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[EnergyPlus_Support] Re: Creating a Shadowing Transmittance Schedule for a overhang





Thanx for your answer!

This is the code I entered so far:

  EnergyManagementSystem:Sensor,
    BinnenTemperatuur,       !- Name
    ZONE ONE,                !- Output:Variable or Output:Meter Index Key Name
    Zone Mean Air Temperature;  !- Output:Variable or Output:Meter Name

  EnergyManagementSystem:Sensor,
    ZonneStraling,           !- Name
    ZONE ONE,                !- Output:Variable or Output:Meter Index Key Name
    Direct Solar;            !- Output:Variable or Output:Meter Name


  Schedule:Constant,
    ZonneweringSchema,
    Fraction,
    1.0;

  EnergyManagementSystem:Actuator,
    ZonneweringSchemaOverride,           !- Name
    ZonneweringSchema,             !- Actuated Component Unique Name
    Schedule:Constant,       !- Actuated Component Type
    Schedule Value;          !- Actuated Component Control Type

  EnergyManagementSystem:ProgramCallingManager,
    ZonneweringSchemaControle,      !- Name
    BeginTimestepBeforePredictor,   !- EnergyPlus Model Calling Point
    ZonneweringBediening;           !- Program Name 1

  EnergyManagementSystem:Program,
    ZonneweringBediening,                                     !- Name
    IF (BinnenTemperatuur >=21) && (ZonneStraling >=100),     !- <none>
    SET ZonneweringSchemaOverride = 0.0,                      !- <none>
    ELSE,
    SET ZonneweringSchemaOverride = 1.0,
    ENDIF;                                                    !- <none>

  Output:Variable,
    ZonneweringSchema,
    Schedule Value,
    timestep;

And my shadings:

!-   ===========  ALL OBJECTS IN CLASS: SHADING:ZONE:DETAILED ===========

Shading:Zone:Detailed,
    Zn001:Wall-East:Shade001,!- Name
    Zn001:Wall-East,         !- Base Surface Name
ZonneweringSchema,           !- Shadowing Transmittance Schedule
           4, !-RectangularOverhang
7.5,-1.8,2.25,
8,-1.8,2.25,
8,1.8,2.25,
7.5,1.8,2.25;



Shading:Zone:Detailed,
    Zn001:Wall-South:Shade001,  !- Name
    Zn001:Wall-South,        !- Base Surface Name
ZonneweringSchema,           !- Shadowing Transmittance Schedule
           4, !-RectangularOverhang
-5.625,-4.5,2.505,
-5.625,-5.5,2.505,
5.625,-5.5,2.505,
5.625,-4.5,2.505;



Shading:Zone:Detailed,
    Zn001:Wall-West:Shade001,!- Name
    Zn001:Wall-West,         !- Base Surface Name
ZonneweringSchema,           !- Shadowing Transmittance Schedule
           4, !-RectangularOverhang
-7.5,1.8,2.25,
-8,1.8,2.25,
-8,-1.8,2.25,
-7.5,-1.8,2.25;



The output variabel ZonneweringSchema gives the correct values per hour: between 0.0 and 1.0
So i guess the function works well.
Only the shades itselfs dont use the EMS program, rather de schedule only:
  Schedule:Constant,
    ZonneweringSchema,
    Fraction,
    1.0;
So the shades are transparant always, they dont influence the inside temperature, and they should!
Thats also what the error message said:
** Warning ** Shading:Zone:Detailed="ZN001:WALL-EAST:SHADE001", Transmittance Schedule Name="ZONNEWERINGSCHEMA", is always transparent.
   ** Warning ** Shading:Zone:Detailed="ZN001:WALL-SOUTH:SHADE001", Transmittance Schedule Name="ZONNEWERINGSCHEMA", is always transparent.
   ** Warning ** Shading:Zone:Detailed="ZN001:WALL-WEST:SHADE001", Transmittance Schedule Name="ZONNEWERINGSCHEMA", is always transparent.


What am I doing wrong?
I cant find the problem.

Greetings

Pieter



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> Since you will need to set the schedule (0 is
> opaque, 1 is transparent) dependent on other
> conditions, you will need to use the EMS feature
> (see example file EMSCustomSchedule).
>
> As to the schedule -- it's just like any other schedule.
>
>
> At 08:26 AM 8/8/2011, pietsor wrote:
> >Hi everyone!
> >
> >I have a small problem.
> >I am simulating a building with a shading overhang above a window.
> >I want this overhang not to be fixed but opening
> >and closing depending on BOTH INSIDE TEMPERATURE (21°C) and EXT SOLAR INCIDENT.
> >
> >So what I want is that the overhang closes with
> >Inside Temperature passing 21°C AND Solar
> >Incident above certain value (that I dont know yet).
> >
> >In the manual of EnergyPlus i read that i can
> >use a Shadowing Transmittance Schedule in my Shading zone Object.
> >
> >I just dont know how to make this shedule, as
> >normal schedules are varying with time, not with
> >values of Temperature and Solar Incident.
> >I know the output value of this schedule needs
> >to be between 0.0 and 1.0 (transmittance of the
> >overhang) depending the other values, but how do enter them?
> >
> >Can anyone help me with the code for this shedule?
> >
> >You would make me very happy :)
> >
> >Greeting from Belgium
> >
> >Pieter
> >
> >
> >
> >------------------------------------
> >
> >Primary EnergyPlus support is found at:
> >http://energyplus.helpserve.com or send a
> >message to energyplus-support@...
> >
> >The primary EnergyPlus web site is found at:
> >http://www.energyplus.gov
> >
> >The group web site is:
> >http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> >Attachments are currently allowed but be mindful
> >that not everyone has a high speed
> >connection. Limit attachments to small files.
> >
> >EnergyPlus Documentation is searchable. Open
> >EPlusMainMenu.pdf under the Documentation link and press the "search" button.
> >Yahoo! Groups Links
> >
> >
> >
>


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Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.




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