Hello.
First, could it be that you ventilation air witch, usualy is treted is suficient to overcome your Load?
Second is it a variable or constante flow system, you used the direct duct object, is your fan constante volume?
Have you tried to setpoint the air tempreture about 1ºC colder than your space, if everything else is OK the radiant system has to be activated.
Best Regards
MN
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "O. Tugrul Karaguzel" <tugrulkaraguzel@...> wrote:
>
> Hi there,
> In my model zone ventilation is supplied by AHU as well as load function. I also realized that ventilation should be separated from air conditioning so as to couple radiant system. Can it be done by changing parameters of the heating coil of the central system since there should be some sort of pre-heating of outdoor air to be used for ventilation purposes?
> Best.
>
> Omer T. Karaguzel PhD Candidate
>
> Center for Building Performance & Diagnostics (CBPD)
>
> Carnegie Mellon University
> Ã? Pittsburgh, PA 15213
>
> --- On Mon, 7/5/10, MÃ?Æ?Ã?¡rio <mneves32@...> wrote:
>
> From: MÃ?Æ?Ã?¡rio <mneves32@...>
> Subject: [EnergyPlus_Support] Re: Low Temperature Radiant System
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Date: Monday, July 5, 2010, 5:04 PM
>
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> Ã?
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> Hello
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>
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> What is the AHU set for, load or ventilation functions?
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>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "O. Tugrul Karaguzel" <tugrulkaraguzel@> wrote:
>
> >
>
> > Hi,
>
> > In my Energy Plus model, I have a low temp (hydronic) radiant system and a single duct uncontrolled air terminal (connected to an AHU with a heating & cooling coil) serving the same thermal zone. I want the radiant system to be the main heating component and any remaining zone loads to be met by the other equipment. So as to do this, I already defined heating priority # 1 to radiant heating system and # 2 to single duct air terminal. However, my simulation results show that radiant system is not operating at all and all the zone loads are still met by air terminal units. How can I reverse this operation? Is there any other settings that can successfully couple these two systems?
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> > Thanks in Advance.
>
> >
>
> > Omer T. Karaguzel PhD Candidate
>
> > Center for Building Performance & Diagnostics (CBPD)
>
> > Carnegie Mellon University
>
> > Pittsburgh, PA 15213
>
> >
>