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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