Using water-filling and air-releasing to design a natural vacuum solar desalination system

Manhui Wei; Jianhua Xiang; Honglie Ye; Hongfei Zheng; Keliang Wang; Junfeng Chen

doi:10.1016/j.solener.2021.04.009

Using water-filling and air-releasing to design a natural vacuum solar desalination system

Manhui Wei, Jianhua Xiang^*, Honglie Ye, Hongfei Zheng, Keliang Wang, Junfeng Chen

^*Corresponding author for this work

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Water-filling and air-releasing were used to design a natural vacuum solar desalination system. The system was tested in various weather conditions to determine the operational regularity and total performance evaluation indices at different flow rates and temperatures. Economic analysis was applied to calculate the cost of freshwater produced. Results showed that the system performed better under the constant flow rate input of 0.150 kg/s with a heat collection area of 18.0 m². The efficiency and recovery ratios could reach 87.821 and 3.858%, respectively and these were 1.568 and 1.631 times the values before heat recovery. Moreover, the average freshwater yield could reach up to 6.018 kg/h. When seawater was added at a constant temperature while considering utilisation of waste heat at night, efficiency could reach 84.256% when the heat collection area was 14.4 m² and this was 1.080 times that of 18.0 m². The recovery ratio could reach 4.133% when the area was 18.0 m² and this was 1.069 times that of 14.4 m². After calculation, the cost of freshwater was about 0.0113 $/kg and this had certain advantages over other systems.

Original language	English
Pages (from-to)	598-607
Number of pages	10
Journal	Solar Energy
Volume	220
DOIs	https://doi.org/10.1016/j.solener.2021.04.009
Publication status	Published - 15 May 2021

Keywords

Evaporation and condensation
Natural vacuum
Solar desalination
Waste heat utilisation at night
Water-filling and air-releasing

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.solener.2021.04.009

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title = "Using water-filling and air-releasing to design a natural vacuum solar desalination system",

abstract = "Water-filling and air-releasing were used to design a natural vacuum solar desalination system. The system was tested in various weather conditions to determine the operational regularity and total performance evaluation indices at different flow rates and temperatures. Economic analysis was applied to calculate the cost of freshwater produced. Results showed that the system performed better under the constant flow rate input of 0.150 kg/s with a heat collection area of 18.0 m2. The efficiency and recovery ratios could reach 87.821 and 3.858%, respectively and these were 1.568 and 1.631 times the values before heat recovery. Moreover, the average freshwater yield could reach up to 6.018 kg/h. When seawater was added at a constant temperature while considering utilisation of waste heat at night, efficiency could reach 84.256% when the heat collection area was 14.4 m2 and this was 1.080 times that of 18.0 m2. The recovery ratio could reach 4.133% when the area was 18.0 m2 and this was 1.069 times that of 14.4 m2. After calculation, the cost of freshwater was about 0.0113 $/kg and this had certain advantages over other systems.",

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author = "Manhui Wei and Jianhua Xiang and Honglie Ye and Hongfei Zheng and Keliang Wang and Junfeng Chen",

note = "Publisher Copyright: {\textcopyright} 2021 International Solar Energy Society",

year = "2021",

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AU - Wei, Manhui

AU - Xiang, Jianhua

AU - Ye, Honglie

AU - Zheng, Hongfei

AU - Wang, Keliang

AU - Chen, Junfeng

PY - 2021/5/15

Y1 - 2021/5/15

N2 - Water-filling and air-releasing were used to design a natural vacuum solar desalination system. The system was tested in various weather conditions to determine the operational regularity and total performance evaluation indices at different flow rates and temperatures. Economic analysis was applied to calculate the cost of freshwater produced. Results showed that the system performed better under the constant flow rate input of 0.150 kg/s with a heat collection area of 18.0 m2. The efficiency and recovery ratios could reach 87.821 and 3.858%, respectively and these were 1.568 and 1.631 times the values before heat recovery. Moreover, the average freshwater yield could reach up to 6.018 kg/h. When seawater was added at a constant temperature while considering utilisation of waste heat at night, efficiency could reach 84.256% when the heat collection area was 14.4 m2 and this was 1.080 times that of 18.0 m2. The recovery ratio could reach 4.133% when the area was 18.0 m2 and this was 1.069 times that of 14.4 m2. After calculation, the cost of freshwater was about 0.0113 $/kg and this had certain advantages over other systems.

AB - Water-filling and air-releasing were used to design a natural vacuum solar desalination system. The system was tested in various weather conditions to determine the operational regularity and total performance evaluation indices at different flow rates and temperatures. Economic analysis was applied to calculate the cost of freshwater produced. Results showed that the system performed better under the constant flow rate input of 0.150 kg/s with a heat collection area of 18.0 m2. The efficiency and recovery ratios could reach 87.821 and 3.858%, respectively and these were 1.568 and 1.631 times the values before heat recovery. Moreover, the average freshwater yield could reach up to 6.018 kg/h. When seawater was added at a constant temperature while considering utilisation of waste heat at night, efficiency could reach 84.256% when the heat collection area was 14.4 m2 and this was 1.080 times that of 18.0 m2. The recovery ratio could reach 4.133% when the area was 18.0 m2 and this was 1.069 times that of 14.4 m2. After calculation, the cost of freshwater was about 0.0113 $/kg and this had certain advantages over other systems.

KW - Evaporation and condensation

KW - Natural vacuum

KW - Solar desalination

KW - Waste heat utilisation at night

KW - Water-filling and air-releasing

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VL - 220

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JO - Solar Energy

JF - Solar Energy

ER -

Using water-filling and air-releasing to design a natural vacuum solar desalination system

Abstract

Keywords

UN SDGs

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