What fascinating information. I have been trying to determine how to make
my house more energy efficient, especially during the summer. Roland, I
wish you lived in Las Vegas so I could tap into your expertise. Thanks for
writing this.
Gail
----- Original Message -----
From: "Roland Wiench" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Saturday, October 12, 2013 1:33 PM
Subject: Re: [EVDL] Another method of heating a EV
In Civil Engineering, I study the heat lost of building materials. So
when I built my first house I apply this science to my house.
R-Factor is the resistance of a material to heat lost. One R factor is
derided from the heat lost difference of one side of a 1/8 inch of glass
to the other side.
Let's say you build a structure all of 1/8 inch of glass which is a 10
foot cube. The floor would be 10x10 = 100 sf, also the ceiling at 100 sf
and the walls at 100 sf. This is 6 x 100 sf = 600 sf of all external
surfaces between the outside ambient temperature.
Known: 1/8 of glass = 1 R factor
SF of external areas = 600 square feet
Temperature Difference (TD) in F. between the glass areas.
Normally we
use 100 degree temperature difference in a standard building
structure to
maintain a interior temperature at 70 F. with a exterior
temperature of
- 30 F below.
Conversion: We have to convert the R factor in a U Factor by dividing the
R factor
in to 1 or (1/R)
The Formula: Btur's = SF x U-factor x TD
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