# How to build current blower fan model in Flotherm

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 January 26, 2015, 03:49 How to build current blower fan model in Flotherm #1 New Member   Eric Lin Join Date: Jun 2013 Posts: 1 Rep Power: 0 Method 1:Build fan housing geometry and create one fan (smart part) at fan outlet fan construction:rectangular fan and dedine non-linear fan curve Method 2:Build fan housing geometry and create two fan (smart part) at fan inlet(top&buttom) fan construction:Axial fan and dedine non-linear fan curve Method 3:Build fan housing geometry and create recirculation devices fan construction one supply and two extract Question 1:Which way is best method for blower fan? Question 2:About P-Q curve, Why the fan outlet flow rate can't meet P-Q SPEC? such as SPEC Qmax=15 CFM, but fan outlet flow rate just only 12 CFM Question 3:When I use method 2, How do I define P-Q curve value for two fan? shuisheng likes this.

 January 27, 2015, 02:06 #2 Member   Gabriel Ciobanu Join Date: Jul 2011 Posts: 47 Rep Power: 14 hello, this might be useful: http://webparts.mentor.com/flotherm/...arts/v6blower/ somehow it tells you to use "method 3" Best regards, Gabriel

 November 24, 2020, 09:20 #3 New Member   Nam Shaheb Join Date: Nov 2020 Posts: 3 Rep Power: 5 Have you found the solution to your problem? I am also looking for help in this.

 January 2, 2021, 02:36 #4 New Member   Hank Chung Join Date: Oct 2016 Posts: 5 Rep Power: 9 Personally I prefer the method 3. Both model 1 and 2 will calculate the pressure drop of the fan geometry, that is why the outlet flow rate is lower than P-Q curve. For model 3, you can define the P-Q same as the original one because recirculation device does not consider the geometry and pressure loss.

 Tags blower, fan, recirculation