Calculates the pressure drop in a radiator according to manufacturer data
The pressure drop is calculated according to the following equation [1].

In order to determine K, manufacturer data is used and :

With the help of the Matlab Curve Fit Toolbox a curve y = K*x^2 is fitted through several selected points.
[1] Ross, Hans: "Hydraulik der Wasserheizung", Oldenbourg Industrieverlag GmbH, 2002.