Class: OpenStudio::Model::Model

Inherits:
Object
  • Object
show all
Defined in:
lib/measures/create_typical_deer_building_from_model/resources/Model.hvac.rb,
lib/measures/create_typical_doe_building_from_model/resources/Model.hvac.rb

Overview

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Instance Method Summary collapse

Instance Method Details

#add_cbecs_hvac_system(standard, system_type, zones) ⇒ Object

Adds the HVAC system as derived from the combinations of CBECS 2012 MAINHT and MAINCL fields. Mapping between combinations and HVAC systems per www.nrel.gov/docs/fy08osti/41956.pdf Table C-31



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# File 'lib/measures/create_typical_deer_building_from_model/resources/Model.hvac.rb', line 13

def add_cbecs_hvac_system(standard, system_type, zones)
  # the 'zones' argument includes zones that have heating, cooling, or both
  # if the HVAC system type serves a single zone, handle zones with only heating separately by adding unit heaters
  # applies to system types PTAC, PTHP, PSZ-AC, and Window AC
  heated_and_cooled_zones = zones.select { |zone| standard.thermal_zone_heated?(zone) && standard.thermal_zone_cooled?(zone) }
  heated_zones = zones.select { |zone| standard.thermal_zone_heated?(zone) }
  cooled_zones = zones.select { |zone| standard.thermal_zone_cooled?(zone) }
  cooled_only_zones = zones.select { |zone| !standard.thermal_zone_heated?(zone) && standard.thermal_zone_cooled?(zone) }
  heated_only_zones = zones.select { |zone| standard.thermal_zone_heated?(zone) && !standard.thermal_zone_cooled?(zone) }
  system_zones = heated_and_cooled_zones + cooled_only_zones

  # system type naming convention:
  # [ventilation strategy] [ cooling system and plant] [heating system and plant]

  case system_type

  when 'Baseboard electric'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Baseboard gas boiler'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Baseboard central air source heat pump'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_zones)

  when 'Baseboard district hot water'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_zones)

  when 'Direct evap coolers with baseboard electric'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'Direct evap coolers with baseboard gas boiler'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'Direct evap coolers with baseboard central air source heat pump'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_zones)
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'Direct evap coolers with baseboard district hot water'
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_zones)
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'Direct evap coolers with forced air furnace'
    # Using unit heater to represent forced air furnace to limit to one airloop per thermal zone.
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'Direct evap coolers with gas unit heaters'
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'Direct evap coolers with no heat'
    standard.model_add_hvac_system(self, 'Evaporative Cooler', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'DOAS with fan coil chiller with boiler'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil chiller with central air source heat pump'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil chiller with district hot water'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil chiller with baseboard electric'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'DOAS with fan coil chiller with gas unit heaters'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'DOAS with fan coil chiller with no heat'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil air-cooled chiller with boiler'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled',
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil air-cooled chiller with central air source heat pump'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled',
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil air-cooled chiller with district hot water'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled',
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil air-cooled chiller with baseboard electric'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled',
                                   zone_equipment_ventilation: false)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'DOAS with fan coil air-cooled chiller with gas unit heaters'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled',
                                   zone_equipment_ventilation: false)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'DOAS with fan coil air-cooled chiller with no heat'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled',
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil district chilled water with boiler'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil district chilled water with central air source heat pump'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'AirSourceHeatPump', znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'AirSourceHeatPump', znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil district chilled water with district hot water'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with fan coil district chilled water with baseboard electric'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'DOAS with fan coil district chilled water with gas unit heaters'
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'DOAS with fan coil district chilled water with no heat '
    standard.model_add_hvac_system(self, 'DOAS', ht = nil, znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with VRF'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'Electricity', znht = nil, cl = 'Electricity', zones,
                                   air_loop_heating_type: 'DX',
                                   air_loop_cooling_type: 'DX')
    standard.model_add_hvac_system(self, 'VRF', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'DOAS with water source heat pumps fluid cooler with boiler'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Water Source Heat Pumps', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   heat_pump_loop_cooling_type: 'FluidCooler',
                                   zone_equipment_ventilation: false)

  when 'DOAS with water source heat pumps cooling tower with boiler'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Water Source Heat Pumps', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   heat_pump_loop_cooling_type: 'CoolingTower',
                                   zone_equipment_ventilation: false)

  when 'DOAS with water source heat pumps with ground source heat pump'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'Electricity', znht = nil, cl = 'Electricity', zones,
                                   air_loop_heating_type: 'DX',
                                   air_loop_cooling_type: 'DX')
    standard.model_add_hvac_system(self, 'Ground Source Heat Pumps', ht = 'Electricity', znht = nil, cl = 'Electricity', zones,
                                   zone_equipment_ventilation: false)

  when 'DOAS with water source heat pumps district chilled water with district hot water'
    standard.model_add_hvac_system(self, 'DOAS', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Water Source Heat Pumps', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', zones,
                                   zone_equipment_ventilation: false)

