packageDefaults
Package with default sizing parameters
Extends from Modelica.Icons.MaterialPropertiesPackage (Icon for package containing property classes).
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.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Temperature | TChiWatSup | 7 + 273.15 | CHW supply temperature (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TChiWatSup_min | 3.3 + 273.15 | Minimum CHW supply temperature (typical) |
| Modelica.Units.SI.Temperature | TChiWatSup_max | 16 + 273.15 | Maximum CHW supply temperature (typical) |
| Modelica.Units.SI.Temperature | TChiWatRet | 12 + 273.15 | CHW return temperature (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TConWatSup | 30 + 273.15 | CW supply temperature (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TConWatRet | 35 + 273.15 | CW return temperature (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TOutChi | 35 + 273.15 | Outdoor air temperature for air-cooled chiller (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TConEnt_min | 13 + 273.15 | Minimum condenser entering fluid temperature (air or water) |
| Modelica.Units.SI.Temperature | TConEnt_max | 45 + 273.15 | Maximum condenser entering fluid temperature (air or water) |
| Modelica.Units.SI.Temperature | TConLvg_min | 16 + 273.15 | Minimum condenser leaving fluid temperature (air or water) |
| Modelica.Units.SI.Temperature | TConLvg_max | 50 + 273.15 | Maximum condenser leaving fluid temperature (air or water) |
| Modelica.Units.SI.Temperature | TChiWatEcoEnt | 18 + 273.15 | WSE entering CHW temperature |
| Modelica.Units.SI.Temperature | TChiWatEcoLvg | 11 + 273.15 | WSE leaving CHW temperature |
| Modelica.Units.SI.Temperature | TConWatEcoEnt | 9 + 273.15 | WSE entering CW temperature |
| Modelica.Units.SI.Temperature | TConWatEcoLvg | 16 + 273.15 | WSE leaving CW temperature |
| Modelica.Units.SI.Temperature | TOutChiWatLck | 16 + 273.15 | Outdoor air lockout temperature below which the CHW system is prevented from operating |
| Modelica.Units.SI.TemperatureDifference | dTLifChi_min | 5 | Minimum chiller lift at minimum load |
| Modelica.Units.SI.Temperature | TOutDryCoo | TOutChi | Dry cooler entering air drybulb temperature |
| Modelica.Units.SI.Temperature | TWetBulTowEnt | 24 + 273.15 | CT entering air wetbulb temperature |
| Real | ratPFanByMFloConWatTow | 340 | CT fan power divided by CW mass flow rate |
| Real | ratMFloConWatByMFloAirTow | 1.45 | CT CW mass flow rate divided by air mass flow rate |
| Modelica.Units.SI.PressureDifference | dpConWatFriTow | 1E4 | CW flow-friction losses through open-circuit tower and piping only (without elevation head or valve) |
| Modelica.Units.SI.PressureDifference | dpConWatStaTow | 3E4 | CW elevation head (for open cooling towers only) |
| Modelica.Units.SI.PressureDifference | dpConWatTowClo | 5E4 | CW flow-friction losses through closed-circuit tower and piping only (without valve) |
| Real | ratMFloAirByCapChi | 1E-4 | Air mass flow rate divided by capacity for air-cooled chiller |
| Real | COPChiAirCoo | 2.99 | Air-cooled chiller COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C OAT) |
| Real | COPChiWatCoo | 5.33 | Water-cooled chiller COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C source LWT) |
| Modelica.Units.SI.PressureDifference | dpValIso | 1E3 | Isolation or bypass valve pressure drop |
| Modelica.Units.SI.PressureDifference | dpValBypMin | 3.5E4 | Minimum flow bypass valve pressure drop at design minimum flow for the largest unit |
| Modelica.Units.SI.PressureDifference | dpValChe | 1E4 | Check valve pressure drop |
| Modelica.Units.SI.PressureDifference | dpChiWatChi | 4E4 | Chiller CHW pressure drop |
| Modelica.Units.SI.PressureDifference | dpChiWatSet_min | 5*6894 | Minimum CHW differential pressure setpoint used in CHW plant reset logic |
| Modelica.Units.SI.PressureDifference | dpChiWatRemSet_max | 5E4 | Maximum CHW differential pressure setpoint remote from the CHW plant |
