How do I relate the backpressure of a radiator to a flow curve for a fan?

redleader · 12-14-2002, 12:26 AM

BillA gives some nice data here about heatercores:

http://www.thermal-management-testin...esting%202.htm

(Second chart down)

However he simply lists the static pressure needed for a given air flow.

Looking at fans OTOH, the pdfs typically list the flow at a given backpressure. Sadly I'm not smart enough to relate the two. Could someone help me out with some formulas?

Also, heres a PDF for reference. I'd love to try out these 127*127*52mm fans. The static pressure these things generate is simply amazing. Not to mention they're almost the exact size of a heatercore.

http://www.nidec.com/fanpdfs/c2002_3939.pdf

Thanks.

Edit: Bad link.

Alchemy · 12-14-2002, 02:34 AM

Try using Excel. Plot a pressure vs. flow line for the rad and another pressure vs. flow line for the fan. The point they intersect will give you the pressure drop and flow rate you'll see.

Alchemy

12-14-2002, 12:26 AM	#1
redleader Thermophile Join Date: Jun 2001 Location: The deserts of Tucson, Az Posts: 1,264	How do I relate the backpressure of a radiator to a flow curve for a fan? BillA gives some nice data here about heatercores: http://www.thermal-management-testin...esting%202.htm (Second chart down) However he simply lists the static pressure needed for a given air flow. Looking at fans OTOH, the pdfs typically list the flow at a given backpressure. Sadly I'm not smart enough to relate the two. Could someone help me out with some formulas? Also, heres a PDF for reference. I'd love to try out these 12712752mm fans. The static pressure these things generate is simply amazing. Not to mention they're almost the exact size of a heatercore. http://www.nidec.com/fanpdfs/c2002_3939.pdf Thanks. Edit: Bad link.

12-14-2002, 02:34 AM	#2
Alchemy Cooling Savant Join Date: Oct 2002 Location: Boston Posts: 238	Try using Excel. Plot a pressure vs. flow line for the rad and another pressure vs. flow line for the fan. The point they intersect will give you the pressure drop and flow rate you'll see. Alchemy

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