I would like your suggestions as to what points and how many
pitot tubes I should place.  In front and behind of course, but any
particular position - like 1" from fins at inlet entrance, center of

duct,

next to the walls, etc?

Ed Anderson

Divide the rad into four quadrants and put one pito tube (small copper

pipe)

in the center of each quadrant and one in the very center of the rad.
Static pressure taps can be right up against the core using porous
foam on the ends of drip irrigation tubing.

Believe me you will be both amazed and dumbfounded at the same time.
So far this has happened to both Tracy and Perry :)

Paul Lamar

Ok, next question.  I presume from the photo that this all goes in the

front

of the radiator and that the pito tubes are faced toward the radiator?
Thats the way it appears to me in the photo. If the front then, I'll

only be

able to instrument the unmodified inlet as the other one does not have
enough room to mount it between the "walls" of the duct and the fins,

except

perhaps in the middle of the duct.

The copper pipe looks to be about 1/8" dia, correct? I presume nothing
special has to be done to the opening except perhaps make sure its

deburred.

Ed anderson

I don't have a chunk here but when you go to the hard store buy  the drip
irrigation tubing first and see if it fits the copper pipe. As I recall
it may have been 3/16th copper. Buy some T's right angles and inline
connectors while you are at it. Very handy little things and cheap too.

You can do both. Put static pressure taps on both sides.
That will give us a feel for how much pressure difference is required
to result in X amount of air flow through a 3.5 inch thick evap core.
Done at different speeds we can plot a curve of flow verses pressure
difference.

Once we know that function we might find some info on evap cores that
will show us how many BTU's are dissipated as a function of the air flow
through the core.

Paul Lamar

Ok, got it.

Thanks

 
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