RCT/JDJ/residential associated zones

rct229/rulesets/ashrae9012022/data/ashrae_90_1_lighting_to_hvac_map.json

@@ -0,0 +1,35 @@
+{
+  "AUTOMOTIVE_FACILITY": "OTHER_NON_RESIDENTIAL",
+  "CONVENTION_CENTER": "PUBLIC_ASSEMBLY",
+  "COURTHOUSE": "OTHER_NON_RESIDENTIAL",
+  "DINING_BAR_LOUNGE_LEISURE": "OTHER_NON_RESIDENTIAL",
+  "DINING_CAFETERIA_FAST_FOOD": "OTHER_NON_RESIDENTIAL",
+  "DINING_FAMILY": "OTHER_NON_RESIDENTIAL",
+  "DORMITORY": "RESIDENTIAL",
+  "EXERCISE_CENTER": "OTHER_NON_RESIDENTIAL",
+  "FIRE_STATION": "OTHER_NON_RESIDENTIAL",
+  "GYMNASIUM": "PUBLIC_ASSEMBLY",
+  "HEALTH_CARE_CLINIC": "HOSPITAL",
+  "HOSPITAL": "HOSPITAL",
+  "HOTEL_MOTEL": "RESIDENTIAL",
+  "LIBRARY": "OTHER_NON_RESIDENTIAL",
+  "MANUFACTURING_FACILITY": "OTHER_NON_RESIDENTIAL",
+  "MOTION_PICTURE_THEATER": "PUBLIC_ASSEMBLY",
+  "MULTIFAMILY": "RESIDENTIAL",
+  "MUSEUM": "PUBLIC_ASSEMBLY",
+  "OFFICE": "OTHER_NON_RESIDENTIAL",
+  "PARKING_GARAGE": "HEATED-ONLY_STORAGE",
+  "PENITENTIARY": "OTHER_NON_RESIDENTIAL",
+  "PERFORMING_ARTS_THEATER": "PUBLIC_ASSEMBLY",
+  "POLICE_STATION": "OTHER_NON_RESIDENTIAL",
+  "POST_OFFICE": "OTHER_NON_RESIDENTIAL",
+  "RELIGIOUS_FACILITY": "PUBLIC_ASSEMBLY",
+  "RETAIL": "RETAIL",
+  "SCHOOL_UNIVERSITY": "OTHER_NON_RESIDENTIAL",
+  "SPORTS_ARENA": "PUBLIC_ASSEMBLY",
+  "TOWN_HALL": "OTHER_NON_RESIDENTIAL",
+  "TRANSPORTATION": "OTHER_NON_RESIDENTIAL",
+  "WAREHOUSE": "HEATED-ONLY_STORAGE",
+  "WORKSHOP": "OTHER_NON_RESIDENTIAL",
+  "NONE": "NONE"
+}