  # ventilation provided by zone fan coil unit in fan coil systems
  when 'Fan coil chiller with boiler'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)

  when 'Fan coil chiller with central air source heat pump'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', zones)

  when 'Fan coil chiller with district hot water'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', zones)

  when 'Fan coil chiller with baseboard electric'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Fan coil chiller with gas unit heaters'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Fan coil chiller with no heat'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones)

  when 'Fan coil air-cooled chiller with boiler'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'Fan coil air-cooled chiller with central air source heat pump'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'Fan coil air-cooled chiller with district hot water'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'Fan coil air-cooled chiller with baseboard electric'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Fan coil air-cooled chiller with gas unit heaters'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Fan coil air-cooled chiller with no heat'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'Fan coil district chilled water with boiler'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', zones)

  when 'Fan coil district chilled water with central air source heat pump'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'AirSourceHeatPump', znht = nil, cl = 'DistrictCooling', zones)

  when 'Fan coil district chilled water with district hot water'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', zones)

  when 'Fan coil district chilled water with baseboard electric'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Fan coil district chilled water with gas unit heaters'
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Fan coil district chilled water with no heat '
    standard.model_add_hvac_system(self, 'Fan Coil', ht = nil, znht = nil, cl = 'DistrictCooling', zones)

  when 'Forced air furnace'
    # includes ventilation, whereas residential forced air furnace does not.
    standard.model_add_hvac_system(self, 'Forced Air Furnace', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Gas unit heaters'
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PTAC with baseboard electric'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'PTAC with baseboard gas boiler'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PTAC with baseboard district hot water'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_zones)

  when 'PTAC with gas unit heaters'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PTAC with electric coil'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = 'Electricity', cl = 'Electricity', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PTAC with gas coil'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = 'NaturalGas', cl = 'Electricity', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PTAC with gas boiler'
    standard.model_add_hvac_system(self, 'PTAC', ht = 'NaturalGas', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard gas boiler' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_only_zones)

  when 'PTAC with central air source heat pump'
    standard.model_add_hvac_system(self, 'PTAC', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard central air source heat pump' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_only_zones)

  when 'PTAC with district hot water'
    standard.model_add_hvac_system(self, 'PTAC', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard district hot water heat' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_only_zones)

  when 'PTAC with no heat'
    standard.model_add_hvac_system(self, 'PTAC', ht = nil, znht = nil, cl = 'Electricity', system_zones)

  when 'PTHP'
    standard.model_add_hvac_system(self, 'PTHP', ht = 'Electricity', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC with baseboard electric'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC with baseboard gas boiler'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC with baseboard district hot water'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC with gas unit heaters'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'Electricity', system_zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC with electric coil'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = 'Electricity', cl = 'Electricity', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC with gas coil'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = 'NaturalGas', cl = 'Electricity', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC with gas boiler'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = 'NaturalGas', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard gas boiler' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC with central air source heat pump'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = 'AirSourceHeatPump', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard central air source heat pump' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC with district hot water'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = 'DistrictHeating', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard district hot water' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC with no heat'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  when 'PSZ-AC district chilled water with baseboard electric'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'DistrictCooling', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC district chilled water with baseboard gas boiler'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'DistrictCooling', system_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC district chilled water with gas unit heaters'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'DistrictCooling', system_zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'PSZ-AC district chilled water with electric coil'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = 'Electricity', cl = 'DistrictCooling', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC district chilled water with gas coil'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = 'NaturalGas', cl = 'DistrictCooling', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC district chilled water with gas boiler'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', system_zones)
    # use 'Baseboard gas boiler' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC district chilled water with central air source heat pump'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = 'AirSourceHeatPump', znht = nil, cl = 'DistrictCooling', system_zones)
    # use 'Baseboard central air source heat pump' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC district chilled water with district hot water'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', system_zones)
    # use 'Baseboard district hot water' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_only_zones)

  when 'PSZ-AC district chilled water with no heat'
    standard.model_add_hvac_system(self, 'PSZ-AC', ht = nil, znht = nil, cl = 'DistrictCooling', cooled_zones)

  when 'PSZ-HP'
    standard.model_add_hvac_system(self, 'PSZ-HP', ht = 'Electricity', znht = nil, cl = 'Electricity', system_zones)
    # use 'Baseboard electric' for heated only zones
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_only_zones)

