Atmoswater Research Blog by Roland Wahlgren

Jalimudi Village (#India) #Water from Air Project

24/7/2013

Picture: Map showing location of Jalimudi, Andhra Pradesh, India

Location of Jalimudi, Andhra Pradesh, India. Image source: Google Earth.

According to WaterMaker India, the water-from-air project in Jalimudi has provided drinking water to 600 people for four years (since 2009) in an equatorial, winter dry climate region about 60 m above sea level. This is an important success story for water-from-air technology. The Jalimudi project provides a model for replication in other locations with water scarcity.

More information about the water-from-air resource in India may be found at:

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#Water from Air topics: Dew-point vs Temp vs Humidity in 3D

3/7/2013

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Picture: Dew-point shown as a 3D surface related to air temperature and relative humidity

Dew-point shown as a 3D surface related to air temperature and relative humidity. These values are for standard barometric pressure at sea level which is 1.01235 bar. Copyright 2013 by Atmoswater Research. All rights reserved. - Click on chart to enlarge -

Today's 3D dew-point graphic is related to yesterday's post showing how water vapour density (the water resource for atmospheric water generators or AWGs) varies with unlimited combinations of temperature and relative humidity.

Dew-point increases with increasing temperature and relative humidity. As mentioned in the water vapour density post, places on Earth where AWGs are likely to be operated have water vapour densities of 4 to 21 grams per cubic metre of moist air. This density range corresponds to dew-points of about -3°C to 24°C. Desiccant dehumidifiers can process air with negative dew-points so on the chart above, a sliver of the green zone, all of the purple and blue zones, and half the orange zone are relevant to all water-from-air technologies. Many AWGs use mechanical dehumidification for atmospheric water vapour processing. These machines are restricted to processing moist air having an above freezing dew-point. The only zones which apply to mechanical dehumidification are the purple, blue, and the first half of the orange surface.

The data for the chart is from the Dew-point Temperature Table (SI).

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See the #water vapour resource in 3D !

2/7/2013

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Picture: Water vapour density magnitude related to temperature and relative humidity

Water vapour density (the water-from-air resource) shown as a 3D surface related to air temperature and relative humidity. These values are for standard barometric pressure at sea level. (Copyright 2013 by Atmoswater Research. All rights reserved.) --Click on chart to enlarge--

Discussions about the operation of atmospheric water generators (AWGs) often focus on relative humidity ranges alone. This is a flawed way of thinking which becomes confusing. The correct approach is to discuss machine performance at specific combinations of temperature and relative humidity (at a specific air pressure). The chart shows how the water vapour density in the air varies according to the temperature - relative humidity combination at constant air pressure. Water vapour density is the water resource available to an AWG. The water-from-air resource can be thought of in the same way as a stream, pond, or aquifer. The water-from-air resource increases with increasing temperature and relative humidity. Most places on Earth where AWGs are likely to be operated have water vapour densities of 4 to 21 grams per cubic metre of moist air (red, green, and purple zones on the chart). The data for the chart is from the Atmospheric Water Vapour Resource Table (SI).

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Jalimudi Village (#India) #Water from Air Project

#Water from Air topics: Dew-point vs Temp vs Humidity in 3D

See the #water vapour resource in 3D !

Roland Wahlgren

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