Improving the water transpiration in a solar steam generation device

2019 ◽  
Vol 20 (1) ◽  
pp. 59-64
Author(s):  
Yuan Meng ◽  
Haibo Li
Keyword(s):  
Thermal Evaporation ◽  
Sea Water ◽  
Bulk Water ◽  
Solar Irradiation ◽  
Steam Generation ◽  
Device Structure ◽  
Water Transportation ◽  
Speed Up ◽  
Solar Steam Generation ◽  
Water Transpiration

Abstract Solar steam generation (SSG) has been proposed as one of the most advanced techniques to trigger solar energy desalination of sea water. Although many efforts have been dedicated to develop SSG devices, the efficiency remains relatively low. Previous work was mainly focused on thermal insulation film and light absorption. Attention has seldom been concentrated on device structure. Inspired by the manner of water transportation within flowers, we designed an artificial SSG unit which can effectively speed up the water transpiration from the bulk to the surface. Another advantage of such a device is that steam generation is separated from the bulk salty solution and thereby the solar thermal evaporation can be improved greatly. As demonstrated via the desalination experiment, the mass change and evaporation rate under 1 solar irradiation can reach as high as 2.51 kg/m2 and 1.26 kg/m2·h−1, respectively. Meanwhile, the evaporation efficiency is 74%. These values are much higher than those of traditional SSG devices and bulk water.

Hydrophobic W18O49 mesocrystal on hydrophilic PTFE membrane as an efficient solar steam generation device under one sun

2018 ◽  
Vol 6 (23) ◽  
pp. 10939-10946 ◽  
Author(s):  
Yuhong Chang ◽  
Zhenguang Wang ◽  
Yu-e Shi ◽  
Xicheng Ma ◽  
Long Ma ◽  
...  
Keyword(s):  
Steam Generation ◽  
Ptfe Membrane ◽  
Water Transportation ◽  
Solar Steam Generation

W18O49@PDMS mesocrystal membrane with the hydrophobic top and the hydrophilic bottom possesses the properties of self-floating and water transportation simultaneously.

Reversing heat conduction loss: Extracting energy from bulk water to enhance solar steam generation

Nano Energy ◽  
2020 ◽  
Vol 78 ◽  
pp. 105269 ◽  
Author(s):  
Yida Wang ◽  
Xuan Wu ◽  
Xiaofei Yang ◽  
Gary Owens ◽  
Haolan Xu
Keyword(s):  
Heat Conduction ◽  
Bulk Water ◽  
Steam Generation ◽  
Conduction Loss ◽  
Solar Steam Generation

scholarly journals A photothermal reservoir for highly efficient solar steam generation without bulk water

2019 ◽  
Vol 64 (21) ◽  
pp. 1625-1633 ◽  
Author(s):  
Xuan Wu ◽  
Ting Gao ◽  
Chenhui Han ◽  
Jingsan Xu ◽  
Gary Owens ◽  
...  
Keyword(s):  
Bulk Water ◽  
Steam Generation ◽  
Highly Efficient ◽  
Solar Steam Generation

scholarly journals Self-assembly of highly efficient, broadband plasmonic absorbers for solar steam generation

2016 ◽  
Vol 2 (4) ◽  
pp. e1501227 ◽  
Author(s):  
Lin Zhou ◽  
Yingling Tan ◽  
Dengxin Ji ◽  
Bin Zhu ◽  
Pei Zhang ◽  
...  
Keyword(s):  
Light Absorption ◽  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Large Scale ◽  
Strong Field ◽  
Local Heating ◽  
Field Enhancement ◽  
Solar Irradiation ◽  
Steam Generation ◽  
Solar Steam Generation

The study of ideal absorbers, which can efficiently absorb light over a broad range of wavelengths, is of fundamental importance, as well as critical for many applications from solar steam generation and thermophotovoltaics to light/thermal detectors. As a result of recent advances in plasmonics, plasmonic absorbers have attracted a lot of attention. However, the performance and scalability of these absorbers, predominantly fabricated by the top-down approach, need to be further improved to enable widespread applications. We report a plasmonic absorber which can enable an average measured absorbance of ~99% across the wavelengths from 400 nm to 10 μm, the most efficient and broadband plasmonic absorber reported to date. The absorber is fabricated through self-assembly of metallic nanoparticles onto a nanoporous template by a one-step deposition process. Because of its efficient light absorption, strong field enhancement, and porous structures, which together enable not only efficient solar absorption but also significant local heating and continuous stream flow, plasmonic absorber–based solar steam generation has over 90% efficiency under solar irradiation of only 4-sun intensity (4 kW m−2). The pronounced light absorption effect coupled with the high-throughput self-assembly process could lead toward large-scale manufacturing of other nanophotonic structures and devices.

