X-Mozilla-Keys:                                                                                 
Fred wrote:

Paul:

Compact heat exchangers was written as a general text for heat exchangers
used in aerospace applications and gas turbine recuperators.  It is the
definitive text for the gas side design.  On the liquid side, one has to go
to a traditional heat transfer text to compute heat transfer coefficients.

I also had problems getting information on antifreeze solutions, and so wrote
several manufacturers.  Only Texaco responded, and they faxed 13 pages of
curves of everything from specific heat and viscosity to refractive index?
Let me know what you want, and I will see what I can come up with.

Fred

Thanks for the offer Fred.

Just got back from the library with 40 pages of SAE papers
on radiators. Best SAE paper in the years 1990 to 1993 was the one 
Juergen Bax gave me. SAE 92078. Next week I will research the years
1993 to 1999 if I can find the SAE cumulative index by subject.

In those 40 pages there are tidbits of useful information such
as the design loads for car and truck rads. Not much but on
the other hand the design vehicle speeds are low as well.
That means the pressure difference and air flow across the rad 
is also low.

I don't know how all that scales to our situation
where we have 200 HP engines climbing flat out at
100 to 120 MPH. Whatever it is we are stuck for cost
reasons to using automotive cores. A custom core is totally
out of the question.

SAE paper 930475 is interesting as it is about what happened
when Continental tried to improve the BSFC of their liquid
cooled air craft engine by running it at a higher temp. 
All sorts of bad things happened in the cooling system such
as radiator clogging with mysterious white substances.

I am pretty sure about one thing however and that is keep it 
as thin as possible. The average difference in temp between 
liquid coolant and air is then a maximum. That in turn
means some kind of oblique or angled cooling block system 
is best.
 
Paul Lamar


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