On the second law analysis of a multi-stage spray-assisted low-temperature desalination system

被引:19
|
作者
Chen, Q. [1 ]
Ja, M. Kum [1 ]
Li, Y. [2 ]
Chua, K. J. [1 ]
机构
[1] Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore
[2] Shanghai Jiao Tong Univ, Inst Refrigerat & Cryogen, Shanghai 200240, Peoples R China
基金
新加坡国家研究基金会;
关键词
Entropy generation; Second law efficiency; Spray-assisted low-temperature; desalination; ENERGY COMBINED DESALINATION; ENTROPY GENERATION; HUMIDIFICATION-DEHUMIDIFICATION; THERMOPHYSICAL PROPERTIES; SEAWATER DESALINATION; PLANT; TECHNOLOGIES; PERFORMANCE; WATER; HEAT;
D O I
10.1016/j.enconman.2017.06.080
中图分类号
O414.1 [热力学];
学科分类号
摘要
High energy consumption is one of the major barriers that hinder the wide application of various desalination technologies. The energy intensity of the desalination process is further increased as a result of the irreversibilities within the system components. Second law analysis is an essential tool for highlighting the imperfections within the system. This paper specially conducts a second law analysis for a spray assisted low-temperature desalination technology. The entropy generation rates of each component are computed through a judiciously developed mathematical model. The rates of entropy generation under varying design and operating conditions are also investigated. Key results revealed that the heat exchangers are the dominating sources of entropy generation during almost all operating conditions. The specific entropy generation of the system could be minimized with lower top brine temperatures, higher operating stages, high completion level of evaporation/condensation processes and lower feed water salinities. In addition, a cooling water flowrate close to the feed flowrate resulted in the least amount of entropy generation. The specific entropy generation was computed to be 253 J/kg-K for a 10-stage system operating at a top brine temperature of 70 degrees C, with a corresponding second law efficiency of 3.47%. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1306 / 1316
页数:11
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