# Re: Heat engine - Page 7

Posted by Gymn Bob on March 8, 2005, 12:07 am

Whoa! That is still northern Canada. I am on the same parallel with Boston
and northern California....LOL

Ontario, between Bufallo and Detroit.

Posted by Abby Normal on March 8, 2005, 3:02 am

Lol, grew up in Ontario between the Sualt and Winnipeg
Gymn Bob wrote:

changes.

35-37C,

Posted by Gymn Bob on March 8, 2005, 3:25 am
Close to WinterPeg eh?

Posted by nicksanspam on March 7, 2005, 4:17 pm

So, want to measure the air leakage this way? Less leakage helps with AC,
no matter what the system.

You might

1. Run a dehumidifier indoors for a few days with the cabin windows and doors
closed, to remove moisture stored in indoor surfaces.

2. Empty it, and measure the indoor and outdoor temps and RHs over 12 hours.

3. Measure how much condensation it collects.

4. Calculate the cabin air leakage as above:

Pao = RHo/100e^(17.863-9621/(460+To)) = 0.887 "Hg.
wo  = 0.62198/(29.921/Pao-1) = 0.0154.
Pai = RHi/100e^(17.863-9621/(460+Ti)) = 0.524 "Hg.
wi  = 0.62198/(29.921/Pai-1) = 0.0111.
cfm = 0.0185N/(wo-wi) = 30.

5. If cfm > 30, find and fix water leaks, caulk, airseal, and so on...

Nick

Posted by George Ghio on March 2, 2005, 4:18 am
nicksanspam@ece.villanova.edu wrote:

One does wonder, is this information anything like that for bilge pumps?

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