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Re: [EnergyPlus_Support] Radiant Slab Outside Environment
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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