Buildings.Templates.Data.Defaults
Package with default sizing parameters
Information
This package defines some constants that are either
- typical values used as default parameter values for models inside the package Buildings.Templates, or
- arbitrary values used for validation purposes only. Those are typically project-specific characteristics (e.g., chiller COP at nominal conditions) and should not be considered as generic default values.
Extends from Modelica.Icons.MaterialPropertiesPackage (Icon for package containing property classes).
Package Content
| Name | Description |
|---|---|
| TChiWatSup=7 + 273.15 | CHW supply temperature (AHRI 551/591) |
| TChiWatSup_min=3.3 + 273.15 | Minimum CHW supply temperature (typical) |
| TChiWatSup_max=16 + 273.15 | Maximum CHW supply temperature (typical) |
| TChiWatRet=12 + 273.15 | CHW return temperature (AHRI 551/591) |
| TConWatSup=30 + 273.15 | CW supply temperature (AHRI 551/591) |
| TConWatRet=35 + 273.15 | CW return temperature (AHRI 551/591) |
| TOutChi=35 + 273.15 | Outdoor air temperature for air-cooled chiller (AHRI 551/591) |
| TConEnt_min=13 + 273.15 | Minimum condenser entering fluid temperature (air or water) |
| TConEnt_max=45 + 273.15 | Maximum condenser entering fluid temperature (air or water) |
| TConLvg_min=16 + 273.15 | Minimum condenser leaving fluid temperature (air or water) |
| TConLvg_max=50 + 273.15 | Maximum condenser leaving fluid temperature (air or water) |
| TChiWatEcoEnt=18 + 273.15 | WSE entering CHW temperature |
| TChiWatEcoLvg=11 + 273.15 | WSE leaving CHW temperature |
| TConWatEcoEnt=9 + 273.15 | WSE entering CW temperature |
| TConWatEcoLvg=16 + 273.15 | WSE leaving CW temperature |
| TOutChiWatLck=16 + 273.15 | Outdoor air lockout temperature below which the CHW system is prevented from operating |
| dTLifChi_min=5 | Minimum chiller lift at minimum load |
| TOutDryCoo=TOutChi | Dry cooler entering air drybulb temperature |
| TWetBulTowEnt=24 + 273.15 | CT entering air wetbulb temperature |
| ratPFanByMFloConWatTow=340 | CT fan power divided by CW mass flow rate |
| ratMFloConWatByMFloAirTow=1.45 | CT CW mass flow rate divided by air mass flow rate |
| dpConWatFriTow=1E4 | CW flow-friction losses through open-circuit tower and piping only (without elevation head or valve) |
| dpConWatStaTow=3E4 | CW elevation head (for open cooling towers only) |
| dpConWatTowClo=5E4 | CW flow-friction losses through closed-circuit tower and piping only (without valve) |
| ratMFloAirByCapChi=1E-4 | Air mass flow rate divided by capacity for air-cooled chiller |
| COPChiAirCoo=2.99 | Air-cooled chiller COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C OAT) |
| COPChiWatCoo=5.33 | Water-cooled chiller COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C source LWT) |
| dpValIso=1E3 | Isolation or bypass valve pressure drop |
| dpValBypMin=3.5E4 | Minimum flow bypass valve pressure drop at design minimum flow for the largest unit |
| dpValChe=1E4 | Check valve pressure drop |
| dpChiWatChi=4E4 | Chiller CHW pressure drop |
| dpChiWatSet_min=5*6894 | Minimum CHW differential pressure setpoint used in CHW plant reset logic |
| dpChiWatRemSet_max=5E4 | Maximum CHW differential pressure setpoint remote from the CHW plant |
| dpChiWatLocSet_max=15E4 | Maximum CHW differential pressure setpoint local to the CHW plant |
| dpConWatChi=4E4 | Chiller CW pressure drop (water-cooled) |
| dpAirChi=500 | Chiller air pressure drop across condenser (air-cooled) |
| dpChiWatEco=3E4 | WSE CHW pressure drop |
| dpConWatEco=3E4 | WSE CW pressure drop |
