Re: [EnergyPlus_Support] CTF vs. CFD Radiant

Jeremiah D. Crossett

CleanTech Analytics

503-688-8951

www.cleantechanalytics.com

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On Wed, Jun 13, 2012 at 6:04 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

Lots of changes were done/fixed in the V7.1 release for CFD.

First, I suggest you upgrade to V7.1

On 2012-06-13 18:58, jcsippel@xxxxxxxxx wrote:
> Hello,
>
> I am attempting to do an analysis of hydronically charged PCM and
> have two questions.
>
> The first is in the set up of my base radiant system. I have seen
> some posts in regard to the issue of ConductionTransferFuctions vs.
> ConductiveFiniteDifference algorithms but am hoping someone will be
> able to help clarify the issue with v7 and the application of radiant
> systems. I seem to have my base radiant system up and running fairly
> well but once I switch to a CFD algorithm in prep for adding PCM I am
> getting drastically different result compared to the CTF, primarily
> during summer cooling. I am having difficulty determining if this is
> a user error and needs further adjustment or if I am working against
> the program.
>
> My second question is in regard to the PCM. Again my study is trying
> to charge PCM in the walls and roof (Phoenix Cooling) to shift loads.
> My research is leading me to believe that E+ is not yet able to
> tackle
> this issue, "Modeling a radiant floor system with Phase Change
> Material (PCM) integrated
> into a building simulation tool: Analysis of a case study of a floor
> heating
> system coupled to a heat pump" which is dated fairly recent but again
> I am hoping someone has insight to confirm that this is not yet
> directly achievable in E+ or maybe direct me to a work around. I
> have
> found research suggesting TRANSYS aided in a PCM cooling panel study
> but after investing time into learning E+, switching programs won't
> be
> feasible for my timeline to switch.
>
> I appreciate your time and suggestions,
>
> Jason
>
>
>
> ------------------------------------

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Re: [EnergyPlus_Support] CTF vs. CFD Radiant - (PCM Compatable?)