Architecting a Janus biomass carbon/sponge evaporator with salt-rejection and easy-floatation for sustainable solar-driven desalination

2021 ◽  
Author(s):  
Keyuan Xu ◽  
Cheng-Bing Wang ◽  
Zhengtong Li ◽  
Xinyue Yan ◽  
Xueyang Mu ◽  
...  
Keyword(s):  
Production Rate ◽  
Biomass Carbon ◽  
Water Production ◽  
Seawater Desalination ◽  
Steam Generation ◽  
Salt Deposition ◽  
Absorber Structure ◽  
Water Production Rate ◽  
Solar Steam Generation ◽  
Generation Technology

Solar steam generation technology is considered to be one of the most promising seawater desalination. To achieve a high and stable water production rate, absorber structure and salt deposition are...

scholarly journals Seawater Desalination Based on a Bubbling and Vacuum-Enhanced Direct Contact Membrane Distillation

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Guangfu Cao ◽  
Qingfen Ma ◽  
Jingru Li ◽  
Shenghui Wang ◽  
Chengpeng Wang ◽  
...  
Keyword(s):  
Production Rate ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Published Data ◽  
Water Production ◽  
Permeate Flux ◽  
Seawater Desalination ◽  
Noncondensable Gas ◽  
Direct Contact Membrane Distillation ◽  
Water Production Rate

A Bubbling and Vacuum-enhanced direct contact membrane distillation (BVDCMD) is proposed to improve the water production rate of the direct contact membrane distillation (DCMD-)based seawater desalination process. Its heat and mass transfer mechanism are theoretically analyzed, and a CFD model is established, which is verified by the published data. Four types of the noncondensable gas, “O2,” “air,” “N2,” and “H2,” are adopted as the bubbling gas, and their process enhancements under different pressure of permeate side, temperature, and NaCl concentration of feed side and flow velocities are investigated. The results show that the permeate flux increased remarkably with the decrease in the viscosity of the bubbling gas, and hence, “H2” is the best option for the bubbling gas, with the permeate flux being enhanced by 144.11% and the effective heat consumption being increased by 20.81% on average. The effective water production rate of BVDCMD is predicted to be 42.38% more than that of DCMD, proving its feasibility in the seawater desalination.

Highly‐Efficient Solar Steam Generation with Real Time Salinity Monitoring for Seawater Desalination

2021 ◽  
pp. 2100430
Author(s):  
Meiyu Xiong ◽  
Suwei Dong ◽  
Yunfan Xu ◽  
Cihui Liu ◽  
Yunsong Di ◽  
...  
Keyword(s):  
Real Time ◽  
Seawater Desalination ◽  
Steam Generation ◽  
Highly Efficient ◽  
Solar Steam Generation

scholarly journals Narrow-band photometry of Long Period Comets with TRAPPIST telescopes in 2019-2020

2020 ◽  
Author(s):  
Youssef Moulane ◽  
Emmanuel Jehin ◽  
Francisco José Pozuelos ◽  
Jean Manfroid ◽  
Zouhair Benkhaldoun ◽  
...  
Keyword(s):  
Solar System ◽  
Production Rate ◽  
Heliocentric Distance ◽  
Narrow Band ◽  
Maximum Activity ◽  
The Sun ◽  
Water Production ◽  
Dust Production ◽  
Long Period ◽  
Water Production Rate

