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Re: [EnergyPlus_Support] Basic query regarding energy balance in uncontrolled zone simulation



Hi,
Thanks for replying! 

Yeah, my bad in typing. Apologies.

I tried to compare these two variables -- 

Surface Inside Face Convection Heat Gain Rate  summed over all surfaces and 
Zone Air Heat Balance Surface Convection Rate

They still don't match. 

Any idea why?

Thanks! 





On Mon, Aug 12, 2013 at 8:25 PM, Richard Raustad <RRaustad@xxxxxxxxxxxx> wrote:
 

I don't see a report variable for Zone Air Heat Balance Surface Convection Energy.

Did you try comparing these report variables:

Surface Inside Face Convection Heat Gain Rate
Zone Air Heat Balance Surface Convection Rate




On 8/12/2013 10:23 AM, Maathangi Sankar wrote:
Hello everyone! 
I have a problem trying to get an energy balance with the convection heat transfer terms.
I am trying to do a single zone unconditioned simulation (no hvac system, essentially uncontrolled zone).

I am getting the following outputs :- 
Surface Inside Face Convection Heat Gain Energy for all surfaces (6)
Zone Air Heat Balance Surface Convection Energy

If I add up all the terms contributing to the Surface Inside Face Convection Heat Gain Energy, I should get Zone Air Heat Balance Surface Convection Energy. But, they don't match.

However, if I do include an ideal loads air system (purchased air), the above equation is satisfied, the sum of all the components due to surface to zone air convection adds up to the zone air heat balance surface convection. 

I thought, that the uncontrolled zone case was a very simplified version of the case with the hvac system, and expected to see the energy balance clearly. But, that doesn't seem to happen.

Is there a reason why this doesn't match in the case of uncontrolled zone simulation? Or Am I doing something wrong? 

Any help in understanding and deciphering what is going on here would be greatly appreciated! 

Thank you very much! 



-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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