[TRNSYS-users] Variable Fan Power Coefficient

[Nidal Abdalla]

Dear LEE
 Law 1. With impeller diameter (D) held constant:
Law 1a. Flow is proportional to shaft speed: 
Law 1b. Pressure or Head is proportional to the square of shaft speed:
Law 1c. Power is proportional to the cube of shaft speed:
Law 2. With shaft speed (N) held constant:
Law 2a. Flow is proportional to impeller diameter:
Law 2b. Pressure or Head is proportional to the square of impeller diameter:
Law 2c. Power is proportional to the cube of impeller diameter:
where
	*  is the volumetric flow rate (e.g. CFM, GPM or L/s),
	*  is the impeller diameter (e.g. in or mm),
	*  is the shaft rotational speed (e.g. rpm),
	*  is the pressure or head developed by the fan/pump (e.g. ft or m), and
	*  is the shaft power (e.g. W).
 
Regards
 
Nidal Abdalla
 

________________________________
 From: hankiat lee <leehankiat at hotmail.com>
To: trnsys-users at cae.wisc.edu 
Sent: Monday, March 5, 2012 8:34 AM
Subject: [TRNSYS-users] Variable Fan Power Coefficient
  

 

Hi all,

Do anybody know how to set the number of power coefficient and the values for each of the power coefficient in type 662, variable fan.

Thank You

Lee Han Kiat
 
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