Re: [EnergyPlus_Support] Heat Convection for building surface

["Michael J. Witte" <mjwitte@xxxxxxxx>]

By definition, the convection coefficient accounts for all of the 
heat transfer effects in the boundary layer near the wall surface.  
EnergyPlus uses two sets of correlations to adjust convection 
coefficients according to surface roughness, wind speed, and 
temperature difference.  These correlations, published by ASHRAE, 
have been determined through various research projects over the 
years.  For most applications, the convection coefficients are 
generally accepted within the heat transfer community as good 
approximations for the total heat transfer.  Note that the radiant 
transfer from surfaces is handled separately in EnergyPlus and is not 
combined into the convection coefficient.

Mike Witte



On 8 Aug 2002, at 2:15, rmp4aup6 wrote:

> Dear everybody:
> 
> We can easily get the Surface EXT Convection Coeff from the output of
> energyplus.
> 
> And we can easily calculate the Q of heat convection using 
> the formula of Q=hcA(ts-tf) where hc=the coeff of convection
> A= the area of surface, ts=temp of surface and tf= tmep of air
> But this is from the viewpoint of theoretical thinking. I am not sure
> the calculation result will be the same as the actual situation.
> 
> Besides HVAC system, I wonder E+ can calculate total heat release form
> the building itself.
> Thank you very much.
> 
> HSIEH Chun-Ming
> 
> 
> 
> 
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> 
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