[EnergyPlus_Support] Re: How do I override a temperature sensor?

["hnoboam" <homero.noboa@xxxxxxxxx>]

Super help! Right on the target!
I needed to simulate a faulty OAT sensor and with your advise I found the actuator I needed to interact with.
Thanks again.
Homero.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent"  wrote:
>
> It depends what you want to use if for.  If it is for an HVAC outdoor air inlet node (like a rooftop package) then you can apply it directly to the "Outdoor Air System Node" actuator.  If you want to actuate the weather data for the entire model, then you'd need a separate, clean signal for the sensor since the actuator will step on it.  For a clean signal, I would make a Schedule:File generated from a previous run by reporting the value.  Then the EMS sensor goes on "Schedule Value."
> 
> For this kind of prescribed change to weather, another way to go with no EMS is to modify the weather file.  Using WeatherConverter, you would go from EPW to CSV, modify in CSV, then convert back to EPW.
> 
> 
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of hnoboam
> Sent: Friday, January 18, 2013 12:01 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Re: How do I override a temperature sensor?
> 
> 
> 
> OK, thanks.
> 
> Then how do I make E+ to use OAT_SENSOR_MOD value? I could not find any reference to "Outdoor Dry Bulb" in the IDF.
> 
> Homero
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx , "Griffith, Brent" wrote:
> >
> > Yes, it is circular. This is a common problem with EMS. Separation of sensor and actuator is usually needed.
> >
> > IF you just want to modify the sensor then you can use:
> > Set OAT_SENSOR_MOD = OAT_SENSOR + 6,
> >
> > From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx ] On Behalf Of hnoboam
> > Sent: Friday, January 18, 2013 11:53 AM
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
> > Subject: [EnergyPlus_Support] Re: How do I override a temperature sensor?
> >
> >
> >
> > It shows the OAT going up by 6 degrees each time step:
> > SETOAT,Line 1,SET OAT_ACTUATOR = OAT_SENSOR + 6,1.400000,
> > SETOAT,Line 1,SET OAT_ACTUATOR = OAT_SENSOR + 6,7.400000,
> > SETOAT,Line 1,SET OAT_ACTUATOR = OAT_SENSOR + 6,13.400000,
> >
> > The simulation ends when the OAT reaches the toasties 421.4 deg C. :-)
> >
> > Evidently when I read the OAT I'm not reading the original value from the weather file, but the already increased one.
> >
> > Thanks for your help
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx , Richard Raustad wrote:
> > >
> > > What does the edd file show?
> > >
> > > Use:
> > > Output:EnergyManagementSystem,
> > > Verbose, !- Actuator Availability Dictionary Reporting
> > > Verbose, !- Internal Variable Availability
> > > Dictionary Reporting
> > > Verbose; !- EMS Runtime Language Debug Output Level
> > >
> > >
> > > On 1/18/2013 1:33 PM, hnoboam wrote:
> > > > I would like to override a temperature sensor, for example I want to give the Outdoor Dry Bulb an offset of 6 C.
> > > > So I created an EMS Sensor:
> > > > EnergyManagementSystem:Sensor,
> > > > OAT_Sensor, !- Name
> > > > , !- Output:Variable or Output:Meter Index Key Name
> > > > Outdoor Dry Bulb; !- Output:Variable or Output:Meter Name
> > > >
> > > > and an EMS actuator
> > > > EnergyManagementSystem:Actuator,
> > > > OAT_Actuator,
> > > > Environment,
> > > > Weather Data,
> > > > Outdoor Dry Bulb;
> > > > and this program:
> > > > EnergyManagementSystem:Program,
> > > > SetOAT, !- Name
> > > > SET OAT_Actuator = OAT_Sensor + 4; !- Program Line 1
> > > >
> > > > But the simulation quickly ended when the OAT went out of bounds at 200+ deg C.
> > > >
> > > > Any advise? A different, simpler solution?
> > > >
> > > > Thanks
> > > >
> > > > Homero.
> > > >
> > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > 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
> > > >
> > > >
> > > >
> > > >
> > >
> > > --
> > > Richard A. Raustad
> > > Senior Research Engineer
> > > Florida Solar Energy Center
> > > University of Central Florida
> > > 1679 Clearlake Road
> > > Cocoa, FL 32922-5703
> > > Phone: (321) 638-1454
> > > Fax: (321) 638-1439 or 1010
> > > Visit our web site at: http://www.fsec.ucf.edu
> > >
> > > UCF - From Promise to Prominence: Celebrating 40 Years
> > >
> >
>




------------------------------------

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.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/