.BuildingSystems.Technologies.DistrictHeatingNetworks.UndergroundPipes.BaseClasses.DHN_Umodels.UPrescribed .BuildingSystems.Technologies.DistrictHeatingNetworks.UndergroundPipes.BaseClasses.DHN_Umodels.UPrescribedValues for U1 and U2 are defined by
the parameters U1_constant and
U2_constant respectively.