The equation we use to calculate the Vorlauftemperatur is a standard ansatz used for heat pumps:
TVor = Traum + α η (Traum - Tout)x
where TVor=Vorlauftemperature, Traum=Raum-Solltemperatur, Tout=AußenTemperatur,
and η = neigung. The parameters α and x depend on the particular heat pump used. Note: we have chosen
the offset N=0. For our Vießmann heat pump we use α=1.83 and x=0.83, which agrees fairly well with
the graph below.
