Ron Soave wrote:
>
> The measure of how effective a heat exchanger is
> called, you guessed it, effectiveness. What that is
> is a ratio of how well the unit rejects heat divided
> by how well it could theoretically reject heat:
>
> eff = (T_hot_in - T_hot_out)
> ______________________
> (T_hot_in - T_cold_in)
>
I've never worked with effectiveness measurements, but I do know that
the total heat transfer in an exchanger is proportional to the surface
area, the flow of the cooling medium, and the differential temperature
across the exchanger. It seems to me that a radiator that restricts
enough air flow to make a difference would have to make that difference
up with the huge increase in surface area, or just not be a very good
design. What was the change which you seem to have experience with?
Good point about slowing down the flow. I've seen people try this and
quickly get confused as to why it's suddenly rebuild time...
--
MCMLXIX Sprite: She needs a man with a slow hand.
1990 GS 500-E: She needs a lover with an easy touch.
1987 RX-7 TII: She needs somebody.... Oops, nevermind!
"I don't like white people; they make too many generalizations."
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