Modelling and experimental verification of a solar-powered liquid desiccant cooling system for greenhouse food production in hot climates


Experiments and theoretical modelling have been carried out to predict the performance of a solar-powered liquid desiccant cooling system for greenhouses. We have tested two components of the system in the laboratory using MgCl2 desiccant: (i) a regenerator which was tested under a solar simulator and (ii) a desiccator which was installed in a test duct. Theoretical models have been developed for both regenerator and desiccator and gave good agreement with the experiments. The verified computer model is used to predict the performance of the whole system during the hot summer months in Mumbai, Chittagong, Muscat, Messina and Havana. Taking examples of temperate, sub-tropical, tropical and heat-tolerant tropical crops (lettuce, soya bean, tomato and cucumber respectively) we estimate the extensions in growing seasons enabled by the system. Compared to conventional evaporative cooling, the desiccant system lowers average daily maximum temperatures in the hot season by 5.5-7.5 °C, sufficient to maintain viable growing conditions for lettuce throughout the year. In the case of tomato, cucumber and soya bean the system enables optimal cultivation through most summer months. It is concluded that the concept is technically viable and deserves testing by means of a pilot installation at an appropriate location.

Publication DOI:
Divisions: Engineering & Applied Sciences > Engineering Systems & Management
Engineering & Applied Sciences > Mechanical Engineering & Design
Engineering & Applied Sciences > Sustainable environment research group
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Lychnos, G & Davies, PA, 'Modelling and experimental verification of a solar-powered liquid desiccant cooling system for greenhouse food production in hot climates' Energy, vol. 40, no. 1 (2012) DOI
Uncontrolled Keywords: liquid desiccant cooling,food security,climate change,greenhouse,solar energy
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2012-04
Authors: Lychnos, George
Davies, Philip A. ( 0000-0003-4783-1234)



Version: Accepted Version

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