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Old 11-26-13, 11:02 PM   #26
Exeric
Apprentice EcoRenovator
 
Join Date: Aug 2012
Location: California
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Angry

I don't know what I was thinking when I said a few comments back that the attic and outside temps converged between 7 and 8 PM. They don't. The attic and "unconditioned space temps" converge at that time. The attic temperatures and outside temps usually never converge and the outside temps remain colder than the attic. I was so flummoxed by the lack of a big change with the attic vent being closed I think I was reaching for an explanation. That one day when the temp rise was only 27F seems to have been an aberation.

The day before yesterday I got an attic high of 97 and a outdoor high of 61. A new temp difference record. Here's a pic:


The vent being closed seems to be working on average. You just can't pinpoint when its contributing and when it's not. The long and short of it is that I was getting lost in the weeds while the average temps have improved. Overall the temps and temp rises for the last week have been quite consistantly over 90F and 30F respectively. And even when they fell short on the temp rise a 100F attic high temp is great! What was I worried about?

Today wasn't so good but then we're only 25 days or so from the winter solstice. Here's a pic:


The attic temps are still useable even on a bad day like this. (Rainy weather, forget it). So far things are on track for this plan to work, with or without mild disappointments. Even today it was over 75 degrees F in the attic from 1:00 PM to 5:00 PM. Again, what was I worried about?
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Last edited by Exeric; 11-26-13 at 11:09 PM..
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