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Fans for heater cores?

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neo86

Member
Joined
Mar 20, 2001
I've seen a lot of ppl using multiple fans for their heater cores. My question is :

Are 2 fans really better than 1? If so by how much?


P.S Anybody know where to get those 131 cfm panaflos for cheap (just in case :))?
 
OP
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neo86

Member
Joined
Mar 20, 2001
*bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbuuuuuuuuuuuuuuuuuuuuummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmpppppppppppppppppppppppppppppppppp*
 

stool

Senior Member
Joined
Dec 20, 2000
Location
Albany, NY
I am using an Orion 172mm110 VAC fan on the radiator, which by itself pumps out 235 CFM, so I don't need 2. I think most use 2 fans simply because there is room to do so, and the higher airflow means more cooling.
 

Hoot

Inactive Moderator
Joined
Feb 13, 2001
Location
Twin Cities
neo86 said:
I've seen a lot of ppl using multiple fans for their heater cores. My question is :

Are 2 fans really better than 1? If so by how much?


P.S Anybody know where to get those 131 cfm panaflos for cheap (just in case :))?

First off, you don't need 131cfm fans for your radiator. I use a pair of Panaflo 120x38mm 85cfm fans in a push-pull sandwich array. I can reduce their speed even further using a rheostat and it has very little impact upon the inlet water temperature. What it boils down to is how much of the air from a fan makes it through the radiator and out the other side, versus hom much blows out the back of the fan as a function of how well that particular fan deals with resistance to air flow. Thicker, more effective radiators offer more resistance to air flowing through them. Thicker fans, IE 120x38mm versus 120x25mm deal better with resistance to air flow. On my setup, I do not feel any air slipping back out the intake side of the pushing fan. If I remove the pulling fan, more air slips past the blades and out the intake side of the pushing fan. That's air that could be cooling the radiator. Lastly, one of the compelling reasons for using water cooling is the cooling effectiveness it offers with less noise. Those 131cfm fans are considerably louder than an 85cfm fan, especially when it is slowed down more with a rheostat. FWIW, Sunon now makes an almost identical fan to the Panaflo, both in thickness and cfm, for a few dollars less.

Hoot