iiyama
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| posted on 7/4/07 at 01:20 PM |
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Fan mounting
Is there any benefit to mounting a fan one way or 'tother? ie front of rad as a blower or back of rad as a puller?
Pro's and Con's?? or just no difference?!
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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JoelP
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| posted on 7/4/07 at 01:46 PM |
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if your fan has curved vanes then it is designed to be one or the other, straight vanes can go either way. If curved, shallowest part of the blade
should be the leading edge.
If i had to choose id say put it in front, less chance of the fan motor overheating. Not much in it i guess.
[Edited on 7/4/07 by JoelP]
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iiyama
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| posted on 7/4/07 at 02:23 PM |
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Its a pacet fan and can be mounted on either face of the rad. Just wondered if either way was more efficient.
Interesting point about the fan motor though!
Seems if I mount it on the forward face then it will protect the rad from any debris, (the grill should do that though!), but if I mount it on the
rearward face the rad is unobstructed and I would have thought a litte more efficient.
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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Confused but excited.
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| posted on 7/4/07 at 03:39 PM |
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The fan will be more efficient if it is pushing air, rather than sucking it. This is because the air passing through the radiator will be slightly
above atmospheric pressure, therefore denser and thus having greater thermal capacity, so will carry more heat away from the radiator. Whereas if it
is sucking the air will be less dense etc.
[Edited on 7/4/07 by Confused but excited.]
Tell them about the bent treacle edges!
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iiyama
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| posted on 7/4/07 at 03:49 PM |
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Can you explain a little more in depth?? Not doubting you at all, just interested!! 
Above atmospheric? Why? Because of a build up of air against the face of the rad??
Can understand it being denser now you mention it because of it being cooler before it goes through the matrix.
Actually makes life a little easier putting it on the front!
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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richard thomas
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| posted on 7/4/07 at 03:51 PM |
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If the air has been raised above atmospheric pressure, then the temperature will have increased as well....
It could be that the air velocity is simply being increased, in which case the pressure will drop.
[Edited on 7/4/07 by richard thomas]
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Confused but excited.
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| posted on 7/4/07 at 07:27 PM |
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Correct, according to Boyle's Law, but by how much? Probably not a significant amount.
Empirical results seem to indicate that for a given radiator/ fan set up, the cooling effect is more pronounced if the fan is fitted in the front of
the radiator, pushing air through it.
If anyone has definitive information with regard to this subject, I too would be interested.
[Edited on 7/4/07 by Confused but excited.]
Tell them about the bent treacle edges!
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richard thomas
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| posted on 7/4/07 at 08:31 PM |
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Agreed, the amount of change we are talking about here is insignificant.
However, the fan is not in constant operation, and when the radiator is cooling by 'ram' air whilst the car is in forward motion surely it
is better to have the fan behind - giving more radiator surface area to clean airflow?
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pewe
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| posted on 7/4/07 at 08:44 PM |
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It's also worth bearing in mind that the closer the fan sits to the rad itself the more efficient it is i.e. less spillage around the edges.
Cheers, Pewe.
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iiyama
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| posted on 7/4/07 at 09:40 PM |
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quote:
Originally posted by richard thomas
Agreed, the amount of change we are talking about here is insignificant.
However, the fan is not in constant operation, and when the radiator is cooling by 'ram' air whilst the car is in forward motion surely it
is better to have the fan behind - giving more radiator surface area to clean airflow?
Thats my way of thinking too........
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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