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Re: [EnergyPlus_Support] 3 questions
On 13 May 2003, at 13:58, Anna Chow wrote:
> Hi, All,
> I have the following 2 questions:
> 1. To simulate a zone that all "envolope" walls are not exposed to
> exterio environment but interior environment (an air conditioned
> space), how to difined the surfaces:heat transfer? especially the
> following field:
> ExteriorEnvironment, !- OutsideFaceEnvironment
> , !- OutsideFaceEnvironment Object
> NoSun, !- Sun Exposure
> NoWind, !- Wind Exposure
To model as an adiabatic surface, assuming the adjacent space is at
the same or nearly the same conditions as the space you are modeling:
Surface_10, !- User Supplied Surface Name
WALL, !- Surface Type
PARTITION06, !- Construction Name of the Surface
EAST_ZONE, !- InsideFaceEnvironment
OtherZoneSurface, !- OutsideFaceEnvironment
Surface_10, !- OutsideFaceEnvironment Object (itself)
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
> How about the exposed space is kept at certain temperature, how to
> specify that effect?
Model another zone that is conditioned to the desired temperature, or
> 2. If the chilled water supply is done by 3 parralel pumps, the pumps
> start/stop depends on the load. How to model the plant loop? It seems
> that it only allow 1 mixer (or splitter) in each loop, but to model
> the parralel pumps, it has to allow more than one mixer(splitter) in
> the plant loop.
If I understand correctly what you are describing, you would need to
model this as a single variable-speed pump with a power curve that
approximates the stepped power consumption of the three pumps.
> 3. For a constant COP chiller, is there a way to schedule the chilled
> water outlet temperature, so that in the night it supply lower
> temperature water with lower COP, and in the day it supplys higher
> temeperature water with higher COP?
The constant COP chiller is very very simple and it's COP will be
constant no matter what the chilled water temperature is. If you
want a chiller that responds to chilled water temperature, then use
CHILLER:ELECTRIC, or use 2 different constant COP chillers, one
scheduled to run during certain times and the other scheduled to run
at other times. To control the chilled water outlet temperature, use
the Loop Temperature Setpoint Schedule on the PLANT LOOP object.
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