About Element Get Parameter By Value (Revit pipe sizing)

I am trying to pipe sizing method (with watt not l/s) than I added ΔT,specific heat shared parameter in piping system. My purpose is enter ΔT value and other parameters value than formula with pipe flow(q=mcΔT) than get ΔT, specific heat etc.parameters in piping system. First I need connect below picture but I cant.