Question-and-Answer Resource for the Building Energy Modeling Community
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You can't directly use water temp in the performance curve unless the Chiller:Electric:ReformulatedEIR is used. But you could override the curve result and thereby allow any form of performance curve calculation using the Energy Management System (EMS). See EMSCurveOverride_PackagedTerminalHeatPump.idf example file as a template for how to do this.