  # PVAV systems by default use a DX coil for cooling
  when 'PVAV with gas boiler reheat', 'Packaged VAV Air Loop with Boiler' # second enumeration for backwards compatibility with Tenant Star project
    standard.model_add_hvac_system(self, 'PVAV Reheat', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'Electricity', zones)

  when 'PVAV with central air source heat pump reheat'
    standard.model_add_hvac_system(self, 'PVAV Reheat', ht = 'AirSourceHeatPump', znht = 'AirSourceHeatPump', cl = 'Electricity', zones)

  when 'PVAV with district hot water reheat'
    standard.model_add_hvac_system(self, 'PVAV Reheat', ht = 'DistrictHeating', znht = 'DistrictHeating', cl = 'Electricity', zones)

  when 'PVAV with PFP boxes'
    standard.model_add_hvac_system(self, 'PVAV PFP Boxes', ht = 'Electricity', znht = 'Electricity', cl = 'Electricity', zones)

  when 'PVAV with gas heat with electric reheat'
    standard.model_add_hvac_system(self, 'PVAV Reheat', ht = 'Gas', znht = 'Electricity', cl = 'Electricity', zones)

  # all residential systems do not have ventilation
  when 'Residential AC with baseboard electric'
    standard.model_add_hvac_system(self, 'Residential AC', ht = nil, znht = nil, cl = nil, cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Residential AC with baseboard gas boiler'
    standard.model_add_hvac_system(self, 'Residential AC', ht = nil, znht = nil, cl = nil, cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Residential AC with baseboard central air source heat pump'
    standard.model_add_hvac_system(self, 'Residential AC', ht = nil, znht = nil, cl = nil, cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_zones)

  when 'Residential AC with baseboard district hot water'
    standard.model_add_hvac_system(self, 'Residential AC', ht = nil, znht = nil, cl = nil, cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_zones)

  when 'Residential AC with residential forced air furnace'
    standard.model_add_hvac_system(self, 'Residential Forced Air Furnace with AC', ht = nil, znht = nil, cl = nil, zones)

  when 'Residential AC with no heat'
    standard.model_add_hvac_system(self, 'Residential AC', ht = nil, znht = nil, cl = nil, cooled_zones)

  when 'Residential heat pump'
    standard.model_add_hvac_system(self, 'Residential Air Source Heat Pump', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'Residential heat pump with no cooling'
    standard.model_add_hvac_system(self, 'Residential Air Source Heat Pump', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Residential forced air furnace'
    standard.model_add_hvac_system(self, 'Residential Forced Air Furnace', ht = 'NaturalGas', znht = nil, cl = nil, zones)

  when 'VAV chiller with gas boiler reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'Electricity', zones)

  when 'VAV chiller with central air source heat pump reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'AirSourceHeatPump', znht = 'AirSourceHeatPump', cl = 'Electricity', zones)

  when 'VAV chiller with district hot water reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'DistrictHeating', znht = 'DistrictHeating', cl = 'Electricity', zones)

  when 'VAV chiller with PFP boxes'
    standard.model_add_hvac_system(self, 'VAV PFP Boxes', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'Electricity', zones)

  when 'VAV chiller with gas coil reheat'
    standard.model_add_hvac_system(self, 'VAV Gas Reheat', ht = 'NaturalGas', ht = 'NaturalGas', cl = 'Electricity', zones)

