Evaporative Roof Coating

Ride the
Wet-bulb Depression
to significant energy savings.
This Earthen Rock Matrix combined with water is designed to cool your roof below ambient air temperature saving you money. The Matrix of Stone helps protect structures from fire and is extremely durable to the sun's relentless solar energy transmission.Cooling Traditional Solar Heated Rooftops (residential, commercial, government) to near local wet bulb temperature provides inexpensive solar thermal protection powered with only fresh or salt water. The matrix can be bonded with portland cement.
Natural and/or Processed Hydrophilic Earthen Minerals (water loving rocks) formed into an air-water interface matrix will track only a few degrees above local wet bulb temperature with the addition of water. The wet bulb temperature is lower than ambient air temperature, except during rain. Water is added periodically to maintain hydration and wet bulb temperature tracking.
Plunging night time wet bulb temperatures provide night time cooling. A reservoir of water cooled near night wet bulb temperature can be used for thermal conditioning during daytime heat. The matrix can be part of a thermal energy transfer system from one part of the 24 hour day to another.




What Wet Rocks Do and How

Our human history almost starts with the MUD HUT, a medium for wet bulb temperature thermal protection. Our ancestors started the practice of wetting earthen material (mud) for thermal cooling. Today nearly half a billion farmers in the Indian sub-Continent cover roofs with mud to combat the monsoon heat.

Wet Rock Cooling is as simple as:

1. Spray the Adhesive

2. Spread the Wet Rocks

3. Set Up the Soaker Hose System

Bonding a layer of Wet Rocks on the roof and adding water will track the Local Wet Bulb Air Temperature. Wet Rock Cooling keeps a temperature lower than air temperature. Wet Rocks track a few degrees above local wet bulb air temperature and rarely exceeds 33*C - 90*F. Nighttime cooling to 24*C - 75*F in sub tropical summer conditions.

Direct solar thermal heating of building rooftops exceeds 60*C (140*F) daily nationwide during the summer. Wet Rock Cooling will have roofs at a mid-day operational temperature of 30*C (86*F). This solar energy barrier blocks the suns direct heating. Wet Rock Cooling presents you with the opportunity to make the simple change from 140*F to 86*F (60*C to 30*C) using only recycled municipal water, fresh or salt water. Wet Rocks are inexpensive and very UV stable.

The absorbency of DE - diatomaceous earth ( 2 X its weight w water) is a result of porosity with high surface area, water fills the rocks. Perlite (4 X its weight w water) is the white floating rocks in potted plant soil and it bonds all water to its exterior. While perlites' bright white color reflects more solar energy then sand colored diatoms when dry, wet perlitle and diatomaceous earth both track a few degrees above the local wet bulb temperature. Both rocks are hydrophilic, water loving, and as rocks are stable in the sun's rays.

Matrix + Water = Total

DE - diatomaceous earth 880g / sq. m 1760g 2640g / sq. m

Perlite 440g /sq. m 1760g 2200g / sq. m

Benefits DOE Because . . .


The theorem of producing electrical energy for cooling while admitting green house gases is flawed. Our planet is heating and populating, meeting increasing demand for cooling does not benefit humanity or the US DOE if carbon fuels are burned in a never ending cycle.

Peak loading is a pressing concern for DOE. Wet Rock Cooling takes electric cooling load offline by transferring solar energy into water vapor instead of heating the building. Our national grid can be relieved of the stress of peak afternoon loading onto the water system and Wet Rock Cooling. Existing buildings HVAC systems can save energy with the buildings' mass tracking local wet bulb temperature.


Wet Rocks cool 24-7, except during rain and fog. They eliminate or offset the cost of cooling structures across the DOE's extensive range of interest worldwide. Cooling system can be shut down by not adding water. Evaporating water is easy, that's what nature does through every green leaf and pond.

Wet Rock Cooling works with water not burning fuels. President Obama calls for new ideas like this one. It is hard to argue that creating cooling without green house gases is better than the other way around, for the DOE and everyone on the planet.

Wet Rock Cooling Meets the DOE Mission on These Points

Energy Security: Promoting America's energy security through reliable, clean, and affordable energy.

Wet Rock Cooling is powered by a renewable energy, Water (fresh, salt, re-use). Infrastructure exists to bring fresh water to almost every home and business in the US, re-use lines are expanding nationwide in urban-suburban areas. Cooling with Water is cleaner then burning Coal to cool.

Scientific Discovery and Innovation: Strengthening U.S. scientific discovery, economic competitiveness, and improving quality of life through innovations in science and technology

Wet Rock Cooling is a mud hut based innovation using UV stable modern materials. Economic competitiveness is achieved directly by reduced cooling energy costs of current home and business operations. Thermal protection from summer heat will improve the quality of life of Americans and American Business' without the electric bill.



Calculating Wet Bulb Temperature

Read across the Temperature chart, in red, to locate your area's temperature. Next read down the left column, in blue, to locate your area's Relative Humidity. Read down the temperature column and across the humidity row to find you local wet bulb temperature.
Use this link to see examples, Using the Charts:

Click here to see the World Temperature Map


Wet Bulb Table

Relative Humidity

Air Temperature in *C

100 50 45 40 35 30 25
80 46 41 37 32 27 23
60 42 37 33 28 24 20
40 36 32 28 24 20 16
20 29 26 22 19 16 13


Wet Bulb Table

Relative Humidity

Air Temperature in *F

100 110 100 90 80
80 104 94 85 73
60 96 87 79 70
40 87 79 72 64
20 76 70 93 57


World Temperature Map



Use the map below to find your approximate wet bulb temperature.


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Examples

Wet Bulb Table


For example, Las Vegas has a summer mid day high temperature of 100F and relative humidity of 40%. Following the chart you can see that the area's Wet Bulb Temperature is 79 degrees Fahrenheit.

Relative Humidity

Air Temperature in *F

100110 100 90 80
80 104 94 85 73
60 96 87 79 70
40 87 79 72 64
20 76 70 93 57



Wet Bulb Table


In this example, our city has a temperature of 40C and relative humidity of 40%. Following the chart you can see that the area's Wet Bulb Temperature is 28 degrees Centigrade.

Relative Humidity

Air Temperature in *C

100 50 45 40 35 30 25
80 46 41 37 32 27 23
60 42 37 33 28 24 20
40 36 32 28 24 20 16
20 29 26 22 19 16 13

More Examples

Let's take random Summer Mid Day High Readings
Location
Temp F
Relative Humidity
Wet Bulb Temp
Palm Springs
110
20%
76
Las Vegas
100
40%
79
Washington DC
90
60%
79
Sacramento
90
40%
72
El Paso
110
20%
76
New Orleans
100
60%
87
Atlanta
100
40%
79
Tampa
90
60%
79
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Binding Agents

Portland CementExtremely effective and inexpensive for bonding Wet Rocks.
Asphalt EmulsionThe mixture of water and asphalt turn into an emulsion. Asphalt emulsions are used in a wide variety of applications, like bonding Wet Rocks on top of roof shingles.
AdhesivesEpoxy
GravityWet Rocks are stable without adhesives in moderate wind conditions.





Watering System
A Soaker Hose or other low profile irrigation system along the peak of the roof supplies the water neccessary to activate the cooling system.




Patent Pending

Copyright 2010
John Flaherty
(941) 539-7945