All,

I'm modeling a building with water cooled self-contained units (one per floor). These units contain up to five single speed compressors. As system loads the individual compressors stage on and off. I do not know how to fit the performance curve. Step functions are not one of the options for curve fit. Does anyone have any ideas? And exactly which performance curve would I need to modify. I'm assuming the temperature and flow curves would stay the same and only the part load curve would need to change.

Thanks,
D