• Home
  • Selected Products (Amazon)
  • CanDew Products
    • Atmospheric Water Generator (2500 L/d) computer simulations
    • WaterProducer water-from-air system
    • Water-from-Air Greenhouse
    • Preliminary Studies for proposed projects using Water-from-Air and Atmospheric Water Generators
    • 'Classic' Reports for Water-from-Air and Atmospheric Water Generators >
      • Sample Page - WP drinking water plant for Cebu...
  • Markets
  • Technical Information
    • Technical Bulletin No. 1 Water-from-Air WaterProducer and Reverse Osmosis Desalination Compared
    • Technical Bulletin No. 2 Water-from-Air WaterProducer Cost, Features, and Benefits
    • Technical Bulletin No. 3 Carbonate Islands with Natural Coolant Resources for the Water-from-Air WaterProducer
    • Technical Bulletin No. 4 Comparing the Water-from-Air WaterProducer-Greenhouse to the Seawater Greenhouse
    • Technical Bulletin No. 5 Environmental impact of widespread use of drinking-water-from-air systems
    • Technical Bulletin No. 6 Potential and limitations of water-from-air systems for horticulture in greenhouses at four tropical sites
    • Water-from-Air International Lexicon
    • Water-from-Air Book
  • Countries with 50 Hz electrical services
  • Countries with 60 Hz electrical services
  • Management
  • Contact Us
    • Privacy Policy
  • CanDew Blog
  • Global Water Partnership
  • CanDew Shop
Canadian Dew Technologies Inc.
+1 604-985-3720

Atmospheric Water Generation Webinar Oct 20

7/10/2020

0 Comments

 
Picture
​Please join us for this webinar by registering at http://bit.ly/SGC-Oct20 where you will find additional information.
0 Comments

Privacy Policy

7/6/2018

0 Comments

 
Our Privacy Policy was updated.
0 Comments

#Water-from-Air Production Chart for #MexicoCity

13/3/2018

0 Comments

 
Picture of water-from-air production chart for Mexico City.
Water-from-Air Production Chart showing estimated water production from a WFC-3 60 Hz machine if it was operated in Mexico City. There would be no water production from December to March. Click on image to enlarge.
Water-scarce Mexico City is a challenging location for the operation of water-from-air machines that use mechanical dehumidifier technology. The high elevation (2,233 m) means that for its latitude, the water vapour density of the ambient air is quite low, with the annual range from 5.8–9.8 grams of water per cubic metre of moist air. Because the water-from-air resource is low, the machine's water production is low compared to the manufacturer's rating. Therefore, the energy cost of the water is relatively high, averaging 1.14 kWh per litre of water produced during the April to November operating season. Nevertheless, there may be certain businesses that would find the an additional source of clean, fresh water useful and worth the premium. Examples include restaurants, food manufacturers, clinics, and hotels.

To find the machine refrigeration capacity (in tons of refrigeration*) needed for various water production capacities we can take advantage of the linear relationship between water production and refrigerating capacity. In the WFC-3 example here—and accepting the shortened operating season from April to November—we see that water production of 45 L/d (see text box on the right of the graph above) needs 3 tons of refrigeration capacity. Or, we can say that 15 L/d needs 1 ton of refrigeration capacity. We can construct the following table:

1 ton produces 15 L/d
10 tons produces 150 L/d
100 tons produces 1500 L/d
1000 tons produces 15,000 L/d

The largest machine manufactured by Water Technologies International, Inc. is the WFC-200 with 200 tons of refrigerating capacity. Therefore, to produce 15,000 L/day would require five WFC-200 units whose current price (ex works) is USD 421,200 each.

To avoid unsustainable up-front capital costs for water-from-air projects, it can be advantageous to recognize that installations need not be centralized (because water in the air is everywhere). Rather, smaller machines can be purchased as funds allow and be installed gradually in networks of independent machines serving the populations of neighbourhoods.

*ton of refrigeration = Refrigeration power needed to melt 1 ton of ice per 24 hours (288,000 Btu per day, 12,000 Btu per hour) = 3.517 kW
0 Comments

New Technical Report: "#Water Test Results"

12/1/2015

0 Comments

 
Cover of
Click on image to go to the CanDew Shop where you can purchase this report.
The purpose of this document is to provide some detailed examples of the water quality that can be expected from the liquid water produced by processors of atmospheric water vapour. The prospective user of water-from-air systems can then evaluate the suitability of this unique water resource for their applications.

Comprehensive water test results obtained during field trials at four different locations demonstrate the water quality characteristics of water-from-air systems. The four locations are:
  • Surrey, British Columbia, Canada
  • Sydney, Nova Scotia, Canada
  • Belize City, Belize (Central America)
  • Bangkok, Thailand
The tables in the report summarize the four water test results for microbiology and chemical analyses. Copies of the complete analysis documents as received from the laboratories are shown in the Appendices. Names of our clients were removed for privacy.
0 Comments

CanDew Shop improves access to #water-from-air digital goods!

4/11/2014

0 Comments

 
CanDew has some interesting digital products related to water-from-air technologies. These used to be scattered throughout the site but have now been collected into a series of easy to use online shopping pages. It's like a candy shop for people interested in water-from-air information—hence the name CanDew Shop!
0 Comments

    Roland Wahlgren

    Physical Geographer (BSc Univ. of British Columbia; MA Carleton University)
    • Researched water-from-air technologies since 1984
    • Principal, Atmoswater Research; President, Canadian Dew Technologies Inc.
    • Caribbean field experience—Canadian International Development Agency project, Turks & Caicos; Water-from-air system commissioning project, Belize

    Archives

    October 2020
    June 2018
    March 2018
    January 2015
    November 2014

    Categories

    All

    RSS Feed

Copyright 2003–2023, Canadian Dew Technologies Inc.