[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] heat recovery parameters

Thank you very much for your answer, I change the temperature limits and now
the general behaviour seems OK.
Now (I am sorry) I have another question. I'm using an heat recovery object,
but I can't understand the input parameter: "nominal supply air inlet
temperature", "nominal supply air outlet temperature", "nominal secondary
air inlet temperature". How do such parameters influence the operating of
the object? Have I to define two objects: one for the summer and one for the
winter? If  I set the " nominal supply air inlet temperature" at something
like 5 °C means that the heat recovery works only when the outside air
temperature is above such value? and If I set the "nominal secondary air
inlet temperature" at something like 19 °C means if the temperature from the
zone is below such a value the heat recovery doesn't work? Or, more easily,
such parameters are used by E+ as design value to define and size the heat
exchanger?

Sorry for my very bad English and thank you for any suggestion.
Roberto

----- Original Message -----
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Tuesday, September 23, 2003 8:04 PM
Subject: Re: [EnergyPlus_Support] using economizer


> This can happen if the economizer mixed air set point is too low,
> causing the economizer to bring in too much cool air which then must
> be offset by additional heating coil operation.  Check the setpoint
> on the mixed air node.  This must be set by using a setpoint manager.
>  See the 5ZoneAuto.idf example for assistance.  You can use report
> variable "System Node Setpoint Temp" to verify the setpoint on HVAC
> nodes.
>
> Mike
>
> On 23 Sep 2003, at 17:23, Roberto Lollini wrote:
>
> > I am trying to set the CONTROLLER:OUTSIDE AIR, but I found a very
> > strange thing: when I set the EconomizerChoice on NO ECONOMISER the
> > gas facility consumption become the half with respect to the
> > simulation using ECONOMIZER. I can't understand how with the
> > economizer "on" the gas consumption is two time the case without it.
> > Could anyone please help me to understand this behaviour? Here
> > attached the relative part of my input file.
> >
> > Thank you very much,
> > Roberto
> > !- =========== ALL OBJECTS IN CLASS: CONTROLLER:OUTSIDE AIR
> > !===========
> >
> > CONTROLLER:OUTSIDE AIR,
> >
> > outside air controller, !- Name
> >
> > ECONOMIZER, !- EconomizerChoice
> >
> > RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> >
> > RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> >
> > NO LOCKOUT, !- Lockout
> >
> > FIXED MINIMUM, !- MinimumLimit
> >
> > oa mixer vendita outlet node, !- Control_Node
> >
> > oa vendita mixer inlet node, !- Actuated_Node
> >
> > 0.0065, !- minimum outside air flow rate {m3/s}
> >
> > autosize, !- maximum outside air flow rate {m3/s}
> >
> > 24, !- temperature limit {C}
> >
> > 10, !- temperature lower limit {C}
> >
> > 0, !- enthalpy limit {J/kg}
> >
> > vendita reliefair mixer outlet node, !- Relief_Air_Outlet_Node
> >
> > primary air loop vendita inlet node, !- Return_Air_Node
> >
> > min oa vendita sched; !- Minimum Outside Air Schedule Name
> >
> >
> >
> > CONTROLLER:OUTSIDE AIR,
> >
> > outside air controller galleria, !- Name
> >
> > ECONOMIZER, !- EconomizerChoice
> >
> > RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> >
> > RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> >
> > NO LOCKOUT, !- Lockout
> >
> > FIXED MINIMUM, !- MinimumLimit
> >
> > oa mixer galleria outlet node, !- Control_Node
> >
> > oa galleria mixer inlet node, !- Actuated_Node
> >
> > 0.0115, !- minimum outside air flow rate {m3/s}
> >
> > autosize, !- maximum outside air flow rate {m3/s}
> >
> > 24, !- temperature limit {C}
> >
> > 10, !- temperature lower limit {C}
> >
> > 0, !- enthalpy limit {J/kg}
> >
> > galleria reliefair mixer outlet node, !- Relief_Air_Outlet_Node
> >
> > primary air loop galleria inlet node, !- Return_Air_Node
> >
> > min oa galleria sched; !- Minimum Outside Air Schedule Name
> >
> >
> >
> > CONTROLLER:OUTSIDE AIR,
> >
> > outside air controller uffici, !- Name
> >
> > ECONOMIZER, !- EconomizerChoice
> >
> > RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> >
> > RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> >
> > NO LOCKOUT, !- Lockout
> >
> > FIXED MINIMUM, !- MinimumLimit
> >
> > oa mixer uffici outlet node, !- Control_Node
> >
> > oa uffici mixer inlet node, !- Actuated_Node
> >
> > 0.011, !- minimum outside air flow rate {m3/s}
> >
> > autosize, !- maximum outside air flow rate {m3/s}
> >
> > 24, !- temperature limit {C}
> >
> > 10, !- temperature lower limit {C}
> >
> > 0, !- enthalpy limit {J/kg}
> >
> > uffici reliefair mixer outlet node, !- Relief_Air_Outlet_Node
> >
> > primary air loop uffici inlet node, !- Return_Air_Node
> >
> > min oa uffici sched; !- Minimum Outside Air Schedule Name
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > ------------------------ Yahoo! Groups Sponsor
> > ---------------------~--> Upgrade to 128-Bit SSL Security!
> > http://us.click.yahoo.com/p7cEmB/s7qGAA/yigFAA/dkFolB/TM
> > ---------------------------------------------------------------------~
> > ->
> >
> > To unsubscribe from this group, send an email to:
> > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> >
> > 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 not allowed -- please post any files to the
> > appropriate folder in the Files are of the Support Web Site.
> >
> >
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
>
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
> To unsubscribe from this group, send an email to:
> EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
>
> 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 not allowed -- please post any files to the appropriate
folder in the Files are of the Support Web Site.
>
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>


------------------------ Yahoo! Groups Sponsor ---------------------~-->
Upgrade to 128-Bit SSL Security!
http://us.click.yahoo.com/p7cEmB/s7qGAA/yigFAA/dkFolB/TM
---------------------------------------------------------------------~->

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

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 not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 

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