[EnergyPlus_Support] Re: Modeling a Packaged Rooftop Heat Pump according to Appendix G

["FrancescoP" <direzionecontraria@xxxxxxxx>]

In order to model a System 4 - PSZ-HP for a baseline model of Annex G of ASHRAE 90.1-2007 I am using  AirLoopHVAC:UnitaryHeatPump:AirToAir
I am adding a message in this old discussion because I have still a doubt: in order to comply with Annex G of ASHRAE 90.1-2007 how shall I fill the fields of Coil:Heating:DX:SingleSpeed and of Coil:Cooling:DX:SingleSpeed?
Here you can see what I did:
http://imageshack.us/f/341/coilheating.jpg/
http://imageshack.us/f/7/coilcooling.jpg/
My doubts regard particularly "Minimum Outdoor Dry-Bulb Temperature for Compressor Operation", "Outdoor Dry-Bulb Temperature to Turn On Compressor", "Defrost Strategy". Any suggestion, please?

In the same model I used also the following object ("Maximum Outdoor Dry-Bulb Temperature for Supplemental Heater Operation" is 4°C according to G3.1.3.1):

AirLoopHVAC:UnitaryHeatPump:AirToAir,
    1primo_disimpegno Unitary HP AirToAir/1,  !- Name
    2,                       !- Availability Schedule Name
    1primo_disimpegno Unitary HP AirToAir/1 Mixed Air Outlet,  !- Air Inlet Node Name
    1primo_disimpegno Supply Side Outlet 1,  !- Air Outlet Node Name
    autosize,                !- Supply Air Flow Rate During Cooling Operation {m3/s}
    autosize,                !- Supply Air Flow Rate During Heating Operation {m3/s}
    autosize,                !- Supply Air Flow Rate When No Cooling or Heating is Needed {m3/s}
    1primo:Disimpegno,       !- Controlling Zone or Thermostat Location
    Fan:ConstantVolume,      !- Supply Air Fan Object Type
    1primo_disimpegno Unitary HP AirToAir/1 Supply Fan,  !- Supply Air Fan Name
    Coil:Heating:DX:SingleSpeed,  !- Heating Coil Object Type
    1primo_disimpegno Unitary HP AirToAir/1 DX Heating Coil,  !- Heating Coil Name
    Coil:Cooling:DX:SingleSpeed,  !- Cooling Coil Object Type
    1primo_disimpegno Unitary HP AirToAir/1 DX Cooling Coil,  !- Cooling Coil Name
    Coil:Heating:Electric,   !- Supplemental Heating Coil Object Type
    1primo_disimpegno Unitary HP AirToAir/1 Electric Heating Coil,  !- Supplemental Heating Coil Name
    autosize,                !- Maximum Supply Air Temperature from Supplemental Heater {C}
    4,                       !- Maximum Outdoor Dry-Bulb Temperature for Supplemental Heater Operation {C}
    BlowThrough,             !- Fan Placement
    2;                       !- Supply Air Fan Operating Mode Schedule Name

Best Regards
Francesco Passerini



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes  wrote:
>
> Perfect!



