|
Al, I went back to some of my spreadsheets and I have for
constant pressure (Cp) as
0.25 BTU/Lbm/F
Here is web site which gives it as 0.241 BTU/LBM/F at 32F
Sea Level
So looks like you have the decimal off a bit.
Sorry, it took me so long, been out at the aircraft all
day putting on the new right gear leg, and brakes, etc.
Ed A
----- Original Message -----
Sent: Friday, October 21, 2005 2:59
PM
Subject: [FlyRotary] specific heat of
air
Ed, or Bill, or somebody; help
me out here. I was reviewing my calcs for air flow requirements, and
find I used 0.02 Btu/cu. ft –F for the specific heat of air. I don’t
know where that came from, and can only find it in joules/Kg – K. By the
time I do all the conversions to British units and mass to volume I now get
quite a different number.
What is a good number for air at
about 1 atmosphere and, say 90F; in Btu per cu ft per degree
F?
Thanks,
Al
|