| [GMCnet] John Biwersi's new direct replacement fan [message #269038] |
Tue, 06 January 2015 18:17  |
Advanced Concept Ener
Messages: 112
Registered: December 2014
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Senior Member |
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I would like once and for all to put the idea of increased fan efficiency to bed. Lets assume that we want a 25% increase in air flow to make it worth while changing the fan. A 25% increase in air flow would, by the fan laws, increase the HP by 240% (1.25 cubed) Forget for a minute the fact that the pressure must also go up to move that air and HP increases by the square of the DP. That means that the efficiency of the fan must increase by 240% to break even on HP requirements. Only God knows how to increase the efficiency of a propeller fan blade by that much.
Now for Jim B question. You know me and my coach Jim and I would install the fan in a heart beat to decrease the noise which I firmly believe it does based on the feedback from this site. The fact that it decreases the moment arm on the water pump due to decreased weight is also a plus. But again I state that if you can control the speed of the fan to deliver just the right amount of air that keeps the oil cool while satisfying the water jacket temp requirements will deliver maximum efficiency and therefore minimum HP (fuel) requirements. If someone can get me the info on the electrically variable clutch that works on our units I will figure out the most simple control system , install it on my coach, test it and share the solution. The HP is to be saved by optimizing the quantity of air pumped across the radiator at any given load.
Jon Darcy
aces4nrg@gmail.com
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