| pChiWat_rel_nominal=2.5E5 | CHW system gauge pressure at design conditions |
| pHeaWat_rel_nominal=2.5E5 | HHW system gauge pressure at design conditions |
| dpHeaWatBoi=5E3 | Boiler HW pressure drop |
| THeaWatSup=80 + 273.15 | HW supply temperature |
| THeaWatConSup=65 + 273.15 | HW supply temperature for condensing boilers |
| THeaWatRet=55 + 273.15 | HW return temperature |
| TOutHeaWatLck=21 + 273.15 | Outdoor air lockout temperature above which the HW system is prevented from operating |
| dpHeaWatSet_min=5*6894 | Minimum HW differential pressure setpoint used in HW plant reset logic |
| dpHeaWatRemSet_max=5E4 | Maximum HW differential pressure setpoint remote from the HW plant |
| dpHeaWatLocSet_max=15E4 | Maximum HW differential pressure setpoint local to the CHW plant |
| dpHeaWatHp=3E4 | Heat pump HW pressure drop across condenser barrel |
| THeaWatSupHig=60 + 273.15 | HW supply temperature - High temperature level (AHRI 551/591) |
| THeaWatRetHig=50 + 273.15 | HW return temperature - High temperature level (AHRI 551/591) |
| THeaWatSupMed=50 + 273.15 | HW supply temperature - Medium temperature level (AHRI 551/591) |
| THeaWatRetMed=42 + 273.15 | HW return temperature - Medium temperature level (AHRI 551/591) |
| THeaWatSupLow=40 + 273.15 | HW supply temperature - Low temperature level (AHRI 551/591) |
| THeaWatRetLow=35 + 273.15 | HW return temperature - Low temperature level (AHRI 551/591) |
| TOutHpCoo=TOutChi | Outdoor air temperature for air-to-water heat pump rating - Cooling (AHRI 551/591) |
| TOutHpHeaHig=8 + 273.15 | Outdoor air temperature for air-to-water heat pump rating - High heating (AHRI 551/591) |
| TOutHpHeaLow=-8 + 273.15 | Outdoor air temperature for air-to-water heat pump rating - Low heating (AHRI 551/591) |
| TSouHpCoo=30 + 273.15 | Source fluid entering temperature for water-to-water heat pump rating - Cooling (AHRI 551/591) |
| TSouHpHea=12 + 273.15 | Source fluid entering temperature for water-to-water heat pump rating - Heating (AHRI 551/591) |
| COPHpAwHea=1.75 | Air-to-water heat pump heating COP (ASHRAE 90.1 2022 at 50 °C HWST, -8 °C OAT) |
| COPHpAwCoo=2.84 | Air-to-water heat pump cooling COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C OAT) |
| COPHpWwHea=3.61 | Water(brine)-to-water heat pump heating COP (ASHRAE 90.1 2022 at 50 °C HWST, 7 °C source LWT) |
| COPHpWwCoo=5.07 | Water(brine)-to-water heat pump cooling COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C source LWT) |
| ratVLiqByCap=1E-5 | Ratio of total fluid volume in hydronic system by installed capacity (ranges from 5 to 30 L/kW) |
Types and constants
constant Modelica.Units.SI.Temperature TChiWatSup = 7 + 273.15 "CHW supply temperature (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TChiWatSup_min = 3.3 + 273.15 "Minimum CHW supply temperature (typical)";
constant Modelica.Units.SI.Temperature TChiWatSup_max = 16 + 273.15 "Maximum CHW supply temperature (typical)";
constant Modelica.Units.SI.Temperature TChiWatRet = 12 + 273.15 "CHW return temperature (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TConWatSup = 30 + 273.15 "CW supply temperature (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TConWatRet = 35 + 273.15 "CW return temperature (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TOutChi = 35 + 273.15 "Outdoor air temperature for air-cooled chiller (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TConEnt_min = 13 + 273.15 "Minimum condenser entering fluid temperature (air or water)";
