Desalination using low grade heat in the process industry: Challenges and perspectives

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  2. Dr Yasmine Ammar
  3. Dr Patricia Thornley
  4. Professor Tony Roskilly
Author(s)Ammar Y, Hanning Li, Walsh C, Thornley P, Sharifi V, Roskilly AP
Publication type Article
JournalApplied Thermal Engineering
Year2012
Volume48
Issue
Pages446-457
ISSN (print)1359-4311
ISSN (electronic)1873-5606
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This paper examines the use of lowgradeheat from process industries for thermal desalinationprocesses as this is relevant not only to current energy conservation schemes but also may play a role in increasing the capacity to satisfy future water demands. The study focuses on lowgradeheat sources from a paper mill located on a British coastal area which presents a large quantity of recoverable waste heat at low temperature (<100 °C). Two scenarios are considered: (i) lowgradeheat is used directly to feed the desalinationprocess, (ii) lowgradeheat is upgraded using a heat pump coupled with a desalination system.In the first scenario, a Humidification Dehumidification process was identified as a suitable technology due to its low operating temperature. In the second scenario, the lowgradeheat temperature was upgraded using a hybrid absorption heat pump and subsequently used to feed a Multiple Effect Distillation desalination system. These two cases were compared in terms of performances and economics. For both cases, a payback period of less than 10 years could be obtained for water price equal to £2 per tonnes of water. This is comparable to the price of home water supply. Environmental aspects were also discussed from the results of a full Lifecycle assessment. Lowgradeheat utilisation in both cases reduced the Global Warming Potential in comparison with fossil fuel powered systems, but toxicological impacts appeared higher in comparison to a system using natural gas.
PublisherPergamon
URLhttp://dx.doi.org/10.1016/j.applthermaleng.2012.05.012
DOI10.1016/j.applthermaleng.2012.05.012
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