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[EnergyPlus_Support] Re: CTF vs. CondFD results

Hi all,

Brent's comments seem to hold true.  The CondFD in V4.0 appears to be the source of my problem.  I ran 3 models for 4 cases: each of CTF and CondFD for v3.1 and v4.0.  Three of the four got values within 1% of each other.  The odd one out was consistently the CondFD in v4.0.

Brent, any idea when this might be resolved and whether a new version would be released before 6 months from now?

Thanks to all others for your advice.

Regards,
Liam O'Brien

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Liam" <liambrn@...> wrote:
>
> Hi All,
> 
> I'm modeling a building of fairly heavy mass so I want to use the CondFD algorithm to better characterize transient effects.  A comparison between CTF and CondFD yields differences in predicted heating loads of 100% or more.  
> 
> I repeated the comparison for several of the example files, e.g., 4ZoneWithShading_Simple_1 and got similar differences.
> 
> Everything in the models is identical except for HeatBalanceAlgorithm.  I used 20 time-steps/hour for both algorithms.
> 
> Any thoughts as to what might be happening?
> 
> Thanks in advance!
> 
> Liam O'Brien
>




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