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Re: [EnergyPlus_Support] Radiant Slab Outside Environment
1. Yes.
2. You can ignore the error message.
3. If you have both and air system and a radiant system, then the air system
will control to MAT if it is able.
Mike
On 23 Aug 2004, at 12:37, zhen tian wrote:
> Hi, Mike
>
> Thanks for your reply.
>
> I still have some question for this problem.
>
> First, from your method, the zone with radiant slab on the ceiling and floor is
> treated as a "middle zone", as discribed in the "InputOutput Reference", is it
> right?
>
> Second, according to your method, I got a severe error from the error report
> but I can got the simulation result. The error report is:
>
> "Severe ** CAUTION -- Interzone surfaces are usually in different zones
> ** ~~~ ** Surface=OBJ:0147, Zone=3_P_W
> ** ~~~ ** Surface=OBJ:0150, Zone=3_P_W"
> Object 147 is the zone floor and Object 150 is the zone ceiling. I set the
> outside environment of Object 147 as Object 150 using the "Other Zone Surface"
> option. And the outside environment of Object 150 as Object 147.
>
> So what is wrong for this setting? Or can I omit this error?
>
> The third quesiton is more complex. The zone imulated is a internal zone (no
> surface contacts outside environment) and thermostat setpoint is 22 degree C.
> But no matter I use MRT, MAT or Operative. The zone air temperature is around
> 22 degree C, while the MRT varies. From my field measurement data, the indoor
> air temperature changes too. Sounds like Energyplus still take Air Temperature
> as the setpoint. Otherwise the air temperature will vary if I use MRT or
> Operative as the temperature control type. If my guess is right? The zone is
> controlled by air system too (with very low air flow rate to let the radiant
> system run).
>
> Thank you very much for your help.
>
> Best regards,
>
> Zhen
>
>
>
>
>
>
> "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> When the outside environment is set to OtherZoneSurface, EnergyPlus forces the
> outside surface temperature to equal the inside surface temperature of the
> specified OtherZoneSurface. Making the surface containing the cooling system
> adiabatic will only be valid if the construction of that surface is symmetrical
> and the cooling source is in the center of the construction.
>
> Is there a radiant cooling slab in between all of the floors? If so, you can
> set the exterior environment of the 2nd level floor to be the 2nd level ceiling,
> and set the exterior enviorment of the 2nd level ceiling to be the 2nd level
> floor. This creates a situation where two surfaces in the same zone are
> connected as interzone surfaces. If the situation truly repeats itself, this
> can be a valid approach.
>
> Mike
>
>
> On 19 Aug 2004, at 12:15, zhen tian wrote:
>
> > Hi:
> >
> > I am simulating a multi-floor building with radiant slab cooling system. The
> > radiant floor is between two floors. But I only want to simulate one floor.
> > For example, the radiant slab is between 2 and 3 floor. I only want to
> > simlate the 2th floor. So how can simulate the 2th floor without simulating
> > the 3rd floor? Since the radiant floor will have effect on the 3rd floor and
> > the 3rd fllor is conditioned too. Can I define the foor as adiabatic surface?
> > Or how can I define the outside environment for the slab surface?
> >
> > Thanks a lot.
> >
> > Regards,
> >
> > Zhen
> >
> >
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>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
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