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- Homeowners can walk on the mats
- Less plastic waste
- Shorter set up times – less labor hours billed
- Energy Efficient – Self limiting equipment
- UL Approved equipment – Safety
- Less Demo – More in place drying – Saves insurer money
- Faster Drying times – Based off Daltons law of Evaporation – Close files quicker
The Equation that Matters Most in Water Damage Restoration
Having a background in
Mechanical Engineering, facts and equations has always been my
interest. As I started my career in the restoration industry I didn’t
see a whole lot of facts or scientific equations that proved people
in the industry were drying structures the correct way. I received a
whole lot of the same explanation: “This is the way we have always
done it”. So many people are comfortable with the norm because it
“gets the job done”, instead of understanding the science of how
water evaporates. It finally saw it when I listened to a presentation
given by Jeremey Reets and it baffled me to see how many people
didn’t understand/know Dalton’s Law of Evaporation (Law of
partial pressures). Dalton’s Law of evaporation is as follows:
Where E is the evaporation rate, U is
m is vapor pressure of the material, and ea
is the vapor pressure of the ambient air.
How can you manipulate this equation to increase the rate of evaporation in your drying chambers?
In regards to air speed, stop thinking of fans in terms CFM and start thinking in terms of velocity. Its simple, increase airspeeds and you will increase the evaporative rate.
The next piece we need to manipulate is e m. How do we manipulate the vapor pressure of the material? What do you know, this is also a simple answer: increase the temperature of the material. Increasing the temperature of a material by 18 o F can double its vapor pressure.
Finally, manipulating the vapor pressure of the ambient air. Every technician takes these reading on every job (or at least they should): Temperature and Relative Humidity. These readings don’t matter as much in comparison to what they yield in the calculation of GPP (Grains per pound; How many grains of water per pound of air). GPP is important in this equation because of its relation to vapor pressure: the lower the GPP in your drying chamber the lower your vapor pressure.
In summary: High airspeeds, heat up the wet materials, keep your GPP low.