Watair | Water-from-Air Technologies - Products

By: Watair  09-12-2011
Keywords: drinking water, pure water, Safe Drinking Water

The Watair, Inc.
The theme: Food, Jobs and Water!
while growing crops in a ONE ACRE size greenhouse, with our Atmospheric Water Generation and Water Treatment Technology.

* Pure water production 52,000+ Gallons/200,000 L/d (per 1 acre size) by condensing moisture from the air.
* Expandable technology; increase size and output to supply quality potable water through public utilities
* Sales of fresh water to local government, water tankers, breweries, water-bottling businesses etc…
* Sales of fresh fruits and vegetables to distributors, wholesalers, retailers, and value-added manufacturers
*  Canadian Int’l Development Agency (CIDA) Co-funded nine Feasibility Studies readying the       project for  implimentation

Watair’s Water-producing Greenhouse uses atmospheric water generation technology to produce its
own water for irrigating crops. Water not needed for irrigation can be used for potable water to serve the local population. Water is condensed from the air by using fans to blow the air over chilled coils made of copper tubing with food grade coated aluminum fins. The coils can be chilled by refrigeration gases or chilled water.

Brief History
In 2001, the Canadian International Development Agency (CIDA) approved a Contribution Agreement for a comprehensive viability study for a proposed facility based on our design for a water-producing greenhouse, which manufactures freshwater for vegetable crop irrigation. The reports, completed in 2003, addressed technical feasibility, financial and commercial viability, analysis of the regulatory framework, environmental impact, a training plan, gender issues and social integration, and ultimately, a joint venture agreement for operating a commercial greenhouse.

Warm ocean water trickles down cellulose pads that are located at the intake side of the enclosed structure. A gentle breeze created by fans at the rear of the structure blows ambient air  through the evaporator causing evaporation of the H2O. This cools the structure by evaporation enough to allow plants to grow in very hot climates similar to the old swamp coolers used in days gone by. This same evaporation process is repeated near the rear of the structure to preload the air with as much moisture (near 100% RH) as possible before it passes through the cold coils. These cold coils are cooled by cold seawater pumped from far below the surface where water is below the ambient air Dew point. This causes condensation of as much as 52,000+ Gallons/200,000 liters of water per day. 5-6% of this water is used for plant growth, the rest is available to bottle for distribution.

This natural coolant water is returned to the ocean with little or no change in salinity at a depth that matches the exit temperature, causing almost zero environmental impact.

System Options
Water-from-air systems for large-scale production (52,000+ Gallons/200,000 L/day) could use any of three methods to chill the coils which collect atmospheric water.
1. Refrigeration
2. Natural coolant—cold ocean water pumped from 980-1,960 ft (300–600 m) depths of the adjacent ocean.
3. Hybrid system using refrigeration to cool ocean water pumped from shallower depths.

Using refrigeration for chilling the water-collecting coils is the easiest route. Energy costs with Watair’s CI-2500 system are about 0.4 kWh per litre of fresh water produced. Our CI-2500 units can be ganged together to meet daily demands for irrigation and drinking. The power requirement for a single CI-2500 is 41 kW. Eighty units would be needed to produce 52,000 US Gallons/200,000 L/day with a total power requirement of 3280 kW.
Natural Coolant
In areas along he continental shelf it may be feasible to use large diameter hoses to pump water
to a greenhouse site. Use of natural coolant can reduce energy costs to about 0.2–0.3 kWh per litre.
Hybrid System
A hybrid system would have energy costs between the pure refrigeration and natural coolant options. The advantage would be to save capital costs by obtaining seawater coolant from shallower depths.

Keywords: drinking water, pure water, Safe Drinking Water