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

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




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
> > >
> > >
> > >
> > > NOTIFICAÇÃO<font><br>
> > > </font>Esta mensagem destina-se exclusivamente às pessoas identificadas e pode conter informações confidenciais sujeitas a proteção legal de comunicação. A leitura, uso, divulgação, cópia, distribuição ou disseminação por qualquer meio ou forma desta mensagem ou seu conteúdo está terminantemente proibida e poderá caracterizar ilícito civil e penal, sujeitando o responsável às penalidades aplicáveis. Caso a mensagem tenha sido recebida por engano, solicitamos a gentileza de informar ao remetente por e-mail ou por telefone usando as informações de contato no final do correio eletrônico (e-mail) e apague do seu computador. Muito Obrigado.<font><br>
> > > </font>LEGAL<font><br>
> > > </font>This message contains information which is confidential and may be privileged. Unless you are the addressee (or authorized to receive for the addressee), you are expressly prohibited to use, copy, distribute, disseminate or disclose in any way or by any mechanism to anyone the message or any information contained. If you have received the message in error, please advise the sender by reply e-mail or by telephone using the information in the sender signature above and delete the message. Thank you very much.<font> <br>
> > > </font>AVISO Y NOTIFICACION<font><br>
> > > </font>Este mensaje de correo electrónico y su contenido son estrictamente confidenciales. Si usted no es el destinatario o persona debidamente autorizada y responsable por la entrega de este documento y su contenido al destinatario, por la presente se le notifica que la publicación, uso, copia, distribución o reproducción de este correo electrónico y su contenido por cualquier medio o mecanismo esta estrictamente prohibida. Si usted ha recibido este correo electrónico por error, le agradecemos notificarlo de inmediato al remitente por correo electrónico (email) o avisar por teléfono al remitente, e inmediatamente borrar esta comunicación de su computadora. Muchas gracias.<font>
> > > <pre>
> > >
> >
> 
> The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail.
> 
> We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses.
>
</pre></font>



------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

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

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