| Modelica.Units.SI.PressureDifference | dpChiWatLocSet_max | 15E4 | Maximum CHW differential pressure setpoint local to the CHW plant |
| Modelica.Units.SI.PressureDifference | dpConWatChi | 4E4 | Chiller CW pressure drop (water-cooled) |
| Modelica.Units.SI.PressureDifference | dpAirChi | 500 | Chiller air pressure drop across condenser (air-cooled) |
| Modelica.Units.SI.PressureDifference | dpChiWatEco | 3E4 | WSE CHW pressure drop |
| Modelica.Units.SI.PressureDifference | dpConWatEco | 3E4 | WSE CW pressure drop |
| Modelica.Units.SI.PressureDifference | pChiWat_rel_nominal | 1.0E5 | CHW system gauge pressure at design conditions |
| Modelica.Units.SI.PressureDifference | pHeaWat_rel_nominal | 2.5E5 | HHW system gauge pressure at design conditions |
| Modelica.Units.SI.PressureDifference | dpHeaWatBoi | 5E3 | Boiler HW pressure drop |
| Modelica.Units.SI.Temperature | THeaWatSup | 80 + 273.15 | HW supply temperature |
| Modelica.Units.SI.Temperature | THeaWatConSup | 65 + 273.15 | HW supply temperature for condensing boilers |
| Modelica.Units.SI.Temperature | THeaWatRet | 55 + 273.15 | HW return temperature |
| Modelica.Units.SI.Temperature | TOutHeaWatLck | 21 + 273.15 | Outdoor air lockout temperature above which the HW system is prevented from operating |
| Modelica.Units.SI.PressureDifference | dpHeaWatSet_min | 5*6894 | Minimum HW differential pressure setpoint used in HW plant reset logic |
| Modelica.Units.SI.PressureDifference | dpHeaWatRemSet_max | 5E4 | Maximum HW differential pressure setpoint remote from the HW plant |
| Modelica.Units.SI.PressureDifference | dpHeaWatLocSet_max | 15E4 | Maximum HW differential pressure setpoint local to the CHW plant |
| Modelica.Units.SI.PressureDifference | dpHeaWatHp | 3E4 | Heat pump HW pressure drop across condenser barrel |
| Modelica.Units.SI.Temperature | THeaWatSupHig | 60 + 273.15 | HW supply temperature - High temperature level (AHRI 551/591) |
| Modelica.Units.SI.Temperature | THeaWatRetHig | 50 + 273.15 | HW return temperature - High temperature level (AHRI 551/591) |
| Modelica.Units.SI.Temperature | THeaWatSupMed | 50 + 273.15 | HW supply temperature - Medium temperature level (AHRI 551/591) |
| Modelica.Units.SI.Temperature | THeaWatRetMed | 42 + 273.15 | HW return temperature - Medium temperature level (AHRI 551/591) |
| Modelica.Units.SI.Temperature | THeaWatSupLow | 40 + 273.15 | HW supply temperature - Low temperature level (AHRI 551/591) |
| Modelica.Units.SI.Temperature | THeaWatRetLow | 35 + 273.15 | HW return temperature - Low temperature level (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TOutHpCoo | TOutChi | Outdoor air temperature for air-to-water heat pump rating - Cooling (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TOutHpHeaHig | 8 + 273.15 | Outdoor air temperature for air-to-water heat pump rating - High heating (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TOutHpHeaLow | -8 + 273.15 | Outdoor air temperature for air-to-water heat pump rating - Low heating (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TSouHpCoo | 30 + 273.15 | Source fluid entering temperature for water-to-water heat pump rating - Cooling (AHRI 551/591) |
| Modelica.Units.SI.Temperature | TSouHpHea | 12 + 273.15 | Source fluid entering temperature for water-to-water heat pump rating - Heating (AHRI 551/591) |
| Real | COPHpAwHea | 1.75 | Air-to-water heat pump heating COP (ASHRAE 90.1 2022 at 50 °C HWST, -8 °C OAT) |
| Real | COPHpAwCoo | 2.84 | Air-to-water heat pump cooling COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C OAT) |
| Real | COPHpWwHea | 3.61 | Water(brine)-to-water heat pump heating COP (ASHRAE 90.1 2022 at 50 °C HWST, 7 °C source LWT) |
| Real | COPHpWwCoo | 5.07 | Water(brine)-to-water heat pump cooling COP (ASHRAE 90.1 2022 at 7 °C CHWST, 35 °C source LWT) |
| Real | ratVLiqByCap | 1E-5 | Ratio of total fluid volume in hydronic system by installed capacity (ranges from 5 to 30 L/kW) |
Revisions
-
November 18, 2022, by Antoine Gautier:
First implementation.