat to the evaporating surface and therefore minimize the heat dissipating from the heating surface to the bulk water. [10][11][12] In such a bi-layer system, the top layer should consist of a material with a wide wavelength absorption and high lightheat-conversion efficiency, and the bottom layer is usually a porous hydrophilic material for pumping water and also thermal insulation. Many materials have been tested as a potential first-layer material, such as carbonbased materials, [13][14][15][16][17][18] semiconductor films, 19,20 and noble metal nanoparticles.…”

Section: Discussionmentioning

confidence: 99%

“…Traditional solar steam‐generating methods often use volumetric absorbers like nanoparticles to directly heat bulk water, thus resulting in huge optical and systematic heat losses . Recently, more and more attention has been paid to the bi‐layer system, which could limit the heat to the evaporating surface and therefore minimize the heat dissipating from the heating surface to the bulk water . In such a bi‐layer system, the top layer should consist of a material with a wide wavelength absorption and high light‐heat‐conversion efficiency, and the bottom layer is usually a porous hydrophilic material for pumping water and also thermal insulation.…”

Section: Introductionmentioning

confidence: 99%

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Solar vapor generation optimization of a carbon‐black/wood‐flour system with strength enhanced by polystyrene

Huang

Liu

et al. 2020

Int J Energy Res

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Summary A solar vapor generation system with a high evaporation efficiency and also a high mechanical strength is still attractive, while most previous works only focused on efficiency. Herein, we firstly prepared a carbon‐black/wood‐flour system with strength enhanced by polystyrene. Then, we investigated the effects of porosity, polystyrene content, and thermal insulation on the evaporation performance of the system. Experimental results indicate that the porosity of system can significantly affect the evaporation efficiency. With the increase of porosity, there exists an optimal porosity to obtain a high evaporation efficiency. A higher content of polystyrene, which could cause a lower thermal conductivity of the system, always gives a higher evaporation efficiency when the porosity is fixed. For polystyrene content of 60 wt% and system porosity of 36%, under a 1‐sun irradiation, there is an optimal evaporation efficiency of about 80.4%. Additionally, the fracture stresses of the system in dry and wet states could be as high as 2.18 and 2.03 MPa, respectively, which ensures the system strength. Considering the high efficiency, high mechanical strength, low cost, and easy preparation, this system has a good potential to be used in practical applications.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solar vapor generation optimization of a carbon‐black/wood‐flour system with strength enhanced by polystyrene

Huang

Liu

et al. 2020

Int J Energy Res

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“…A thin liquid layer with evaporation plays a significant role in various physical fundamental problems and industrial utilization including thin-film coating [21,22], organic electronics [23,24] and heat-energy engineering [25,26]. In terms of the industrial application technology of crystal preparation, it is crucial to study the flow stability in shallow liquid layers, see the review article by Imaishi and Kakimoto [27].…”

Section: Introductionmentioning

confidence: 99%

Thermocapillary flow transition in an evaporating liquid layer in a heated cylindrical cell

Liu¹,

Chen²,

Ouazzani³

et al. 2020

International Journal of Heat and Mass Transfer

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Motived by recent ground-based and microgravity experiments investigating the interfacial dynamics of a volatile liquid (FC-72, P r = 12.34) contained in a heated cylindrical cell, we numerically study the thermocapillarydriven flow in such an evaporating liquid layer. Particular attention is given to the prediction of the transition of the axisymmetric flow to fully threedimensional patterns when the applied temperature increases. The numerical simulations rely on an improved one-sided model of evaporation by including heat and mass transfer through the gas phase via the heat transfer Biot number and the evaporative Biot number. We present the axisymmetric flow characteristics, show the variation of the transition points with these Biot numbers, and more importantly elucidate the twofold role of the latent heat of evaporation in the stability; evaporation not only destabilizes the flow but also stabilizes it, depending upon the place where the evaporationinduced thermal gradients come into play. We also show that buoyancy in the liquid layer has a stabilizing effect, though its effect is insignificant. At high Marangoni numbers, the numerical simulations revealed smaller-scale thermal patterns formed on the surface of a thinner evaporating layer, in qualitative agreement with experimental observations. The present work helps to gain a better understanding of the role of a phase change in the

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“…For maximum productivity this must be close to the latitude angle of the site . Several factors were found to enhance the productivity, such as the increase in evaporation rate using wick materials . The use of graphite and copper oxide as nanoparticles ameliorated the productivity by 57.6 and 47.8% respectively, while the glass cover of the still is cooled by film cooling , an increase of 50.3% more than the conventional solar still when flake graphite nanoparticles were used , Ding uses a nano ratchet, multilayer graphene with cone‐shaped nanopores (MGCN), which creates a difference in pressure which accelerates the vapor generation, an increase of at least 15 times .…”

Section: Introductionmentioning

confidence: 99%

Improving the water production of a solar still by adding an internal condensation chamber: A theoretical study

Mahammed

Kerfah

Bezzina

2019

Env Prog and Sustain Energy

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In this article, the validity of a numerical simulation of a basin solar still coupled with a condensation chamber was analyzed, before being cooled through a cooling water system. The system contained a serpentine pipe combined with a rectangular sheet of galvanized steel. The model was validated by comparing calculated and then experimental results mentioned in previous research for a typical day in the month of June 2013, the comparison of results showed a good agreement between the experimental and numerical tests. The model was developed to evaluate the performance of the system with optimum mass flow and compared throughout the typical day of each month of the year with that of a solar still without cooling. The model was investigated numerically according to meteorological data of the Algerian city, Khemis Miliana using the model of Capderou. The equations are modeled by the finite difference method, the Gauss–Seidel iterative method was used to solve the resulting algebraic equation. The highest productivity of the year was 6.7 Kg/m2 during the typical day of august with 60% higher productivity than the still without cooling. It was observed that the productivity of the solar still was sensitive to the flow mass of cooling water. Both the condenser chamber volume and the area from the opening of the evaporator to the condenser chamber have a significant effect on distillate production of the system. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Low-cost high-efficiency solar steam generator by combining thin film evaporation and heat localization: Both experimental and theoretical study

Cited by 90 publications

References 52 publications

Solar vapor generation optimization of a carbon‐black/wood‐flour system with strength enhanced by polystyrene

Solar vapor generation optimization of a carbon‐black/wood‐flour system with strength enhanced by polystyrene

Thermocapillary flow transition in an evaporating liquid layer in a heated cylindrical cell

Improving the water production of a solar still by adding an internal condensation chamber: A theoretical study

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