Cooling

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outdoors4evr
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Re: Cooling

Postby outdoors4evr » Fri Jun 03, 2016 7:08 am

At least the electric cooling fan could be put on a thermostat and wouldn't run much during the winter.
A lot of the electric fans have a high and low rpm for more or less cooling. Not sure whether this would consume less power as some probably just use a resistor to lower the voltage.
Has anyone calculated the CFM of the Farmall Cub fan running at high idle?
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Jim Becker
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Re: Cooling

Postby Jim Becker » Fri Jun 03, 2016 11:37 am


Crimson Tim
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Re: Cooling

Postby Crimson Tim » Fri Jun 03, 2016 1:20 pm

Good article.
Also, there are efficiencies involved. You can convert one form of energy to another, but each time you do, you will lose some of it due to friction, turbulence in fluids, incomplete electromagnetic coupling, etc. This often shows up as heat being given off.

Just running the fan from a belt off the engine, you have one conversion of chemical energy (gas) to kinetic in the engine, then friction losses of one v-belt, plus the internal friction of engine and fan bearing.

To run an electric fan you have more or less these same losses, plus now you are converting kinetic energy to electrical at the alternator, then back to kinetic at the fan motor, so you've introduced two efficiencies that will be less than 100%.

The only way this will come out ahead is when the fan can be shut off when not needed. For those of you plowing snow in the winter, that would make some sense. I think during the heat of summer, though, the fan would probably never shut off once warmed up. Certainly, a Cub will never be traveling fast enough to cool itself with the ambient headwind except in winter.

In any case, I don't think the difference would be large enough to matter either way IMO.

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Re: Cooling

Postby Jim Becker » Mon Jun 06, 2016 9:26 am

For a bit more on the charging system aspects of this thread, here is an old discussion where Stanton just posted a follow-up. If you want to get an abbreviated version, just read Stanton's posts that explain the original problem, what things were tried, and the final resolution.

viewtopic.php?f=1&t=85815


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