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Organic Rankine Cycle recovering stage heat from MSF desalination distillate water

Lookup NU author(s): Dr Sandy Anderson, Dr Guohong Tian

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Abstract

This investigation addresses the potential for heat recovery from Multi Stage Flash (MSF) desalination plant hot distillate water to power an Organic Rankine Cycle (ORC), comparing R134a and R245fa refrigerants as the working fluid. Using design characteristics of an existing ORC unit, the model was first validated against its measured output. The distillate hot water from MSF stages is utilised to provide heat to the ORC and performance is investigated for both working fluids and for the number of MSF stages for heat recovery. For the specific MSF plant investigated, the net produced ORC power is found the highest with extraction up to MSF powering stage 8, generating 359 kW when R245fa is used and 307 kW when R134a is used. Both refrigerants exhibit an increase of power output and decrease of energy efficiency as heat is recovered from more MSF stages. The influence of variation of the evaporator and cooling temperature on ORC performance is demonstrated to be significant for both refrigerants, with R245fa performing better in this specific application. (C) 2014 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Al-Weshahi MA, Anderson A, Tian GH

Publication type: Article

Publication status: Published

Journal: Applied Energy

Year: 2014

Volume: 130

Pages: 738-747

Print publication date: 01/10/2014

Online publication date: 14/03/2014

Acceptance date: 18/02/2014

ISSN (print): 0306-2619

ISSN (electronic): 1872-9118

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.apenergy.2014.02.038

DOI: 10.1016/j.apenergy.2014.02.038

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