[bldg-sim] Calculating chiller EIR in eQUEST

[Keir Howell]

The eQUEST documentation states that the chiller electric use is calculated
as follows:



Elec(in) = EIR x EIR f(PLR) x EIR f(t1,t2) x Capacity x Capacity f(t1,t2)



However, I have never been able to recreate the hourly values that I get
from eQUEST.  I created an hourly report that shows Corrected EIR, PLR,
CHWT, ECT, Capacity at Current Conditions, EIR Temp Correction Factor, EIR
PLR Correction Factor and Load.  I can recreate the 2 EIR correction factors
from the curve data, but when I multiply by the design EIR, I do not get the
Corrected EIR. When I multiply either the Corrected EIR or my calculated EIR
by the other variables per the equation above I get a different value for
the Electric input. Also, dividing the Load by the Capacity does not give me
the same PLR. Am I missing something?



Thanks,



Keir Howell
Bluestone Energy Services, Inc.
phone:    781-356-8865
fax:    781-356-8864



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