>
> And you lose that wager!
>
> As the water gets to the end of the copper pipe (radiator), it is cool and
> thus not transferring much heat to the air.
=======
It transferred the heat to the air and the hand, in this case. That's the
point isn't it? To transfer as much heat as reasonable away from the
coolant, so that it can wick some more away from the motor?
=======
With the rapidly flowing water,
> you must catch it, reheat it and send it though the pipe again - to keep
the
> engine analogy.
=======
If the water's flowing rapidly, sufficient heat transfer can't take place,
ergo it's ability to absorb more heat is reduced.
=======
Since the rapidly flowing water is still hot at the end of
> the pipe, it is still transferring heat.
=======
Huh?! In a perfect system, 100% heat transfer would take place in the
radiator with ambient temp coolant returning to the engine. The t'stat would
regulate flow to maintain heat range.
=======
It is not an adequate test to
pour
> a gallon through slowly and compare that to a gallon poured through
quickly.
> You must run the test for the same time period.
=======
To flow the same volume at different rates for the same time period requires
that the pipe with the faster flow rate must be longer. Unfortunately, a
radiator has a fixed total volume transfer system.
=======
>
> Slow moving water will transfer a greater percentage of it's stored heat
per
> cycle through the radiator
, but fast moving water makes more cycles per
> minute. Since the Rate of heat transfer is a function of temperature
> difference (hot water vs air), hot water transfers more heat per minute
> than cool.
=======
At least we agree on something! :^))
With the faster flow rate less transfer takes place per cycle, with less
still every additional cycle. This is bad news for the motor.
If the water is hot, and the motor's hot, very little transfer takes place
because the difference is small.
In the situation of no t'stat, flow rate may be such that so little is lost
thru the radiator that the coolant is hotter than the motor, transferring
heat from coolant to motor, until equilibrium is reached. This is can happen
to race cars at rest for too long on the grid. With exotic alloy motors than
dump heat at a prodigious rate, like in F1, this occasionally cooks'im
waiting for the start light. And dragsters........
=======
You want the water at the bottom of the radiator to be hot for
> maximum dissipation of heat.
=======
Nope. As you pointed out, the greater the temperature differential, the
greater the transfer. Send hot water into a hot motor and little transfer
will take place. Since combustion chamber temps can reach 4500degF, I want
all the transfer I can get.
About that wager............
GM
>
>Mike and Candy Joehrendt
>
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