Desalination using solar energy and waste heat: Towards sustainability

Veera Gnaneswar Gude, N. Nirmal Khandan, Shuguang Deng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper describes the theoretical rationale for a new low-temperature phase-change desalination process, and six examples of applications to illustrate how this process can be engineered for sustainable desalination. In this process, brackish water is evaporated at near-ambient temperatures under near-vacuum pressures created by the barometric head without any mechanical energy input. Thermodynamic advantages and benefits of low temperature phase-change desalination are discussed and results from simulation studies and a prototype test system are presented. Three of the examples illustrate how the proposed process can be driven by solar energy: a) utilizing direct solar energy; b) inclusion of an external reflector; c) utilizing photovoltaic energy during non- sunlight hours. The other examples illustrate how the proposed process can be driven by waste heat: i) waste heat rejected by an absorption refrigeration unit driven by grid power; ii) waste heat rejected by an absorption refrigeration unit driven by solar collectors; and iii) waste heat rejected by an absorption refrigeration unit supported by a photovoltaic array. Merits of utilizing solar energy and process waste heat in reducing energy consumption and green house gas emissions are discussed in detail.

Original languageEnglish (US)
Title of host publication40th ASES National Solar Conference 2011, SOLAR 2011
Pages370-375
Number of pages6
StatePublished - 2011
Event40th ASES National Solar Conference 2011, SOLAR 2011 - Raleigh, NC, United States
Duration: May 17 2011May 20 2011

Publication series

Name40th ASES National Solar Conference 2011, SOLAR 2011
Volume1

Other

Other40th ASES National Solar Conference 2011, SOLAR 2011
CountryUnited States
CityRaleigh, NC
Period5/17/115/20/11

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Gude, V. G., Nirmal Khandan, N., & Deng, S. (2011). Desalination using solar energy and waste heat: Towards sustainability. In 40th ASES National Solar Conference 2011, SOLAR 2011 (pp. 370-375). (40th ASES National Solar Conference 2011, SOLAR 2011; Vol. 1).