When a curve output exceeds the limits (min/max output, OUTPUT-MIN and OUTPUT-MAX keywords), eQUEST throws a CAUTION message in the SIM file, something like this:

**CAUTION**********************************************************************

In curve: Variable Speed Drive FPLR the dependent value

is exceeding the limits.

Value/Min/Max/First time: 1.004 0.100 1.000 7/21/ 8

I'm curious, what happens when the input type for a performance curve is "Raw Data Points" and during the course of the simulation one of the independent variables is outside the range of the raw data points? For example, here's a curve from the library (BDLLIB.DAT) that's defined via data points:

$LIBRARY-ENTRY SmFricW3VSD-EIR-fPLR&dT CURVE-FIT Sml Fric 3App -044d2 35

$ 70/140 ton, 3F approach evap & cond; R134a extended 460V 10F superheat -044d2 36

$ EIR = 0.182, 0.64 kW/ton, COP 5.5 -044d2 37

TYPE = BI-QUADRATIC-RATIO&DT INPUT-TYPE = DATA -044d2 38

IN-RATIO = ( 1.00, 0.75, 0.50, 0.25, $ PLR -044d2 39

1.00, 0.75, 0.50, 0.25, -044d2 40

1.00, 0.75, 0.50, 0.25, -044d2 41

1.00, 0.75, 0.50, 0.28 ) -044d2 42

IN-DT = ( 41.0, 41.0, 41.0, 41.0, $ ECT-CHW DT -044d2 43

31.0, 31.0, 31.0, 31.0, -044d2 44

26.0, 26.0, 26.0, 26.0, -044d2 45

46.0, 46.0, 46.0, 46.0 ) -044d2 46

OUTPUT = ( 1.00, 0.70, 0.46, 0.27, $ EIR ratio -044d2 47

1.00, 0.66, 0.39, 0.22, -044d2 48

1.00, 0.65, 0.38, 0.19, -044d2 49

1.00, 0.72, 0.50, 0.32 ) .. -044d2 50

In the data points, the minimum PLR boundary for the curve is 0.25 - what happens if during the simulation the PLR is 0.20? Does eQUEST use the curve output regardless (and is a CAUTION generated), or is the output at the minimum independent variable used?

Thanks,

Phil Jordan