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Temperature Effects and Entropy Generation of Pressure Retarded Osmosis Process

School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada
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Entropy 2019, 21(12), 1158; https://doi.org/10.3390/e21121158
Received: 19 October 2019 / Revised: 11 November 2019 / Accepted: 22 November 2019 / Published: 27 November 2019
(This article belongs to the Special Issue Entropy and Thermodynamics in Desalination Systems)
Pressure retarded osmosis (PRO) is considered as one of the promising and new techniques to generate power. In this work, a numerical model was used to study the effect of the flow streams temperature on the performance of the PRO process and entropy generation. The variation of the feed solution and draw solution temperatures, pressure difference, concentration difference, and flow rates on the power density and entropy generation were discussed. The model results were validated with experimental measurements obtained from literature and showed a good agreement with the model predictions. It was found that the power density increases by about 130% when both feed solution and draw solution temperatures increase from 20 °C to 50 °C. The feed solution temperature has more impact on the power density than that of the draw solution. This is due to the direct effect of the feed solution temperature on the water permeability and diffusion coefficient. The effect of the feed solution temperature becomes significant at higher concentration differences. Whereas, at low concentrations, the power density slightly increases with the feed temperature. Furthermore, it is found that there is an optimum volumetric flow in the channels that maximizes the power density and minimizes the entropy generation when fixing other operating conditions. View Full-Text
Keywords: pressure retarded osmosis; temperature effect; power density; entropy generation; optimum flow pressure retarded osmosis; temperature effect; power density; entropy generation; optimum flow
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Abdelkader, B.; Sharqawy, M.H. Temperature Effects and Entropy Generation of Pressure Retarded Osmosis Process. Entropy 2019, 21, 1158.

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