Aftercooler Gains

[Bob Wooten]

load to HP advantage aside, there is another issue as well.  I was tooling
across Texas with my buddy in his 72 Grand Prix, with the AC blowing, Life
was good.  The compressor turned on (cycling as it does) & the torque that
it took to get the compressor turning as we were doing 70 snapped the belt.
it took about 3 or 4 seconds to smoke but when it did sounded like we had a
cat under the hood.  needles to say changing the belt on a hot motor in the
Texas sun was not a pleasurable experience, but the rest of the trip w/o AC
would have been worse (just cause I would had to listen to him complain the
rest of the way).  The next town we got another belt & Life was good again.
Imagine this happening @ a buck 50 with the super-whammy-dyne compressor &
you are going to think that the world is coming to an end.

BW

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Greg Hermann
Sent: Tuesday, April 17, 2001 6:23 PM
To: diy_efi at diy-efi.org
Subject: Re: Aftercooler Gains



>
>By the way, does anyone have any real AC compressor figures to examine, at
a
>variety of full load shaft speeds?

Yeah, but it would prolly go over the limit for a post! Compressor HP will
vary with suction pressure, condensing temp/pressure, compressor
displacement, and compressor speed. At "normal" AC conditions, say 35
degree suction temp and 135 degree condensing temp, you can figure ROUGHLY
1 HP compressor power per 12,000 BTUH of cooling effect. With higher
suction temps, a given displacement/rpm compressor will have a higher
"capacity" and pull more HP to drive it--because the refrigerant gas will
be more dense at the higher suction temp.

There are LOTS of variables!

Perhaps the numbers for a 200 HP compressor at 0 F suction and 110 F
condensing at 1200 rpm,using NH3 refrigerant would be of interest?? :-)

That 20 HP number wasn't too unrealistic for the conditions and load
mentioned!

Greg
>
>Your math is probably correct, don't rely upon mine at this point.

See my prio post about the math--it wasn't.
>
>Since you appear well adept with thermo crunching, what do you specifically
>think of the air/dynalene/freon hybrid intercooling system found at
>www.coolflow.com?  Would be very interested in hearing your thoughts.
>
>
>Thanks;
>Walt.
>
>---------------------------------------------------------------------------
-
>To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org


----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org