Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The reference conditions identify the rating point used to normalized the performance curves. If you enter the reference conditions into the performance curve equation, the result should be equal to or very near 1.
The chiller reference conditions for Chiller:Electric:EIR are only used to test the performance curves to see if they result in a value of 1 +/-10%. for this specific chiller, changing the reference conditions will not change the model, except that you may see warnings stating that the performance curve does not evaluate to 1 at the reference conditions (if you change the reference conditions sufficiently).
The chiller reference conditions for Chiller:Electric:ReformulatedEIR are also used to test the performance curves but more importantly are used within the model to calculate lift when Electric Input to Cooling Output Ratio Function of Part Load Ratio Curve Type =Lift. Changing the reference conditions in this case will change the results.
What you should keep in mind is that the reference conditions define the performance curve normalization point and should only be changed if the performance curves are also re-normalized to this point. The chiller rated nominal capacity is based on these reference points or on the Sizing:Plant inputs if different from the reference point.
| | 2 | No.2 Revision |
The reference conditions identify the rating point used to normalized the performance curves. If you enter the reference conditions into the performance curve equation, the result should be equal to or very near 1.
The chiller reference conditions for Chiller:Electric:EIR are only used to test the performance curves to see if they result in a value of 1 +/-10%. for For this specific chiller, changing the reference conditions will not change the model, except that you may see warnings stating that the performance curve does not evaluate to 1 at the reference conditions (if you change the reference conditions sufficiently).
The chiller reference conditions for Chiller:Electric:ReformulatedEIR are also used to test the performance curves but more importantly are used within the model to calculate lift when Electric Input to Cooling Output Ratio Function of Part Load Ratio Curve Type =Lift. Changing the reference conditions in this case will change the results.
What you should keep in mind is that the reference conditions define the performance curve normalization point and should only be changed if the performance curves are also re-normalized to this point. The chiller rated nominal capacity is based on these reference points or on the Sizing:Plant inputs if different from the reference point.
| | 3 | No.3 Revision |
The reference conditions identify the rating point used to normalized the performance curves. If you enter the reference conditions into the performance curve equation, the result should be equal to or very near 1.
The chiller reference conditions for Chiller:Electric:EIR are only used to test the performance curves to see if they result in a value of 1 +/-10%. For this specific chiller, changing the reference conditions will not change the model, except that you may see warnings stating that the performance curve does not evaluate to 1 at the reference conditions (if you change the reference conditions sufficiently).
The chiller reference conditions for Chiller:Electric:ReformulatedEIR are also used to test the performance curves but more importantly are used within the model to calculate lift when Electric Input to Cooling Output Ratio Function of Part Load Ratio Curve Type =Lift. = Lift. Changing the reference conditions in this case will change the results.
What you should keep in mind is that the reference conditions define the performance curve normalization point and should only be changed if the performance curves are also re-normalized to this point. The chiller rated nominal capacity is based on these reference points or on the Sizing:Plant inputs if different from the reference point.
