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Estimation of dew yield from radiative condensers by means of an energy balance model

Maestre-Valero, J.F.; Ragab, R.; Martínez-Alvarez, V.; Baille, A.. 2012 Estimation of dew yield from radiative condensers by means of an energy balance model. Journal of Hydrology, 460-61. 103-109. 10.1016/j.jhydrol.2012.06.046

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Abstract/Summary

This paper presents an energy balance modelling approach to predict the nightly water yield and the surface temperature (Tf) of two passive radiative dew condensers (RDCs) tilted 30º from horizontal. One was fitted with a white hydrophilic polyethylene foil recommended for dew harvest and the other with a black polyethylene foil widely used in horticulture. The model was validated in south-eastern Spain by comparing the simulation outputs with field measurements of Tf and dew yield. The results indicate that the model is robust and accurate in reproducing the behaviour of the two RDCs, especially in what refers to Tf, whose estimates were very close to the observations. The results were somewhat less precise for dew yield, with a larger scatter around the 1:1 relationship. A sensitivity analysis showed that the simulated dew yield was highly sensitive to changes in relative humidity and downward longwave radiation. The proposed approach provides a useful tool to water managers for quantifying the amount of dew that could be harvested as a valuable water resource in arid, semiarid and water stressed regions.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.jhydrol.2012.06.046
Programmes: CEH Topics & Objectives 2009 - 2012 > Water
CEH Sections: Acreman
ISSN: 0022-1694
Additional Information. Not used in RCUK Gateway to Research.: This paper was part of work carried out by the first author as part of his PhD study while visiting CEH. He has obtained his PhD from the Universidad Politécnica de Cartagena, Escuela Técnica Superior de Ingeniería Agronómica,Cartagena, 30203, Spain.
Additional Keywords: water harvesting, dew collection, surface temperature, dew modelling, south-eastern Spain
NORA Subject Terms: Meteorology and Climatology
Hydrology
Atmospheric Sciences
Date made live: 17 Jul 2012 10:54
URI: http://nora.nerc.ac.uk/id/eprint/18759

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