constant Modelica.Units.SI.Temperature TConEnt_max = 45 + 273.15 "Maximum condenser entering fluid temperature (air or water)";
constant Modelica.Units.SI.Temperature TConLvg_min = 16 + 273.15 "Minimum condenser leaving fluid temperature (air or water)";
constant Modelica.Units.SI.Temperature TConLvg_max = 50 + 273.15 "Maximum condenser leaving fluid temperature (air or water)";
constant Modelica.Units.SI.Temperature TChiWatEcoEnt = 18 + 273.15 "WSE entering CHW temperature";
constant Modelica.Units.SI.Temperature TChiWatEcoLvg = 11 + 273.15 "WSE leaving CHW temperature";
constant Modelica.Units.SI.Temperature TConWatEcoEnt = 9 + 273.15 "WSE entering CW temperature";
constant Modelica.Units.SI.Temperature TConWatEcoLvg = 16 + 273.15 "WSE leaving CW temperature";
constant Modelica.Units.SI.Temperature TOutChiWatLck = 16 + 273.15 "Outdoor air lockout temperature below which the CHW system is prevented from operating";
constant Modelica.Units.SI.TemperatureDifference dTLifChi_min = 5 "Minimum chiller lift at minimum load";
constant Modelica.Units.SI.Temperature TOutDryCoo = TOutChi "Dry cooler entering air drybulb temperature";
constant Modelica.Units.SI.Temperature TWetBulTowEnt = 24 + 273.15 "CT entering air wetbulb temperature";
constant Real ratPFanByMFloConWatTow(unit="W/(kg/s)") = 340 "CT fan power divided by CW mass flow rate";
constant Real ratMFloConWatByMFloAirTow(unit="1") = 1.45 "CT CW mass flow rate divided by air mass flow rate";
constant Modelica.Units.SI.PressureDifference dpConWatFriTow = 1E4 "CW flow-friction losses through open-circuit tower and piping only (without elevation head or valve)";
constant Modelica.Units.SI.PressureDifference dpConWatStaTow = 3E4 "CW elevation head (for open cooling towers only)";
constant Modelica.Units.SI.PressureDifference dpConWatTowClo = 5E4 "CW flow-friction losses through closed-circuit tower and piping only (without valve)";
constant Real ratMFloAirByCapChi(unit="(kg/s)/W") = 1E-4 "Air mass flow rate divided by capacity for air-cooled chiller";
constant Real COPChiAirCoo(unit="1") = 2.99 "Air-cooled chiller COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C OAT)";
constant Real COPChiWatCoo(unit="1") = 5.33 "Water-cooled chiller COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C source LWT)";
constant Modelica.Units.SI.PressureDifference dpValIso = 1E3 "Isolation or bypass valve pressure drop";
constant Modelica.Units.SI.PressureDifference dpValBypMin = 3.5E4 "Minimum flow bypass valve pressure drop at design minimum flow for the largest unit";
constant Modelica.Units.SI.PressureDifference dpValChe = 1E4 "Check valve pressure drop";
constant Modelica.Units.SI.PressureDifference dpChiWatChi = 4E4 "Chiller CHW pressure drop";
constant Modelica.Units.SI.PressureDifference dpChiWatSet_min = 5 * 6894 "Minimum CHW differential pressure setpoint used in CHW plant reset logic";
constant Modelica.Units.SI.PressureDifference dpChiWatRemSet_max = 5E4 "Maximum CHW differential pressure setpoint remote from the CHW plant";
constant Modelica.Units.SI.PressureDifference dpChiWatLocSet_max = 15E4 "Maximum CHW differential pressure setpoint local to the CHW plant";
constant Modelica.Units.SI.PressureDifference dpConWatChi = 4E4 "Chiller CW pressure drop (water-cooled)";
constant Modelica.Units.SI.PressureDifference dpAirChi = 500 "Chiller air pressure drop across condenser (air-cooled)";
constant Modelica.Units.SI.PressureDifference dpChiWatEco = 3E4 "WSE CHW pressure drop";
constant Modelica.Units.SI.PressureDifference dpConWatEco = 3E4 "WSE CW pressure drop";
