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Date of Publication:2015-01-01

Journal:西安交通大学学报

Affiliation of Author(s):海洋科学与技术学院

Issue:5

Page Number:30-35,67

ISSN No.:0253-987X

Abstract:A thermodynamic mathematical model of the low-temperature multiple effect distillation (LT-MED) desalination plant was developed to investigate the influence of the flow resistances on the heat transfer process. The distribution of various flow resistances was obtained. The effects of the number of evaporators/condensers and the average apparent heat transfer temperature difference (ΔTa) on the thermodynamic losses were analyzed. The results indicate that when ΔTa keeps constant, the flow resistances firstly descend and then rise as the sequence of evaporators/condensers increases. The corresponding temperature difference losses will keep growing. The proportions of the flow resistances across the demister and during the condensation process both get raised with the number of evaporators/condensers, and the flow resistance across the tube bundle goes down. The total temperature difference loss due to flow resistance increases with the number of evaporators/condensers and ΔTa. In addition, there is a considerable proportion of temperature difference loss due to the flow resistances, whose influence on the system performance should not be ignored. ©, 2015, Xi'an Jiaotong University. All right reserved.

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