Abstract
Dew condensers collect dew via thermal radiation and cooling affect without the use of external energy. The aim of this project was to design the 1m x 1m with 30° angle square funnel dew, fog and rainwater collector to calculate the dew yield in Abu Dhabi urban area. In addition, studies were conducted to determine whether the collected dew quantity is significant for practical use and to verify the cooling effect in condenser surface using temperature sensors. Aluminum was chosen as dew collector material due to its high emissivity. Square funnel was chosen as condenser shape due to easiness of the assembly and feasibility of its design. The quantity of the collected water depended on the weather condition. The average collected water was 0.016 ml/day (0.016 mm/m2 /day). Temperature sensor analysis showed that there was a 3.5 °C temperature difference between condenser top and bottom indicating the cooling effect of square funnel shape.
Highlights
The increases in industrialization and population put heavy pressure on water supplies in our planet
Dew has been proposed as an alternative water resource in arid to subtropical regions
According to the available radiative energy for condensation, the maximum dew water yield is about 0.3–0.6 L/day/m2 of surface area in arid and semi-arid climates [8,9,10]
Summary
The increases in industrialization and population put heavy pressure on water supplies in our planet. Radiation ( the loss of heat to the sky) leads to cooling and this process is the main contributor to the formation of dew droplets [1] Moreever, meteorological conditions such as ambient air temperature, relative humidity, wind speed, cloud cover, and sky radiation play significant roles in condensation process. According to the available radiative energy for condensation, the maximum dew water yield is about 0.3–0.6 L/day/m2 of surface area in arid and semi-arid climates [8,9,10]. Dew collector in humid tropical island in French Polynesia collected 0.23 L/day/m2 water [13]. A dew harvesting system collected 0.28 L /m2/day of dew compared to 0.17 L/ m2/day of rainfall in Morocco [5] In this project, we designed 1m2 planar dew, fog and rainwater collector to calculate the dew water yield and to determine the cooling effect in dew collector using temperature sensors. The quantity and frequency of collected dew water were measured to determine if the quantity is significant for practical use
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