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Re: [EnergyPlus_Support] heat recovery parameters

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] heat recovery parameters
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Thu, 25 Sep 2003 09:55:26 -0500
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You only need to define one heat exchanger object for all seasons.  
The nominal values for the HEAT EXCHANGER:AIR TO AIR:FLAT PLATE are 
used to define the size of the heat exchanger and to determine its 
effectiveness.  They are not used to set any type of temperature 
limits on operation.  There is a second type of heat exchanger, HEAT 
EXCHANGER:AIR TO AIR:GENERIC which has effectiveness as an input 
rather than nominal inlet/output temperatures.  Use the one which is 
most convenient.

Mike



On 25 Sep 2003, at 16:39, Roberto Lollini wrote:

> 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]
> > >
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> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@xxxxxxxx
> >
> >
> >
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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References:
- [EnergyPlus_Support] heat recovery parameters
  - From: Roberto Lollini

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