Series or parallel?

Butcher · 11-16-2001, 07:02 AM

Given the high static back pressure of radiators, is it better to have a dual fan setup with one pushing and one pulling (series) or both in parallel?

11-16-2001, 10:06 AM

by parallel I assume you mean one fan blows into the other. This is not optimal unless the two fans spin in opposite directions. Think of it like this... the air is already spinning around from the first fan so the second fan is going to spin it more in the same direction, reducing the effectiveness of the 2nd fan. If the second fan spun in the opposite direction, then it would be spinning the wrong way-- increasing the efficiency of the 2nd fan. But unless you have such a setup, it is best to put the rad in the middle... the rad acts as a straightener so the 2nd fan gets straight air, not a vortex.

redleader · 11-16-2001, 03:16 PM

Iron: Serial means one blows into the other.

Parallel would be two fans side by side. This is the best way to go, but you need a big-ass rad to fit dual 120mm fans.

Butcher · 11-16-2001, 03:19 PM

The theory behind it is that series fans are apparently (I'm quoting Sunon here), better with high static pressure, rads have high static pressure. On the other hand parallel fans work somewhat better in general so maybe that's the way to go.

As for dual 120s, heard of ducting?

11-16-2001, 08:23 PM

Ah. I was thinking of two fans and a 1 fan size radiator. my bad

11-16-2001, 07:02 AM	#1
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	Series or parallel? Given the high static back pressure of radiators, is it better to have a dual fan setup with one pushing and one pulling (series) or both in parallel? __________________ Once upon a time, in a land far far away...

11-16-2001, 03:19 PM	#4
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	The theory behind it is that series fans are apparently (I'm quoting Sunon here), better with high static pressure, rads have high static pressure. On the other hand parallel fans work somewhat better in general so maybe that's the way to go. As for dual 120s, heard of ducting? __________________ Once upon a time, in a land far far away...

11-16-2001, 10:06 AM	#2
IronHelix Guest Posts: n/a	by parallel I assume you mean one fan blows into the other. This is not optimal unless the two fans spin in opposite directions. Think of it like this... the air is already spinning around from the first fan so the second fan is going to spin it more in the same direction, reducing the effectiveness of the 2nd fan. If the second fan spun in the opposite direction, then it would be spinning the wrong way-- increasing the efficiency of the 2nd fan. But unless you have such a setup, it is best to put the rad in the middle... the rad acts as a straightener so the 2nd fan gets straight air, not a vortex.

11-16-2001, 03:16 PM	#3
redleader Thermophile Join Date: Jun 2001 Location: The deserts of Tucson, Az Posts: 1,264	Iron: Serial means one blows into the other. Parallel would be two fans side by side. This is the best way to go, but you need a big-ass rad to fit dual 120mm fans.

11-16-2001, 08:23 PM	#5
IronHelix Guest Posts: n/a	Ah. I was thinking of two fans and a 1 fan size radiator. my bad

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