Chiller:Absorption:indirect in ironbug

grasshopper ironbug
1

Hello @MingboPeng
Thank you for your hard work

I want to make a custom HVAC system including an indirect absorption chiller. However, I couldn’t get any information about the indirect absorption chiller anywhere. When referring to the Energy Plus document(Group – Plant Equipment: Input Output Reference — EnergyPlus 24.2), I couldn’t find any such information in the ironbug. It’s not the indirect absorption chiller in the ironbug yet?

Can it be implemented using the string below? If implemented, I wonder how to connect ‘Gener Inlet Node Name’ and ‘Gener Outlet Node Name’ using hot water or steam.

Thank you for your kind reply in advance :slight_smile:

Chiller:Absorption:Indirect,
      Big Chiller,             !- Chiller Name
      100000,                  !- Nominal Capacity {W}
      250,                     !- Nominal Pumping Power {W}
      Big Chiller Inlet Node,  !- Evaporator Inlet Node Name
      Big Chiller Outlet Node, !- Evaporator Outlet Node Name
      Big Chiller Condenser Inlet Node,  !- Condenser Inlet Node Name
      Big Chiller Condenser Outlet Node,  !- Condenser Outlet Node Name
      0.15,                    !- Minimum Part Load Ratio
      1.0,                     !- Maximum Part Load Ratio
      0.65,                    !- Opt Part Load Ratio
      35.0,                    !- Temp Design Condenser Inlet {C}
      10.0,                    !- Temp Lower Limit Condenser Inlet {C}
      5.0,                     !- Chilled Water Outlet Temperature Lower Limit {C}
      0.0011,                  !- Design Chilled Water Flow Rate {m3/s}
      0.0011,                  !- Design Condenser Water Flow Rate {m3/s}
      VariableFlow,            !- Chiller Flow Mode
      SteamUseFPLR,            !- Generator Heat Input function of part-load ratio curve name
      PumpUseFPLR,             !- Pump Electric Input function of part-load ratio curve name
      AbsorberSteamInletNode,  !- Generator Inlet Node Name
      AbsorberSteamOutletNode, !- Generator Outlet Node Name
      CAPfCOND,                !- Capacity Correction function of condenser temperature curve name
      CAPfEVAP,                !- Capacity Correction function of evaporator temperature curve name
      ,                        !- Capacity Correction function of generator temperature curve name
      SteamFCondTemp,       !- Generator Heat Input Correction function of condenser temperature curve name
      SteamFEvapTemp,       !- Generator Heat Input Correction function of evaporator temperature curve name
      Steam,                   !- Generator Heat Source Type
      autosize,                !- Design Generator Volumetric Fluid Flow Rate {m3/s}
      30.0,                    !- Temp Lower Limit Generator Inlet {C}
      2.0,                     !- Degree of Subcooling in Steam Generator {C}
      12.0;                    !- Degree of Subcooling in Steam Condensate Loop {C}
2

Hi @Taek, I have not implemented the “Chiller:Absorption:Indirect” in the Ironbug. But I just checked the OpenStudio SDK, and they have added it, so it should be possible to support it in Ironbug.

In terms of this specific object, “Chiller:Absorption:Indirect”, I have never used previously, and I’m not sure how to make it work correctly with a generator loop. It’d take me some time to study and test it on my end.

If you could provide a simple sample file (EnergyPlus idf or OpenStudio osm file) for me to better understand this object, that would be great and speed up the Ironbug implementation.

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