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[EnergyPlus_Support] Re: How do I override a temperature sensor?
Hi, Griffith,
I have the same problem about the sensor reading overriding.I tried you suggestions.But I have some problems now.
1. What do you mean "separate the sensor and actuator"? How can I do that?
2. I used the "OUTDOOR AIR SYSTEM NODE"
EnergyManagementSystem:Actuator,
OAT_Sensor_Mod, !- Name
Outdoor Air System Node, !- Actuated Component Unique Name
VAV SYS 1 OUTSIDE AIR INLET, !- Actuated Component Type
Drybulb Temperature; !- Actuated Component Control Type
However, E+ gave me the error said:
Severe ** Invalid Actuated Component Type =VAV SYS 1 OUTSIDE AIR INLET
** ~~~ ** Entered in EnergyManagementSystem:Actuator=OAT_SENSOR_MOD
** ~~~ ** Component Type not found
** ~~~ ** Review .edd file for valid component types.
** Severe ** Invalid Actuated Component Unique Name =OUTDOOR AIR SYSTEM NODE
** ~~~ ** Entered in EnergyManagementSystem:Actuator=OAT_SENSOR_MOD
** ~~~ ** Component Unique key name not found
** ~~~ ** Review edd file for valid component names.
** Severe ** Invalid Actuated Component Control Type =DRYBULB TEMPERATURE
** ~~~ ** Entered in EnergyManagementSystem:Actuator=OAT_SENSOR_MOD
** ~~~ ** Control Type not found
** ~~~ ** Review edd file for valid component control types.
Could you please take a look for me?
Thanks very much.
Xiwang Li
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" <brent.griffith@...> 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<mailto:EnergyPlus_Support%40yahoogroups.com>, "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%40yahoogroups.com> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support%40yahoogroups.com>] On Behalf Of hnoboam
> > Sent: Friday, January 18, 2013 11:53 AM
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support%40yahoogroups.com>
> > 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<mailto:EnergyPlus_Support%40yahoogroups.com> , 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.
> > > >
> > > >
> > > >
> > > > ------------------------------------
> > > >
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> > > >
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> > > >
> > > >
> > >
> > > --
> > > 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
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>
------------------------------------
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