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research-article

The force analysis of a solar all-glass spiral vacuum thermal-collecting tube which is suitable for seawater desalination

[+] Author and Article Information
Rao Kuang

Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology, School of Energy and Environment, Southeast University, 2# Si Pai Lou, Nanjing, Jiangsu Province, PRC
roykennan@163.com

Yankun Song

Southeast University, 2# Si Pai Lou, Nanjing, Jiangsu Province, PRC
yankun.l.song@gmail.com

Zijie Li

Southeast University, 2# Si Pai Lou, Nanjing, Jiangsu Province, PRC
1278048582@qq.com

Qiuzi Gu

Southeast University, 2# Si Pai Lou, Nanjing, Jiangsu Province, PRC
742063534@qq.com

1Corresponding author.

ASME doi:10.1115/1.4039330 History: Received July 01, 2017; Revised January 17, 2018

Abstract

Solar desalination is an important way to obtain fresh water. Nowadays, the all-glass vacuum tube with only one open end (blind pipe) is widely used in hot-water system, and the glass-metal vacuum tube is commonly used in solar trough concentrating system in medium temperature area. But both of them have drawbacks for seawater desalination. The former cannot quickly heat seawater to 100?, the latter is expensive and fails to make full use of its high temperature advantage. A new design of a medium-temperature full-glass evacuated tube whose inner tube is wound by a spiral structure is proposed in to achieve a more cost-effective solar trough concentrating system for solar desalination. The sealing stress between inner and outer tube is analyzed and the thermal performance is tested in this paper. The results showed that the vacuum tube could withstand temperature of 250?, quickly heat seawater and has good corrosion resistance and can keep a long-term vacuum. Such a tube enables seawater to flow directly without oil heat-exchange system, so it is a more promising solution for seawater desalination.

Copyright (c) 2018 by ASME
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