[esp-r] Re: Time steps and embedded heating cooling within a construction.

[Jon Hand]

There has been recent work on a system component and control which allows
for pipes to be embedded in a construction layer - this is normally used for
heating - it might also work for a chilled fluid.  I believe there are a few ESP-r
users who have explored this.  I would certainly like to arrange for a good
example model for structural slab heating as well as for thin radiant panels.

Perhaps someone in the community could offer some suggestions?  Can
the embedded pipe work with a thin highly conductive construction?

If we can sort a system component then short timestep for the building
would not be required.  

Enabling a sub-minute timestep would require changes in the source code
and data structures within the results analysis application.  Also testing.

-Jon Hand 
________________________________________
From: wakana-m at ec.hokudai.ac.jp [wakana-m at ec.hokudai.ac.jp]
Sent: 06 December 2012 02:27
To: Jon Hand; esp-r at lists.strath.ac.uk
Subject: Re: [esp-r] Re: Time steps

Dear Jon Hand,

Thank you always for your help.

I study about ceiling radiation cooling system.
My model includes a radiation panel which is very thin and the panel is
controlled.
I'd like to flow water in the panel zone.
I couldn't make water flow network, then I changed the convection
coefficient.
Now the convection coefficient of panel is equivalent of water.
The results aren't sometimes calculated.
I think the reason of the error is that the calculation diverged.
Therefore I tried to shorten time-steps.
If there are other good ways, please let me know.

If I try to simulate on a second basis, what should I change?
In simulator, there is "time-step controllers".
Is this related to time-steps?

Best Regards,

Wakana Matsumoto

----- Original Message -----
>
> The building part of the simulation is currently limited to a one
minute frequency.  If
> the model includes system components the system side can be assessed
at  a higher
> frequency up to ~1 second.  We normally assume that the building is
not so sensitive
> to time below a minute but the system components and electrical
components might
> change state more frequently.
>
> What (object) are you attempting to simulate where sub-minute
timesteps are needed?
>
> -Jon Hand
> ________________________________________
> From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.
uk] On Behalf Of wakana-m at ec.hokudai.ac.jp [wakana-m at ec.hokudai.ac.jp]
> Sent: 05 December 2012 09:11
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r]  Time steps
>
> Dear all,
>
>  Hello.
>  I'm a graduate student in Japan.
>  I want to know how to simulate on a second basis.
>
>  Until now, I've simulated on a minute basis.
>  I've input "60/1" in the initiate simulation window.
>  Now I try to simulate on a second basis.
>  However the input value for 'time-steps/hour' should be less than 60.
>  Thus, how can I do if I want to simulate the model by seconds ?
>
>  Any advice would be appreciated.
>
>  Regards,
>
>  Wakana Matsumoto
>
>
>
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