RE: [EnergyPlus_Support] About exterior surface convection coefficient algorithms in EP

["Griffith, Brent" <brent.griffith@xxxxxxxx>]

I don’t know TAS and IES but is sounds like they are old fashioned models whose “convection coefficient” actually combines convection and thermal radiation into a single coefficient.  That is what E+’s “simple” model does. 

 

Combining convection and radiation into a single coefficient is a simplification that many older/simpler programs make to model heat flows.  But it is a poor approach when calculating surface temperatures.  

 

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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of hvacgeshen516
Sent: Tuesday, June 02, 2009 12:57 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] About exterior surface convection coefficient algorithms in EP

 

If the algorithms except simple are chosen, the wind-driven convection coefficient will be much smaller than algorithms implemented by other software like TAS or IES.

Is there any comments on this?

Thanks and Regards
Xiangjing =)

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