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I used variable speed fan in my air loop for energy savings but the power consumption was not reduced. How to give correct coefficients for my model? Thanks in advance

I used variable volume fan for single zone and the coefficients are C1=0.040759893999999998, c2=0.08804497, c3=-0.072926119999999997, c4=0.94373982300000003, c5=0, the fan pressure was 995 Pa and the flow rate was autosized.

I used variable speed fan in my air loop for energy savings but the power consumption was not reduced. How to give correct coefficients for my model? Thanks in advance

I used variable volume fan for single zone and the coefficients are C1=0.040759893999999998, c2=0.08804497, c3=-0.072926119999999997, c4=0.94373982300000003, c5=0, the fan pressure was 995 Pa and the flow rate was autosized.