Hi everyone, How can I generate the coefficients for compressor performance curves (for a refrigerated warehouse model)?
Is there a tool that inputs manufacturer data and outputs the curve coefficients? such as the CurveFitTool.xlsm but generates Bicubic curves, because the CurveFitTool has only Cubic, Quadratic, and Bi-quadratic options.
Thank you.
I've discovered a convenient solution for this issue by utilizing manufacturer product selection tools. Certain manufacturers offer tools that allow you to input specific data conditions, helping you identify the suitable compressor. Additionally, these tools provide performance data in either tabular form or as bicubic polynomials. Currently, I make use of two free tools: Coolselector2 from DANFOSS (Fig.1) and BITZER Software from BITZER (Fig.2).
If you have access to performance tabular data, you can perform regression analysis using EXCEL, although it requires additional effort (Fig.3).
Fig.1 
Fig.2 
Fig.3 
It seems you answered your own question (the CurveFitTool.xlsm that comes with E+). Are you asking about how to use this tool? Or are you looking for sources of manufacturer data that can be input into the CurveFitTool?
Thank you so much for your answer! I greatly appreciated it. The compressor performance curves are Bicubic curves and the CurveFitTool.xlsm file only has Cubic, Quadratic, and Bi-quadratic options. So how do I use it to calculate the coefficient of a Bicubic curves to use it for compressorspower and capacity performance curves? And since you ask, where can I find the manufacturer's data and how to use the tool? Thank you very much.
Asked: 2023-02-02 10:40:05 -0500
Seen: 176 times
Last updated: Jan 28
Clarifying: Refrigeration compressors (such as for a refrigerated warehouse) require curves which are very different. If you are thinking about curves for DX cooling coils, CurveFitTool should be great.
Yes that right, I want to generate compressors bi-cubic curves for a refrigerated warehouse model.
I may be able to assist. Please contact me at: jvdirkes2@protonmail.com for more discussion.
Do you know about the curve data set available in EnergyPlus? If not, look for RefrigerationCompressorCurves.idf in the DataSets folder.
Thank you for your comments. Yes, I have been using the RefrigerationCompressorCurves.idf file, I want to know how the process is done to generate such curves so I can explain it if anyone asks.