constant Modelica.Units.SI.PressureDifference pChiWat_rel_nominal = 2.5E5 "CHW system gauge pressure at design conditions";
constant Modelica.Units.SI.PressureDifference pHeaWat_rel_nominal = 2.5E5 "HHW system gauge pressure at design conditions";
constant Modelica.Units.SI.PressureDifference dpHeaWatBoi = 5E3 "Boiler HW pressure drop";
constant Modelica.Units.SI.Temperature THeaWatSup = 80 + 273.15 "HW supply temperature";
constant Modelica.Units.SI.Temperature THeaWatConSup = 65 + 273.15 "HW supply temperature for condensing boilers";
constant Modelica.Units.SI.Temperature THeaWatRet = 55 + 273.15 "HW return temperature";
constant Modelica.Units.SI.Temperature TOutHeaWatLck = 21 + 273.15 "Outdoor air lockout temperature above which the HW system is prevented from operating";
constant Modelica.Units.SI.PressureDifference dpHeaWatSet_min = 5 * 6894 "Minimum HW differential pressure setpoint used in HW plant reset logic";
constant Modelica.Units.SI.PressureDifference dpHeaWatRemSet_max = 5E4 "Maximum HW differential pressure setpoint remote from the HW plant";
constant Modelica.Units.SI.PressureDifference dpHeaWatLocSet_max = 15E4 "Maximum HW differential pressure setpoint local to the CHW plant";
constant Modelica.Units.SI.PressureDifference dpHeaWatHp = 3E4 "Heat pump HW pressure drop across condenser barrel";
constant Modelica.Units.SI.Temperature THeaWatSupHig = 60 + 273.15 "HW supply temperature - High temperature level (AHRI 551/591)";
constant Modelica.Units.SI.Temperature THeaWatRetHig = 50 + 273.15 "HW return temperature - High temperature level (AHRI 551/591)";
constant Modelica.Units.SI.Temperature THeaWatSupMed = 50 + 273.15 "HW supply temperature - Medium temperature level (AHRI 551/591)";
constant Modelica.Units.SI.Temperature THeaWatRetMed = 42 + 273.15 "HW return temperature - Medium temperature level (AHRI 551/591)";
constant Modelica.Units.SI.Temperature THeaWatSupLow = 40 + 273.15 "HW supply temperature - Low temperature level (AHRI 551/591)";
constant Modelica.Units.SI.Temperature THeaWatRetLow = 35 + 273.15 "HW return temperature - Low temperature level (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TOutHpCoo = TOutChi "Outdoor air temperature for air-to-water heat pump rating - Cooling (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TOutHpHeaHig = 8 + 273.15 "Outdoor air temperature for air-to-water heat pump rating - High heating (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TOutHpHeaLow = -8 + 273.15 "Outdoor air temperature for air-to-water heat pump rating - Low heating (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TSouHpCoo = 30 + 273.15 "Source fluid entering temperature for water-to-water heat pump rating - Cooling (AHRI 551/591)";
constant Modelica.Units.SI.Temperature TSouHpHea = 12 + 273.15 "Source fluid entering temperature for water-to-water heat pump rating - Heating (AHRI 551/591)";
constant Real COPHpAwHea(unit="1") = 1.75 "Air-to-water heat pump heating COP (ASHRAE 90.1 2022 at 50 °C HWST, -8 °C OAT)";
constant Real COPHpAwCoo(unit="1") = 2.84 "Air-to-water heat pump cooling COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C OAT)";
constant Real COPHpWwHea(unit="1") = 3.61 "Water(brine)-to-water heat pump heating COP (ASHRAE 90.1 2022 at 50 °C HWST, 7 °C source LWT)";
constant Real COPHpWwCoo(unit="1") = 5.07 "Water(brine)-to-water heat pump cooling COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C source LWT)";
constant Real ratVLiqByCap(unit="m3/W") = 1E-5 "Ratio of total fluid volume in hydronic system by installed capacity (ranges from 5 to 30 L/kW)";