Sv: Alum. vs Copper RE: I need a radiator for an 88 80q , where to buy?????

["Claus Vegener" <vegener@post7.tele.dk>]

Avi
Well, I don't know about cars - my approch is from my job
HVAC (ventilation) and cooling so it more common theory.
But as my A/C condensator is leaking (an Al / Al ?) I will find out
in the future, when I am going to replace.
But using Brass would surprise me due to weight and
even lower thermal conductivity.

Kind regards Claus

Oprindelig meddelelse -----
Fra: Avi Meron <avi@cosmoslink.net>
Til: Claus Vegener <vegener@post7.tele.dk>
Sendt: 26. juli 1999 07:31
Emne: RE: Alum. vs Copper RE: I need a radiator for an 88 80q , where to
buy?????


> Claus,
> Most replacement radiators (not alum.) are brass not
> copper...............(as far as I know),
> Take care,
> Avi
>
> -----Original Message-----
> From: owner-quattro@audifans.com [mailto:owner-quattro@audifans.com] On
> Behalf Of Claus Vegener
> Sent: Friday, July 23, 1999 5:45 PM
> To: quattro audifans
> Subject: Sv: Alum. vs Copper RE: I need a radiator for an 88 80q , where
to
> buy?????
>
> Talking Thermal Conductivity Kenn is right, but the biggest problem
> in heat transfer is not transfer of the heat from the innerside of the
> CU or Al tube through the metal and to the outher side of the finns.
> It is the crimping of finns CU or Al to the inner tube and the
> extern heat transfer coeffcient [W/(m2 * dT)] for the air, which is the
> heavy one.
> And besides:
> The resulting effectivity of  fin's of equal sizes depends on the square
rot
> of
> their thermal conductivity. Hense the advantage of Cu to Al is
> (390/239)^.5 = 1.28
> The Cu fins should be 28% better but is more heavy and more expensive.
> So look at the area, number of fins and the tube surface, if you have to
> compare 2 radiators.
> In the first step from inner tube to outer tube the material don't matter.
>
> Kind regards Claus
>
> ----- Oprindelig meddelelse -----
> Fra: Kenn Thyrsted <thyrsted2@olsy.dk>
> Til: Avi Meron <avi@cosmoslink.net>; <River6822@aol.com>
> Cc: Quattro <quattro@audifans.com>
> Sendt: 24. juli 1999 00:30
> Emne: Re: Alum. vs Copper RE: I need a radiator for an 88 80q , where to
> buy?????
>
>
> > Actually Copper is better than Aluminium.
> > Cu=390W/(m*deg)
> > Al=239W/(m*deg)
> >
> > Ordinary Brass (Yellow) is 112W/(m*deg)
> >
> > /Kenn
> > ----- Original Message -----
> > From: Avi Meron <avi@cosmoslink.net>
> > To: <River6822@aol.com>
> > Cc: Quattro <quattro@audifans.com>
> > Sent: Friday, July 23, 1999 7:26 AM
> > Subject: Alum. vs Copper RE: I need a radiator for an 88 80q , where to
> > buy?????
> >
> >
> > > Scott,
> > > Aluminum dissipate heat much better and faster than brass or copper,
you
> > can
> > > get away with an alum. rad. that is smaller than brass, that is one of
> the
> > > main reasons while most (almost all)OEM radiators and AC evaporators
are
> > > made out of alum.
> > > If you have difficulty with my statement try to heat a copper pipe and
> and
> > > alum, pipe, you will find out very quickly which material conduct heat
> > > better. The only advantage that brass has over alum. (rad.) is
> durability.
> > > Avi
> > >
> > > -----Original Message-----
> > > From: owner-quattro@audifans.com [mailto:owner-quattro@audifans.com]
On
> > > Behalf Of River6822@aol.com
> > > Sent: Thursday, July 22, 1999 7:51 PM
> > > To: obin_olson@hotmail.com; quattro@audifans.com
> > > Subject: Re: I need a radiator for an 88 80q , where to buy?????
> > >
> > > You will not find a new radiator for less than $175. I put one in my
88
> > 80q
> > > about 6 months ago. What a PITA. I got mine from a local radiator shop
> > that
> > > carried a generic brand-- i'm not sure of the name. The shop is in
> Glasco
> > > NY,
> > > I don't know where you are located. Anyway, I know it was not a
Modine.
> > >
> > > The radiator is a copper core, the original is aluminium. Don't let
> > anybody
> > > fool you, copper disappates heat faster than aluminium. It has been
> > working
> > > fine and the running temperature is below what the old radiator ran
at.
> > >
> > > Hope this helps.
> > >
> > > Scott Calabrese
> > > 88 80q
> > > http://members.aol.com/river6822
> > >
> >
>
>