[Equest-users] creating performance curves

Nathan Miller nathanm at rushingco.com
Wed Oct 31 13:53:11 PDT 2012

This always gets confusing but I believe the curve labeled as EIR-fPLR is
not actually EIR as a function of part-load-ratio. 


I believe it is input ratio (operating kW as a ratio of full load kW) as a
function of part load ratio, so you have to set up your custom curves
based on those parameters. The input ratio value should be 1 at the 100%


Nathan Miller, PE, LEED AP BD+C

Mechanical Engineer/Senior Energy Analyst


D 206-788-4577 | O 206-285-7100

 <http://www.rushingco.com/> www.rushingco.com


From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Behnam
Sent: Wednesday, October 31, 2012 1:21 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] creating performance curves


Hi guys,


I'm trying to create chiller part load EIR curves based on manufacturer
data. I have part load (25%, 50%, 75%, 100%) as the independent variables
(X), and part load EIRs as the dependent variable (Z). The part load EIRs
from manufacturer are much better than what I get when I use default
EQUEST curve. But when I run the model and compare with same model with
default curve, my chiller electrical energy consumption is increased
significantly (with the manufacturer data). Has anyone been able to
successfully create performance curves, or does anyone know of any
documentation that might explain how to properly create these curves? Any
help is greatly appreciated.










Behnam Jowkar, MASc
Energy Services Associate


Fluent Group Consulting Engineers Inc.

295A Broadway Avenue, Second Floor

P.O. Box 188, Orangeville, Ontario, L9W 2Z6

t 888.358.3683 x704  f 866.620.7502  c 519.938.7657




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