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Old 01-27-13, 05:49 PM   #373
ham789
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Join Date: Dec 2011
Location: tigard, oregon
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Ok, I'm still a little confused. Sounds like the solid PP
is identical sheets of coroplast rotated 90 degrees.
There are two problems with that. First, the thickness
of the conductive path is double. But, I think an even
bigger problem is the bad contact between the sheets
over their full area. Air in the middle is a killer.

Efficiency (%)= (T4-T1) / (T3-T1)x100
My formula works out to be
100x(T4-T1) / (T3-T1) which is the same as yours
with an additional parenthesis pair.

I think your efficiency measurements are way optimistic
for that configuration. Having very low air flow certainly
contributes, but even so...

I have myself convinced that the dual-core cross flow
exchanger is more efficient, but not because of more area.
Yes, for imperfect materials, more area helps, but the
theory suggests that a dual core of the same effective
surface area as a single core will still be significantly
more efficient...at the cost of higher back pressure for the
same flow.

I gave up on any configuration of cross flow and went
straight for the counterflow. It's easier to construct
and has potentially better performance.

I'll post some pictures.
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