I think that was my point...by slightly constricting the tube, you would
get a higher pressure through the heat exchanger, but lower flow.
Therefore, wouldn't the air going through linger longer in the exchanger
and pick up more heat?

Josh
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Kyrre Aalerud wrote:
>
> Flow is the result of the inverse relationship between pressure and
> resistance.  Thus, reducing pressure will reduce flow, reducing resistance
> will increase flow *and* reduce overall pressure.
>
> Try blowing through a pipe with your hand covering half the end.  Now do it
> again without the blocking.  You can use same ammount of force to move air
> through, but you will experience less pressure without the block, and higher
> flow.

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