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[EnergyPlus_Support] Water to Water Heat Pump Temperature Drops



I am modeling water to water heat pumps using the equation fit element. Unfortunately, I appear to be be deriving the coefficients incorrectly. 

After month of heating, the source side outlet of the heat pumps see temperature drops down to -500 degrees and below. 

Has anyone seen an response like this before? Does anyone have a calculator for me to double check my derived coefficients or what reasonable coefficients should look like? 

Thanks,



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