Calculates the heat radiation exchange between he parallel surface 1 and surface 2.
function HeatRadiationTwoParallelSurfaces extends BuildingSystems.HAM.HeatRadiation.BaseClasses.HeatRadiationTwoSurfaces; input Modelica.Units.SI.Emissivity epsilon1 "Long-wave emission coefficient of surface 1"; input Modelica.Units.SI.Emissivity epsilon2 "Long-wave emission coefficient of surface 2"; end HeatRadiationTwoParallelSurfaces;