.TAeZoSysPro.HeatTransfer.Functions.FreeConvection.ground_ASHRAE

Information

The following Lloyd and Moran correlation is applicable for an horizontal plate in rest environment (no forced convection) where the fluid is above the wall.
The formula is picked from the ASHRAE guide chapter 3 table 10 equation T10.5 to T10.9

The correlation is given for a Rayleigh number:

• 10⁵ < Ra < 10¹⁰ for a upward-facing cooled plate (if dT < 0)
• 1 < Ra < 10⁹ for a upward-facing heated plate (if dT > 0)

Where :

• Nu is the Nusselt number
• Ra is the Rayleigh number

Interface

function ground_ASHRAE
  extends Modelica.Icons.Function;
  input Modelica.SIunits.TemperatureDifference dT;
  input Modelica.SIunits.RayleighNumber Ra;
  output Modelica.SIunits.NusseltNumber Nu;
end ground_ASHRAE;