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Publication Title | Desalination and Water Treatment

Organic Rankine Cycle

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Desalination and Water Treatment

www.deswater.com

1944-3994 / 1944-3986 © 2009 Desalination Publications. All rights reserved. doi: 10.5004/dwt.2009.115

1 (2009) 114–127 January

Simulation of an autonomous, two-stage solar organic Rankine cycle system for reverse osmosis desalination

G. Kosmadakis*, D. Manolakos, S. Kyritsis, G. Papadakis

Department of Natural Resources and Agricultural Engineering, Agricultural University of Athens, 75 Iera Odos Street, 11855 Athens, Greece

Tel. +30 210 529 4033, Fax: +30 210 529 4023; email: gkosmad@central.ntua.gr

Received 10 July 2007; Accepted 14 August 2008

abstract

The present work concerns the simulation of an autonomous, two-stage solar organic Rankine cycle (SORC) for RO desalination. Aiming at improving the e ciency of the single-stage low temperature (operation temperature range in the order of 70–80°C) SORC for RO desalination, a high temperature (operation temperature range in the order of 140°C) stage is added. The basic principle of operation is that the heat extracted from the condensation of the high temperature stage (e.g. upper stage), evaporates the refrigerant of the low temperature stage (e.g. lower stage), thus signi cantly increasing the overall e ciency. In comparison with the low temperature single-stage system, the two-stage system exploits much more e ciently the heat produced by the vacuum tube solar collector array, since a higher operational temperature di erence between high and low temperature reservoirs is achieved. Moreover, an analysis of the desalination unit takes place so that to estimate the annual desalinated water. The system design was implemented based on TRNSYS V16.0 and ROSA so ware.

Keywords: Evacuated solar collectors; Solar organic Rankine cycle; RO desalination

* Corresponding author.

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