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Strategic assessment and mapping of opportunities for water desalination and water use optimisation of concentrated solar power generation in South Africa
Expanded Title:Renewable energy projects, including CSP, are being increasingly developed in South Africa while the country attempts to minimise its reliance on fossil fuel-based power production. Concentrated Solar Power plants use a thermal power generation process which requires a steam cycle; the steam is required to be condensed, and this requires cooling. Wet-cooling, dry-cooling, or hybridcooling technologies may be used. While wet-cooling is the most efficient technology, it requires large amounts of water. Concentrated Solar Power offers potential for combined power generation and desalination. Areas that have a high Direct Normal Irradiance (DNI) usually have limited or no water resources and therefore wet-cooled CSP plants may compete for scarce water resources unless alternatives of CSP, including optimally sited dry cooling, CSP saline water cooling and CSP desalination, are investigated. Concentrated Solar Power plants using air cooling reduce water consumption by 90% but when the ambient temperatures exceed 30-35°C, the plant efficiency is reduced and less electricity is produced. Sites need to be chosen that have a suitable combination of cost of energy and cost of water to maximise the energy cost efficiency of CSP plants while still minimising water consumption.
Date Published:01/05/2016
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Planning and development, Drinking water - Water supply
Document Keywords:Water Quality
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2382/1/16
ISBN No:978-1-4312-0787-9
Authors:Govender M; Leyde S; Fischer T; Weston M
Project No:K5/2382
Organizations:EScience Associates (PTY) LTD.
Document Size:29 422 KB
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