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Performance analysis of solar cogeneration system with different integration strategies for potable water and domestic hot water production
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. American University of Ras Al Khaimah (AURAK), United Arab Emirates.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Australian National University, Australia.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-3661-7016
2016 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 170, p. 466-475Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

A novel solar thermal cogeneration system featuring the provision of potable water with membrane distillation in combination with domestic hot water supply has been developed and experimentally analyzed. The system integrates evacuated tube collectors, thermal storage, membrane distillation unit, and heat exchangers with the overall goals of maximizing the two outputs while minimizing costs for the given design conditions. Experiments were conducted during one month's operation at AURAK's facility in UAE, with average peak global irradiation levels of 650 W/m2. System performance was determined for three integration strategies, all utilizing brackish water (typical conductivity of 20,000 μs/cm) as a feedstock: Thermal store integration (TSI), which resembles a conventional indirect solar domestic hot water system; Direct solar integration (DSI) connecting collectors directly to the membrane distillation unit without thermal storage, and Direct solar with thermal store integration (DSTSI), a combination of these two approaches. The DSTSI strategy offered the best performance given its operational flexibility. Here the maximum distillate productivity was 43 L/day for a total gross solar collector area of 96 m2. In terms of simultaneous hot water production, 277 kWh/day was achieved with this configuration. An economic analysis shows that the DSTSI strategy has a payback period of 3.9 years with net cumulative savings of $325,000 during the 20 year system lifetime.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 170, p. 466-475
Keywords [en]
Cogeneration, Evacuated tube collector, Membrane distillation, Solar energy, System integration, Thermal storage, Cogeneration plants, Distillation, Distillation equipment, Economic analysis, Heat storage, Hot water distribution systems, Investments, Water, Water supply, Evacuated tube collectors, Potable water
National Category
Energy Engineering Water Treatment
Identifiers
URN: urn:nbn:se:kth:diva-186962DOI: 10.1016/j.apenergy.2016.02.033ISI: 000374601400042Scopus ID: 2-s2.0-84961670467OAI: oai:DiVA.org:kth-186962DiVA, id: diva2:930573
Note

QC 20160524

Available from: 2016-05-24 Created: 2016-05-16 Last updated: 2018-08-06Bibliographically approved
In thesis
1. Integration of Membrane Distillation and Solar Thermal Systems for Coproduction of Purified Water and Heat
Open this publication in new window or tab >>Integration of Membrane Distillation and Solar Thermal Systems for Coproduction of Purified Water and Heat
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the Middle East and North Africa region fresh water resources are very scarce and theexisting sources are depleting rapidly. Desalination is the method to fulfill increasing waterdemand, and people depend mostly upon bottled water for drinking purposes. Bottledwater is resource and energy demanding, hence there is a need for supplying drinkablewater in a sustainable way. The main objective of this research is to develop solutions forproviding potable water to urban communities through integrating membrane distillationwater purification units with solar driven hot water installations. A single-cassette Air GapMembrane Distillation (AGMD) unit was tested on laboratory scale to investigate theinfluence of various operating parameters on the distillate production. Particular attentionwas given for identifying process conditions relevant to the design of solar energyintegrated systems. In parallel, a simplified empirical model using response surfacemethods was developed and validated against bench scale experimental results. Thedeveloped model for performance indicators was later employed in dynamic simulations ofa solar thermal integrated membrane distillation system. A pilot plant was designed andinstalled at RAK Research and Innovation Center in UAE. Experimental investigations wereconducted on this integrated system for co-production of pure water (around 15-25 l/day)along with hot water production equivalent to the needs of a family of five. A dynamicsimulation model was developed in TRNSYS to analyze optimum operating conditions ofthe system. Economic analysis showed an impressive payback period and savings for theintegrated system as compared with standalone counterparts. A second pilot facility using alarger multi-cassette AGMD module and absorption cooler was designed and installed.Performance of this solar co-production system for heat, cooling, and pure water is analyzedfor various integration modes.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 100
Series
TRITA-KRV ; 17-10
Keywords
Solar Membrane Distillation, polygeneration, TRNSYS, Integrated systems
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-232854 (URN)978-91-7729-581-5 (ISBN)
Public defence
2017-12-12, Kollegiesalen, Brinellvägen 8, KTH Royal Institute of Technology, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20180806

Available from: 2018-08-06 Created: 2018-08-05 Last updated: 2018-08-06Bibliographically approved

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