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First you must use the detailed HVAC mode. Construct the HVAC system as per your case and then edit the Chiller Data.

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Enter your chiller cooling capacity, COP etc. and then edit the performance curves based on your calculations. image description

You can find more information on the DesignBuilder Help: https://www.designbuilder.co.uk/helpv4.2/Content/ChillerEIR.htm