<p>Long Period Comets (LPCs) have orbital periods longer than 200 years, perturbed from their resting place in the Oort cloud. Such gravitational influences may send these icy bodies on a path towards the center of the Solar system in highly elliptical orbits. In this work, we present the activity and composition evolution of several LPCs observed with both TRAPPIST telescopes (TS and TN) during the period of 2019-2020. These comets include: C/2017 T2 (PANSTARRS), C/2018 Y1 (Iwamoto), C/2018 W2 (Africano), and disintegrated comet C/2019 Y4 (ATLAS). We monitored the OH, NH, CN, C<sub>2</sub> and C<sub>3</sub> production rates evolution and their chemical mixing ratios with respect to their distances to the Sun as well as the dust production rate proxy (A(0)fp) during the journey of these comets into the inner Solar system.</p> <p><strong>C/2017 T2 (PANSTARRS)</strong> is a very bright comet which was discovered on October 2, 2017 when it was 9.20 au from the Sun. We started observing this comet with TS at the beginning of August 2019 when it was at 3.70 au. The comet made the closest approach to the Earth on December 28, 2019 at a distance of 1.52 au and it passed the perihelion on May 4, 2020 at 1.61 au. The water production rate of the comet reached a maximum of (4,27±0,12)10<sup>28 </sup>molecules/s and its dust production rate (A(0)fp(RC)) also reached the peak of 5110±25 cm on January 26, 2020, when the comet was at 2.08 au from the Sun (-100 days pre-perihelion). At the time of writing, we still monitoring the activity of the comet with TN at heliocentric distance of 1.70 au. Our observations show that C/2017 T2 is a normal LPC.</p> <p><strong>C/2018 Y1 (Iwamoto)</strong> is a nearly parabolic comet with a retrograde orbit discovered on December 18, 2018 by Japanese amateur astronomer Masayuki Iwamoto. We monitored the activity and composition of Iwamoto with both TN and TS telescopes from January to March 2019. The comet reached its maximum activity on January 29, 2019 when it was at 1.29 au from the Sun (-8 days pre-perihelion) with Q(H<sub>2</sub>O)=(1,68±0,05)10<sup>28 </sup>molecules/s and A(0)fp(RC)= 92±5 cm. These measurements show that it was a dust-poor comet compared to the typical LPCs.</p> <p><strong>C/2018 W2 (Africano) </strong>was discovered on November 27, 2018 at Mount Lemmon Survey with a visual magnitude of 20. The comet reached its perihelion on September 6, 2019 when it was at 1.45 au from the Sun. We monitored the comet from July 2019 (r<sub>h</sub>=1.71 au) to January 2020 (r<sub>h</sub>=2.18 au) with both TN and TS telescopes. The comet reached its maximum activity on September 21, 15 days post-perihelion (r<sub>h</sub>=1.47 au) with Q(H<sub>2</sub>O)=(0,40±0,03)10<sup>28 </sup>molecules/s.</p> <p><strong>C/2019 Y4 (ATLAS)</strong> is a comet with a nearly parabolic orbit discovered on December 18, 2019 by the ATLAS survey. We started to follow its activity and composition with broad- and narrow-band filters with the TN telescope on February 22, 2019 when it was at 1.32 au from the Sun until May 3, 2020 when the comet was at a heliocentric distance of 0.90 au inbound. The comet activity reached a maximum on March 22 (r<sub>h</sub>=1.65 au) 70 days before perihelion. At that time, the water-production rate reached (1,53±0,04)10<sup>28 </sup>molecules/s and the A(0)fp reached (1096±14) cm in the red filter. After that, the comet began to fade and disintegrated into several fragments.</p>

scholarly journals Self-floating hybrid hydrogels assembled with conducting polymer hollow spheres and silica aerogel microparticles for solar steam generation

2019 ◽  
Vol 7 (3) ◽  
pp. 1244-1251 ◽  
Author(s):  
Mengyao Tan ◽  
Jin Wang ◽  
Wenhui Song ◽  
Jianhui Fang ◽  
Xuetong Zhang
Keyword(s):  
Polyvinyl Alcohol ◽  
Production Rate ◽  
Conducting Polymer ◽  
Silica Aerogel ◽  
Hollow Spheres ◽  
Steam Generation ◽  
Hybrid Hydrogels ◽  
Solar Steam Generation

Self-floating polyvinyl alcohol (PVA) based hybrid hydrogels for efficient solar steam generation with a highest production rate of 1.83 kg m−2 h−1 under 1 sun illumination are designed and synthesized by assembling conducting polymer hollow spheres and aerogel microparticles within the network.

A solar-electro-thermal evaporation system with high water-production based on a facile integrated evaporator

2020 ◽  
Vol 8 (41) ◽  
pp. 21771-21779
Author(s):  
Jiaxiang Ma ◽  
Yu Han ◽  
Ying Xu ◽  
Tao Zhang ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Production Rate ◽  
Thermal Evaporation ◽  
High Water ◽  
Water Evaporation ◽  
Preparation Process ◽  
Water Production ◽  
Simple Preparation ◽  
Water Production Rate

An integrated photo-electro-thermal evaporation system uses a simple preparation process successfully achieves the improvement of water production rate in the day and continuous water evaporation at night.

Water production rate of Comet C/2009 P1 (Garradd) throughout the 2011–2012 apparition: Evidence for an icy grain halo

Icarus ◽  
2013 ◽  
Vol 225 (1) ◽  
pp. 740-748 ◽  
Author(s):  
M.R. Combi ◽  
J.T.T. Mäkinen ◽  
J.-L. Bertaux ◽  
E. Quémerais ◽  
S. Ferron ◽  
...  
Keyword(s):  
Production Rate ◽  
Water Production ◽  
Water Production Rate

Direct solar steam generation system for clean water production

2019 ◽  
Vol 18 ◽  
pp. 429-446 ◽  
Author(s):  
Panpan Zhang ◽  
Qihua Liao ◽  
Houze Yao ◽  
Yaxin Huang ◽  
Huhu Cheng ◽  
...  
Keyword(s):  
Clean Water ◽  
Water Production ◽  
Steam Generation ◽  
Generation System ◽  
Solar Steam Generation
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