Modeling and testing of a dew collection system

Gandhidasan, P.; Abualhamayel, H. I.

doi:10.1016/j.desal.2004.11.085

Cited by 48 publications

(25 citation statements)

References 4 publications

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“…Gandhidasan and Abualhamayel [9] report a dew harvest rate of 0.22 mm/night from January to February in Dhahran, Saudi Arabia, with an agreement of 14.3% between the theoretical and experimental results. On the other hand, Maestre-Valero et al [18] report 17.4 mm/night and 20.8 mm/night of dew harvest for one year, using white standard foil and black foil, with a Root Mean Square Error (RMSE), of 0.051 mm, and 0.053 mm, respectively.…”

Section: Introductionmentioning

confidence: 63%

Winter Dew Harvest in Mexico City

Ernesto

Jasson

2015

Atmosphere

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This study presents experimental and theoretical results of winter dew harvest in México City in terms of condensation rate. A simplified theoretical model based on a steady-state energy balance on a radiator-condenser was fitted, as a function of the ambient temperature, the relative humidity and the wind velocity. A glass sheet and aluminum sheet white-painted were used as samples over the outdoor experiments. A good correlation was obtained between the theoretical and experimental data. The experimental results show that there was condensation in 68% of the winter nights on both condensers. The total winter condensed mass was 2977 g/m 2 and 2888 g/m 2 on the glass sheet and aluminum sheet white-painted, respectively. Thus, the condensed mass on the glass was only 3% higher than that on the painted surface. The maximum nightly dew harvests occurred during December, which linearly reduced from 50 g/m 2 night to 22 g/m 2 night as the winter months went by. The condensation occurred from 1:00 a.m. to 9:00 a.m., with maximum condensation rates between 6:00 a.m. and 7:00 a.m. The dew harvest can provide a partial alternative to the winter water shortage in certain locations with similar climates to the winter in Mexico City, as long as pollution is not significant.

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Section: Introductionmentioning

confidence: 63%

Winter Dew Harvest in Mexico City

Ernesto

Jasson

2015

Atmosphere

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“…More recently, systematic investigations of high yield radiative materials with hydrophilic properties for drop recovery, and adapting the condensing architecture, were carried out with respect to local meteorological parameters such as wind speed, wind direction, relative humidity, etc. (Gindel, 1965;Nilsson, 1996;Kounouhewa and Awanou, 1999;Muselli et al, 2002Muselli et al, , 2006aSharan and Prakash, 2003;Beysens et al, 2003Beysens et al, , 2005Beysens et al, , 2006bBerkowicz et al, 2004;Jacobs et al, 2004;Gandhidasan and Abualhamayel, 2005). For a plane condensing structure the ''best'' tilt angle for passive dew drop recovery was found to be 301 from horizontal (Beysens et al, 2003).…”

Section: Introductionmentioning

confidence: 89%

A study of dew water yields on Galvanized iron roofs in Kothara (North-West India)

Sharan

Beysens

Milimouk-Melnytchouk

2007

Journal of Arid Environments

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“…Dew formation is governed not only by meteorological conditions such as air temperature and humidity, wind speed, and longwave radiation transfer (Gandhidasan and Abualhamayel 2005) but also by the substrate physical properties (Beysens 1995). In spite of complex processes of dew formation, a simple energy balance equation (Madeira et al 2002) is used in VUCM to estimate dew quantity and duration on the roof, road, vegetation, and soil ground surface.…”

Section: Water Budget On the Surfacesmentioning

confidence: 99%

A Vegetated Urban Canopy Model for Meteorological and Environmental Modelling

Lee

Park

2007

Boundary-Layer Meteorol

149

158

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An urban canopy model is developed for use in mesoscale meteorological and environmental modelling. The urban geometry is composed of simple homogeneous buildings characterized by the canyon aspect ratio (h/w) as well as the canyon vegetation characterized by the leaf aspect ratio (σ l ) and leaf area density profile. Five energy exchanging surfaces (roof, wall, road, leaf, soil) are considered in the model, and energy conservation relations are applied to each component. In addition, the temperature and specific humidity of canopy air are predicted without the assumption of thermal equilibrium. For radiative transfer within the canyon, multiple reflections for shortwave radiation and one reflection for longwave radiation are considered, while the shadowing and absorption of radiation due to the canyon vegetation are computed by using the transmissivity and the leaf area density profile function. The model is evaluated using field measurements in Vancouver, British Columbia and Marseille, France. Results show that the model quite well simulates the observations of surface temperatures, canopy air temperature and specific humidity, momentum flux, net radiation, and energy partitioning into turbulent fluxes and storage heat flux. Sensitivity tests show that the canyon vegetation has a large influence not only on surface temperatures but also on the partitioning of sensible and latent heat fluxes. In addition, the surface energy balance can be affected by soil moisture content and leaf area index as well as the fraction of vegetation. These results suggest that a proper parameterization of the canyon vegetation is prerequisite for urban modelling.

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Modeling and testing of a dew collection system

Cited by 48 publications

References 4 publications

Winter Dew Harvest in Mexico City

Winter Dew Harvest in Mexico City

A study of dew water yields on Galvanized iron roofs in Kothara (North-West India)

A Vegetated Urban Canopy Model for Meteorological and Environmental Modelling

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