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Optimum Part Load Ratio

Chiller and Boiler objects such as Chiller:Electric:EIR have a Field: Optimum Part Load Ratio. What is this for? I tried changing the ratio, but the simulation result didn't change at all, which makes sense as chiller/boiler performance is defined by performance curves. This is an unnecessary field, isn't it?

Optimum Part Load Ratio

Chiller and Boiler objects such as Chiller:Electric:EIR have a Field: Optimum Part Load Ratio. What is this for? I tried changing the ratio, but the simulation result didn't change at all, which makes sense as chiller/boiler performance is defined by performance curves. This is an unnecessary field, isn't it?