Highly Anisotropic Corncob as an Efficient Solar Steam-Generation Device with Heat Localization and Rapid Water Transportation

2020 ◽  
Vol 12 (45) ◽  
pp. 50397-50405
Author(s):  
Tingjie Chen ◽  
Hao Xie ◽  
Xin Qiao ◽  
Shuqiang Hao ◽  
Zhenzeng Wu ◽  
...  
Keyword(s):  
Steam Generation ◽  
Water Transportation ◽  
Solar Steam Generation

scholarly journals Dispersed solar still for effective desalination using montmorillonite nanoparticles for sturdy clean water yield

2021 ◽  
Author(s):  
V. Baskaran ◽  
R. Saravanane
Keyword(s):  
Sea Water ◽  
Low Cost ◽  
Water Yield ◽  
Clean Water ◽  
Steam Generation ◽  
Clay Nanoparticles ◽  
Water Characteristics ◽  
Current Water ◽  
Floating Type ◽  
Solar Steam Generation

Abstract Direct Solar Steam Generation (DSSG) system is an emerging technique in the field of desalination for yielding sustainable clean water. This investigation propagates through the use of nanoscale absorbers (montmorillonite) for sturdy desalination because of their excellent photo thermal conversation of nanoparticles. The solar absorber was dispersed in sea water in liquid type rather than fixed or floating type. Nanoparticles of chemical composition were employed by the researchers from starting to the present day, which includes carbon nanotubes, graphene oxide, etc. Inspired by nature and keeping in mind an eco-friendly technique, here we considered montmorillonite clay nanoparticles of natural origin. The experiment was conducted for an operational period of 14 days with a yield of 5.33–6.45 kg/m2/day with an evaporation rate of 0.70, 1.42 and 4.47 kg/m2.hr under 1-, 2- and 4-sun irradiance. The clean water output parameters was validated with WHO standards to satisfy potable water characteristics. The water characteristics before desalination for turbidity, pH, and Cl–, Na+ and TDS were found to be 48.50, 8.7, and 18,400, 12,120, 20,400 mg/L respectively; after desalination they were found to be 0.30, 6.65, 12, 4.5 and 52 mg/L respectively. This work focuses on current water scarcity problem and suggest a way to survival by using naturally available, low cost material.

scholarly journals Graphene oxide-based efficient and scalable solar desalination under one sun with a confined 2D water path

2016 ◽  
Vol 113 (49) ◽  
pp. 13953-13958 ◽  
Author(s):  
Xiuqiang Li ◽  
Weichao Xu ◽  
Mingyao Tang ◽  
Lin Zhou ◽  
Bin Zhu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Thermal Insulation ◽  
High Efficiency ◽  
Water Solution ◽  
Bulk Water ◽  
Water Quantity ◽  
Steam Generation ◽  
Water Path ◽  
Solar Desalination ◽  
Solar Steam Generation

Because it is able to produce desalinated water directly using solar energy with minimum carbon footprint, solar steam generation and desalination is considered one of the most important technologies to address the increasingly pressing global water scarcity. Despite tremendous progress in the past few years, efficient solar steam generation and desalination can only be achieved for rather limited water quantity with the assistance of concentrators and thermal insulation, not feasible for large-scale applications. The fundamental paradox is that the conventional design of direct absorber−bulk water contact ensures efficient energy transfer and water supply but also has intrinsic thermal loss through bulk water. Here, enabled by a confined 2D water path, we report an efficient (80% under one-sun illumination) and effective (four orders salinity decrement) solar desalination device. More strikingly, because of minimized heat loss, high efficiency of solar desalination is independent of the water quantity and can be maintained without thermal insulation of the container. A foldable graphene oxide film, fabricated by a scalable process, serves as efficient solar absorbers (>94%), vapor channels, and thermal insulators. With unique structure designs fabricated by scalable processes and high and stable efficiency achieved under normal solar illumination independent of water quantity without any supporting systems, our device represents a concrete step for solar desalination to emerge as a complementary portable and personalized clean water solution.

scholarly journals Design of intelligent and efficient water and electricity cogeneration equipment

2020 ◽  
Vol 165 ◽  
pp. 01002
Author(s):  
Haomin Zhang ◽  
Yuzhe Wu
Keyword(s):  
Temperature Difference ◽  
Lower Layer ◽  
Three Dimensional ◽  
Lower Surface ◽  
Bulk Water ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Steam Generation ◽  
Nano Fluid ◽  
Solar Steam Generation

The solar steam generation system studied in this project is mainly composed of a double-layered structure. The upper layer is a nano-fluid material with a light absorber, and the lower layer is an insulating material with two-dimensional or three-dimensional water transport channels. It is hydrophilic to utilize capillary forces and promote Fluid flows to the hot zone, and interconnected pores are used for fluid inflow and outflow to the structure. The device embeds a semiconductor temperature difference power generation sheet in the lower layer, the upper surface is in contact with the photothermal layer, and the lower surface is in contact with the bulk water. The formation of a temperature difference generates an electromotive force, which makes the energy utilization efficiency higher.

scholarly journals Evaporation above a bulk water surface using an oil lamp inspired highly efficient solar-steam generation strategy

2018 ◽  
Vol 6 (26) ◽  
pp. 12267-12274 ◽  
Author(s):  
Xuan Wu ◽  
Limin Wu ◽  
Jeanette Tan ◽  
George Y. Chen ◽  
Gary Owens ◽  
...  
Keyword(s):  
Water Surface ◽  
Bulk Water ◽  
Steam Generation ◽  
Evaporation Surface ◽  
Highly Efficient ◽  
Solar Steam Generation ◽  
Oil Lamp

Inspired by a kerosene oil lamp, a highly efficient solar-evaporation system with the evaporation surface located above the bulk water surface is realized.

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