[EnergyPlus_Support] Re: SUMHAT -- More Explanation of variable.

[Linda Lawrie <linda@xxxxxxxxxx>]

 From one of the developers:

SUMHAT is an internal variable that is used during the calculation of the 
zone air heat balance.  It is calculated during the inside surface heat 
balances.  SUMHAT applies to a particular zone and is the sum of the 
product of h, A, and T for each surface.  h is the convection coefficient 
for a particular surface (this can vary with temperature difference, 
orientation, etc.).  A is the area for a particular surface.  T is the 
temperature of the surface (in Celsius).  Note that T is not the 
temperature difference between the surface and the zone air because 
EnergyPlus must solve for the zone air temperature.  So, for each zone, 
during the inside surface heat balance, E+ sums up hAT for each surface in 
that zone and stores this value in the variable SUMHAT.  The number 
reported is in Joules.


Linda

EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team




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