RE: Re: [EnergyPlus_Support] radiant panels

Is it possible to place an internal source (e.g. a chilled ceiling) in a subsurface as a part of a ceiling?

I get an error when using Designbuilder, saying that the ceiling has no internal source

Geert Bellens

Van: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Namens jeannieboef@xxxxxxxxx
Verzonden: woensdag 27 november 2013 13:03
Aan: EnergyPlus_Support@xxxxxxxxxxxxxxx
Onderwerp: RE: Re: [EnergyPlus_Support] radiant panels

you are kind of reaching the limits of the simulation program here...I take it you want to know how to best model a chilled ceiling suspended from an active core cooled slab. There are a couple of options, with pros and cons.

1) create a seperate "plenumn" zone for the hanged ceiling space

2) create a zone internal surface, in which you can imbed the internal source.

Normally, I would opt for 1) in combination with an appropriate zoneairmixing object setup.

The cons of using 2) include:

- radiation exchange is only considered in one direction ("towards the zone" relative to facing direction)

- neglected internal dayligh ting considerations

- convection considerations (also only to one facing side)

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <a_tzoulis@...> wrote:

Ok but this is the way you add a heated floor or a chilled ceiling which is not exactly what I want to do.

In my model I have created a thermally activated layer in each slab and therefore it is not possible to add a second internal source in the same construction.

The radiant panel should be applied only at a part of the ceiling and it is not part of the slab. Is it possible to add a construction or a plenum only at a part of the ceiling? If this is possible I think that this can be modelled as a construction with a highly conductive material which radiates according to the water temperature it flows inside.

Regards,

Athinodoros Tzoulis

On Wednesday, November 27, 2013 2:00 AM, Jeremiah Crossett <jcrossett@...> wrote:

Yes, using construction internal source and a fluid loop. Check IO..

Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions

120 E. Pritchard St. | Asheboro, NC 27203

| Mobile 503-688-8951

www.phasechange.com

On Tue, Nov 26, 2013 at 4:51 PM, Athinodoros Tzoulis <a_tzoulis@...> wrote:

Hi,

Is there a way to model radiant panels (panels in which cold and hot water flows) as a cooling and heating equipment in EnergyPlus with their properties (tubing distance, inner tube diameter, etc.)?

Thank you in advance

Best regards,
Athinodoros Tzoulis

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