> 
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com 
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Fabiano Domingues Ferreira
> Sent: Thursday, September 27, 2012 2:35 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: RES: [EnergyPlus_Support] Re: Modeling a Packaged Rooftop Heat Pump according to Appendix G
> 
> 
> Hi Jim,
> 
> So to comply with the requirement I need to set the supplemental heating coil object type to Coil Heating Eletric and  Maximum Outdoor Dry-Bulb Temperature for Supplemental Heater Operation to 4° C?
> 
> 
> 
> [cid:image001.png@...]
> Thanks,
> 
> Fabiano Ferreira
> 
> De: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Em nome de Jim Dirkes
> Enviada em: Thursday, September 27, 2012 11:40 AM
> Para: EnergyPlus_Support@xxxxxxxxxxxxxxx 
> Assunto: RE: [EnergyPlus_Support] Re: Modeling a Packaged Rooftop Heat Pump according to Appendix G
> 
> 
> The AirLoopHVAC:UnitaryHeatPump:AirToAir object has made it easy for you!  Notice the "Supplemental Heating Coil Object Type"
> 
> 
> 
> AirLoopHVAC:UnitaryHeatPump:AirToAir
> 
> Name
> 
> AirLoop_UnitCool1_GymBaseSys4
> 
> Availability Schedule Name
> 
> SchCpct_FanOpern
> 
> Air Inlet Node Name
> 
> NodeOut_MA_GymBaseSys4
> 
> Air Outlet Node Name
> 
> NodeOut_Air_GymBaseSys4
> 
> Supply Air Flow Rate During Cooling Operation
> 
> Autosize
> 
> Supply Air Flow Rate During Heating Operation
> 
> Autosize
> 
> Supply Air Flow Rate When No Clg or Htg is Needed
> 
> Autosize
> 
> Controlling Zone or Thermostat Location
> 
> Gym
> 
> Supply Air Fan Object Type
> 
> Fan:ConstantVolume
> 
> Supply Air Fan Name
> 
> SFan_GymBaseSys4
> 
> Heating Coil Object Type
> 
> Coil:Heating:DX:SingleSpeed
> 
> Heating Coil Name
> 
> HtgCoil_GymBaseSys4
> 
> Cooling Coil Object Type
> 
> Coil:Cooling:DX:SingleSpeed
> 
> Cooling Coil Name
> 
> ClgCoil1_GymBaseSys4
> 
> Supplemental Heating Coil Object Type
> 
> Coil:Heating:Electric
> 
> Supplemental Heating Coil Name
> 
> SupplHtgCoil_GymBaseSys4
> 
> Max. Supply Air Temp. from Suppl. Heater
> 
> 35
> 
> Max. Outdoor DB Temp. for Suppl. Htr Operation
> 
> 7.2
> 
> Fan Placement
> 
> DrawThrough
> 
> Supply Air Fan Operating Mode Schedule Name
> 
> SchCpct_AlwaysOn
> 
> 
> 
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com 
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of direzionecontraria
> Sent: Thursday, September 27, 2012 10:08 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
> Subject: [EnergyPlus_Support] Re: Modeling a Packaged Rooftop Heat Pump according to Appendix G
> 
> 
> 
> I have found a document:
> http://www.google.co.uk/url?sa=t&rct=j&q=ashrae+heat+G3.1.3.1&source=web&cd=1&ved=0CCAQFjAA&url=http%3A%2F%2Fwww.ashrae.org%2FFile%2520Library%2FdocLib%2FStdsInterpretations%2FIC_90-1-2007-9.pdf&ei=YVRkUM2PLIaB4gSKnYDoCQ&usg=AFQjCNHv-O3Cqa8DGj73KAEy30w4ynLQZQ
> I think I did confusion between defrost and "electric auxiliary heat"... The electric auxiliary heat shall be a specific electric coil. In EnergyPlus what is the best solution to model the control of electric auxiliary heat system according to G3.1.3.1?
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx , "FrancescoP" > wrote:
> >
> > Probably I'll impose the condition concerning the temperature for the activation of the auxiliary heat through the field "Maximum Outdoor Dry-Bulb Temperature for Defrost Operation" of the object Coil:Heating:DX:SingleSpeed
> > Do you think that it could be a good solution?
> > The biggest problem in the interpretation of G3.1.3.1 is that I don't understand what "multistage space thermostats" mean.
> > Best Regards
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx , "Fabiano Domingues Ferreira"  wrote:
> > >
> > > Hi,
> > >
> > >
> > >
> > > I'm modeling a project on the DesignBuilder according to the Appendix G of ASHRAE 90.1-2007 Standard.
> > >
> > > According to the Standard the system that I need to model is a Packaged Rooftop Heat Pump. I have a problem to comply with the item G3.1.3.1 Heat Pump, follow bellow.
> > >
> > >
> > >
> > > "G3.1.3.1 Heat Pump. Electric air-source heat pump shall be modeled with electric auxiliary heat. The system shall be controlled with multistage space thermostats and an outdoor air thermostat wired to energize auxiliary heat only on the last thermostat stage and when outdoor air temperature is less than 4°C."
> > >
> > >
> > >
> > > I have already modeled the auxiliary heat, I just don't know how to set the thermostats. Could you tell me how can I set those thermostats on the system?
> > >
> > >
> > >
> > > Regards,
> > >
> > > Fabiano Ferreira
> > >
> > >
> > >
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