  when 'VAV chiller with no reheat with baseboard electric'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'VAV chiller with no reheat with gas unit heaters'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'VAV chiller with no reheat with zone heat pump'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones)
    # Using PTHP to represent zone heat pump to limit to one airloop per thermal zone.
    standard.model_add_hvac_system(self, 'PTHP', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'VAV air-cooled chiller with gas boiler reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'VAV air-cooled chiller with central air source heat pump reheat '
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'AirSourceHeatPump', znht = 'AirSourceHeatPump', cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'VAV air-cooled chiller with district hot water reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'DistrictHeating', znht = 'DistrictHeating', cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'VAV air-cooled chiller with PFP boxes'
    standard.model_add_hvac_system(self, 'VAV PFP Boxes', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'VAV air-cooled chiller with gas coil reheat'
    standard.model_add_hvac_system(self, 'VAV Gas Reheat', ht = 'NaturalGas', ht = 'NaturalGas', cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')

  when 'VAV air-cooled chiller with no reheat with baseboard electric'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'VAV air-cooled chiller with no reheat with gas unit heaters'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'VAV air-cooled chiller with no reheat with zone heat pump'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   chilled_water_loop_cooling_type: 'AirCooled')
    # Using PTHP to represent zone heat pump to limit to one airloop per thermal zone.
    standard.model_add_hvac_system(self, 'PTHP', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'VAV district chilled water with gas boiler reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'DistrictCooling', zones)

  when 'VAV district chilled water with central air source heat pump reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'AirSourceHeatPump', znht = 'AirSourceHeatPump', cl = 'DistrictCooling', zones)

  when 'VAV district chilled water with district hot water reheat'
    standard.model_add_hvac_system(self, 'VAV Reheat', ht = 'DistrictHeating', znht = 'DistrictHeating', cl = 'DistrictCooling', zones)

  when 'VAV district chilled water with PFP boxes'
    standard.model_add_hvac_system(self, 'VAV PFP Boxes', ht = 'NaturalGas', znht = 'NaturalGas', cl = 'DistrictCooling', zones)

  when 'VAV district chilled water with gas coil reheat'
    standard.model_add_hvac_system(self, 'VAV Gas Reheat', ht = 'NaturalGas', ht = 'NaturalGas', cl = 'DistrictCooling', zones)

  when 'VAV district chilled water with no reheat with baseboard electric'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'VAV district chilled water with no reheat with gas unit heaters'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'VAV district chilled water with no reheat with zone heat pump'
    standard.model_add_hvac_system(self, 'VAV No Reheat', ht = 'NaturalGas', znht = nil, cl = 'DistrictCooling', zones)
    # Using PTHP to represent zone heat pump to limit to one airloop per thermal zone.
    standard.model_add_hvac_system(self, 'PTHP', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'VRF'
    standard.model_add_hvac_system(self, 'VRF', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'Water source heat pumps fluid cooler with boiler'
    standard.model_add_hvac_system(self, 'Water Source Heat Pumps', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   heat_pump_loop_cooling_type: 'FluidCooler')

  when 'Water source heat pumps cooling tower with boiler'
    standard.model_add_hvac_system(self, 'Water Source Heat Pumps', ht = 'NaturalGas', znht = nil, cl = 'Electricity', zones,
                                   heat_pump_loop_cooling_type: 'CoolingTower')

  when 'Water source heat pumps with ground source heat pump'
    standard.model_add_hvac_system(self, 'Ground Source Heat Pumps', ht = 'Electricity', znht = nil, cl = 'Electricity', zones)

  when 'Water source heat pumps district chilled water with district hot water'
    standard.model_add_hvac_system(self, 'Water Source Heat Pumps', ht = 'DistrictHeating', znht = nil, cl = 'DistrictCooling', zones)

  when 'Window AC with baseboard electric'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'Electricity', znht = nil, cl = nil, heated_zones)

  when 'Window AC with baseboard gas boiler'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Window AC with baseboard central air source heat pump'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'AirSourceHeatPump', znht = nil, cl = nil, heated_zones)

  when 'Window AC with baseboard district hot water'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)
    standard.model_add_hvac_system(self, 'Baseboards', ht = 'DistrictHeating', znht = nil, cl = nil, heated_zones)

  when 'Window AC with forced air furnace'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)
    standard.model_add_hvac_system(self, 'Forced Air Furnace', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Window AC with unit heaters'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)
    standard.model_add_hvac_system(self, 'Unit Heaters', ht = 'NaturalGas', znht = nil, cl = nil, heated_zones)

  when 'Window AC with no heat'
    standard.model_add_hvac_system(self, 'Window AC', ht = nil, znht = nil, cl = 'Electricity', cooled_zones)

  else
    return false
  end
  return true
end