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Heat or AC?
03-28-2014, 10:00 AM
Post: #1
Heat or AC?
Have slab 99%/60F, 5 months old, done right (stego, no sand, drying top only) ambient is 47-63%/~65F during 72hrs, subfloor surface temp is 56F

They are ready to have AC or Heat running.

I know we want to have lower ambient air RH and in this building we have / will have when turned on RH controntrol of the ambient air.

BUT... do we want a high temp (heat - say 90deg) or cool (AC - say 70deg) for optimal drying conditions?
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04-02-2014, 08:18 AM
Post: #2
RE: Heat or AC?
Evan,
Warmer air will hold much more moisture than cooler air so you would look toward keeping the ambient conditions warm.
A unit of moisture found in a unit of warm air results in a much lower RH than that same amount of moisture in cool air.
You can look at a psychometric chart to see this relationship.
Moisture will always move to balance the relative humidity between the concrete and the surrounding air. So by keeping the air warm you lower its RH, and draw moisture from the slab more quickly than if the air were cool and had a correspondingly higher RH. Wink

JD Grafton
Concrete Answers for Flooring Problems
[email protected]
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04-02-2014, 08:26 AM
Post: #3
RE: Heat or AC?
Jason should do a video on the psychometric chart
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04-07-2014, 11:22 AM (This post was last modified: 04-07-2014 11:32 AM by eaadams.)
Post: #4
RE: Heat or AC?
A good primer on how to read one. I haven't read it (will take some time) but for the forum's benefit: http://www.powerknot.com/how-to-read-and...chart.html

PDF Imperial (F) - http://www.uigi.com/UIGI_IP.PDF
PDF Metric © - http://www.uigi.com/UIGI_SI.PDF

I've never seen a chart MORE in need of an ipad app.

But I still don't get how to read it for 'units of moisture'
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04-15-2014, 03:04 PM
Post: #5
RE: Heat or AC?
(04-02-2014 08:26 AM)eaadams Wrote:  Jason should do a video on the psychometric chart

Agreed

Stephen Perrera dba
Top Floor Installation Co.
http://www.tucsonazflooring.com
http://www.floorsavior.com
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