[Equest-users] VSD fans at part load
Christina.Galyfianaki at hurleypalmerflatt.com
Wed Jun 4 08:59:16 PDT 2008
Dear eQuest users,
I am trying to model Variable Speed Drive Fans. The EIR (Electric Input
Ratio) as a function of PLR (Part Load Ratio) can be defined as a
quadratic performance curve with the help of Row Data Points given by
The fans are designed to work at part-load of 0.75 or less because this
way they are more energy efficient, i.e. the supply electrical power
intensity kW/cfm is lower.
What would the Design kW/cfm be in this case? I am thinking of using the
power intensity that is given at 0.75 Load Ratio as in the actual system
this will be my pick conditions. But I am not feeling very confident
Should the Design cfm of the supply flow be defined or calculated by the
program? In the case of it being defined what would be the input value:
the air flow of the 0.75 part load (at pick conditions) or the 1.00 full
load ratio that is never applied.
Any help will be appreciated. Thanks in advance,
Building Physics Division
West End Office
d: +44(0) 20 7535 3106
t: +44(0) 20 7535 3100
f: +44(0) 20 7535 3101
e: christina.galyfianaki at hurleypalmerflatt.com
w: www.hurleypalmerflatt.com <http://www.hurleypalmerflatt.com>
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