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





Ok! Thanks Jim!

 

Regards,
 
Fabiano Ferreira

 

De: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Em nome de Jim Dirkes
Enviada em: Thursday, September 27, 2012 4:27 PM
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Assunto: RE: [EnergyPlus_Support] Re: Modeling a Packaged Rooftop Heat Pump according to Appendix G

 

 

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?

 

 

 

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="">
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" <direzionecontraria@...> 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" <fabiano.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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