.TAeZoSysPro.HeatTransfer.Functions.FreeConvection.ceiling_ASHRAE

Information

The following bLloyd and Moran correlation is applicable for an horizontal plate in rest environment (no forced convection) where the fluid is bellow 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 Downward-facing heated plate
• 1 < Ra < 10⁹ for a Downward-facing cooled plate

Where :

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

Interface

function ceiling_ASHRAE
  extends Modelica.Icons.Function;
  input Modelica.SIunits.TemperatureDifference dT "Temperature difference plate - fluid";
  input Modelica.SIunits.RayleighNumber Ra;
  output Modelica.SIunits.NusseltNumber Nu;
end ceiling_ASHRAE;