Open AccessJournal Article
Exergy Analysis of a Solar Humidification- Dehumidification Desalination Unit
TLDR
In this article, the exergy analysis of a desalination unit using humidification-dehumidification process is presented, where the authors consider a thermal system with three main components: the heating unit by using a solar collector, the evaporator or the humidifier, and the condenser or the dehumidifier.Abstract:
This paper presents the exergy analysis of a desalination unit using humidification-dehumidification process. Here, this unit is considered as a thermal system with three main components, which are the heating unit by using a solar collector, the evaporator or the humidifier, and the condenser or the dehumidifier. In these components the exergy is a measure of the quality or grade of energy and it can be destroyed in them. According to the second law of thermodynamics this destroyed part is due to irreversibilities which must be determined to obtain the exergetic efficiency of the system. In the current paper a computer program has been developed using visual basic to determine the exergy destruction and the exergetic efficiencies of the components of the desalination unit at variable operation conditions such as feed water temperature, outlet air temperature, air to feed water mass ratio and salinity, in addition to cooling water mass flow rate and inlet temperature, as well as quantity of solar irradiance. The results obtained indicate that the exergy efficiency of the humidifier increases by increasing the mass ratio and decreasing the outlet air temperature. In the other hand the exergy efficiency of the condenser increases with the increase of this ratio and also with the increase of the outlet air temperature. Keywords—Exergy analysis, desalination, solar, humidifier, condenser.read more
Citations
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Journal ArticleDOI
A novel configuration of reverse osmosis, humidification–dehumidification and flat plate collector: Modeling and exergy analysis
TL;DR: In this article, a novel configuration containing reverse osmosis (RO), humidification-dehumidification (HDH), and flat plate collector (FPC) by considering the variations of chemical exergy, feed water mass flow rate, salinity and applied pressure have been presented.
Journal ArticleDOI
Energy and exergy analysis of a novel humidification-dehumidification desalination system with fogging technique
TL;DR: In this paper, the authors provided and examined a new humidification-dehumidification (HDH) water desalination system equipped with the fogging nozzles technique that is experimentally proofed, when compared to other HDH systems, to impacting the performance positively in terms of reducing the exergy destruction of the Desalination process.
References
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Book
Advanced Engineering Thermodynamics
TL;DR: The First Law of Thermodynamics and the Second Law of Exergy were combined in this paper to describe the destruction of exergy in single-phase and multi-phase systems.
Thermodynamics and sustainable development; the use of exergy analysis and the reduction of irreversibility
TL;DR: In this article, the authors demonstrate exergy analysis as a powerful instrument to obtain sustainable development by minimising the irreversibilities caused by the use of non-renewables.
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