Fraction of Hour Chiller Operates calculation

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I am trying to sift through how eQuest calculates a chiller's end
electrical usage and I am stuck on the fraction of hour the chiller
operates.
The DOE-2 engineers manual says it is calculated as follows:

FRAC = PL / RMIN,

where PL is the average part load ratio over the hour, calculated as:

PL = ALOAD / CAP,

where ALOAD is the assigned hourly load and CAP is the corrected
operating capacity.

RMIN is the part load ratio of rated load at which the chiller can
operate continuously.

I have used some of the calculated values in the hourly report and
cannot verify how eQuest is calculating this FRAC amount.

Does anyone have some insight?

Thanks,

Aaron Etzkorn, EIT

Aaron.Etzkorn at tac.com's picture
Joined: 2011-09-30
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