rct229/rulesets/ashrae9012022/data/ashrae_90_1_space_lighting_to_hvac_map.json

@@ -0,0 +1,104 @@
+{
+  "ATRIUM_LOW_MEDIUM": "OTHER_UNDETERMINED",
+  "ATRIUM_HIGH": "OTHER_UNDETERMINED",
+  "AUDIENCE_SEATING_AREA_AUDITORIUM": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_EXERCISE_CENTER": "OTHER_NON_RESIDENTIAL",
+  "AUDIENCE_SEATING_AREA_GYMNASIUM": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_MOTION_PICTURE_THEATER": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_PENITENTIARY": "OTHER_NON_RESIDENTIAL",
+  "AUDIENCE_SEATING_AREA_PERFORMING_ARTS_THEATER": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_RELIGIOUS_FACILITY": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_SPORTS_ARENA": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_TRANSPORTATION_FACILITY": "OTHER_NON_RESIDENTIAL",
+  "AUDIENCE_SEATING_AREA_ALL_OTHER": "PUBLIC_ASSEMBLY",
+  "AUDIENCE_SEATING_AREA_CONVENTION_CENTER": "PUBLIC_ASSEMBLY",
+  "BANKING_ACTIVITY_AREA": "OTHER_NON_RESIDENTIAL",
+  "CLASSROOM_LECTURE_HALL_TRAINING_ROOM_PENITENTIARY": "OTHER_NON_RESIDENTIAL",
+  "CLASSROOM_LECTURE_HALL_TRAINING_ROOM_SCHOOL": "OTHER_NON_RESIDENTIAL",
+  "CLASSROOM_LECTURE_HALL_TRAINING_ROOM_ALL_OTHER": "OTHER_NON_RESIDENTIAL",
+  "CONFERENCE_MEETING_MULTIPURPOSE_ROOM": "OTHER_NON_RESIDENTIAL",
+  "CONFINEMENT_CELLS": "OTHER_NON_RESIDENTIAL",
+  "COPY_PRINT_ROOM": "OTHER_UNDETERMINED",
+  "CORRIDOR_FACILITY_FOR_THE_VISUALLY_IMPAIRED": "OTHER_UNDETERMINED",
+  "CORRIDOR_HOSPITAL": "HOSPITAL",
+  "CORRIDOR_MANUFACTURING_FACILITY": "OTHER_NON_RESIDENTIAL",
+  "CORRIDOR_ALL_OTHERS": "OTHER_UNDETERMINED",
+  "COURT_ROOM": "OTHER_NON_RESIDENTIAL",
+  "COMPUTER_ROOM": "OTHER_UNDETERMINED",
+  "DINING_AREA_PENITENTIARY": "OTHER_NON_RESIDENTIAL",
+  "DINING_AREA_FACILITY_FOR_THE_VISUALLY_IMPAIRED": "OTHER_NON_RESIDENTIAL",
+  "DINING_AREA_BAR_LOUNGE_OR_LEISURE_DINING": "OTHER_NON_RESIDENTIAL",
+  "DINING_AREA_CAFETERIA_OR_FAST_FOOD_DINING": "OTHER_NON_RESIDENTIAL",
+  "DINING_AREA_FAMILY_DINING": "OTHER_NON_RESIDENTIAL",
+  "DINING_AREA_ALL_OTHERS": "OTHER_NON_RESIDENTIAL",
+  "ELECTRICAL_MECHANICAL_ROOM": "OTHER_UNDETERMINED",
+  "EMERGENCY_VEHICLE_GARAGE": "HEATED-ONLY_STORAGE",
+  "FOOD_PREPARATION_AREA": "OTHER_NON_RESIDENTIAL",
+  "GUEST_ROOM": "RESIDENTIAL",
+  "JUDGES_CHAMBERS": "OTHER_NON_RESIDENTIAL",
+  "DWELLING_UNIT": "RESIDENTIAL",
+  "LABORATORY_EXCEPT_IN_OR_AS_A_CLASSROOM": "OTHER_NON_RESIDENTIAL",
+  "LAUNDRY_WASHING_AREA": "OTHER_NON_RESIDENTIAL",
+  "LOADING_DOCK_INTERIOR": "HEATED-ONLY_STORAGE",
+  "LOBBY_FACILITY_FOR_THE_VISUALLY_IMPAIRED": "OTHER_NON_RESIDENTIAL",
+  "LOBBY_ELEVATOR": "OTHER_UNDETERMINED",
+  "LOBBY_HOTEL": "OTHER_NON_RESIDENTIAL",
+  "LOBBY_MOTION_PICTURE_THEATER": "PUBLIC_ASSEMBLY",
+  "LOBBY_PERFORMING_ARTS_THEATER": "PUBLIC_ASSEMBLY",
+  "LOBBY_ALL_OTHERS": "OTHER_UNDETERMINED",
+  "LOCKER_ROOM": "OTHER_UNDETERMINED",
+  "LOUNGE_BREAKROOM_HEALTH_CARE_FACILITY": "HOSPITAL",
+  "LOUNGE_BREAKROOM_ALL_OTHERS": "OTHER_NON_RESIDENTIAL",
+  "OFFICE_ENCLOSED": "OTHER_NON_RESIDENTIAL",
+  "OFFICE_OPEN_PLAN": "OTHER_NON_RESIDENTIAL",
+  "PARKING_AREA_INTERIOR": "HEATED-ONLY_STORAGE",
+  "PHARMACY_AREA": "OTHER_NON_RESIDENTIAL",
+  "RESTROOM_FACILITY_FOR_THE_VISUALLY_IMPAIRED": "OTHER_UNDETERMINED",
+  "RESTROOM_ALL_OTHERS": "OTHER_UNDETERMINED",
+  "SALES_AREA": "RETAIL",
+  "SEATING_AREA_GENERAL": "PUBLIC_ASSEMBLY",
+  "STAIRWELL": "OTHER_UNDETERMINED",
+  "STORAGE_ROOM_HOSPITAL": "HOSPITAL",
+  "STORAGE_ROOM_SMALL": "OTHER_UNDETERMINED",
+  "STORAGE_ROOM_LARGE": "OTHER_UNDETERMINED",
+  "VEHICULAR_MAINTENANCE_AREA": "HEATED_ONLY_STORAGE",
+  "ASSISTED_LIVING_FACILITY_CHAPEL": "PUBLIC_ASSEMBLY",
+  "ASSISTED_LIVING_FACILITY_RECREATION_ROOM_COMMON_LIVING_ROOM": "OTHER_NON_RESIDENTIAL",
+  "CONVENTION_CENTER_EXHIBIT_SPACE": "PUBLIC_ASSEMBLY",
+  "DORMITORY_LIVING_QUARTERS": "RESIDENTIAL",
+  "FIRE_STATION_SLEEPING_QUARTERS": "RESIDENTIAL",
+  "GYMNASIUM_FITNESS_CENTER_EXERCISE_AREA": "PUBLIC_ASSEMBLY",
+  "GYMNASIUM_FITNESS_CENTER_PLAYING_AREA": "PUBLIC_ASSEMBLY",
+  "HEALTHCARE_FACILITY_EMERGENCY_ROOM": "HOSPITAL",
+  "HEALTHCARE_FACILITY_EXAM_TREATMENT_ROOM": "HOSPITAL",
+  "HEALTHCARE_FACILITY_NURSERY": "HOSPITAL",
+  "HEALTHCARE_FACILITY_NURSES_STATION": "HOSPITAL",
+  "HEALTHCARE_FACILITY_OPERATING_ROOM": "HOSPITAL",
+  "HEALTHCARE_FACILITY_PATIENT_ROOM": "HOSPITAL",
+  "HEALTHCARE_FACILITY_PHYSICAL_THERAPY_ROOM": "HOSPITAL",
+  "HEALTHCARE_FACILITY_RECOVERY_ROOM": "HOSPITAL",
+  "LIBRARY_READING_AREA": "OTHER_NON_RESIDENTIAL",
+  "LIBRARY_STACKS": "OTHER_NON_RESIDENTIAL",
+  "MANUFACTURING_FACILITY_DETAILED_MANUFACTURING_AREA": "OTHER_NON_RESIDENTIAL",
+  "MANUFACTURING_FACILITY_EQUIPMENTROOM": "OTHER_NON_RESIDENTIAL",
+  "MANUFACTURING_FACILITY_EXTRA_HIGH_BAY_AREA": "OTHER_NON_RESIDENTIAL",
+  "MANUFACTURING_FACILITY_HIGH_BAY_AREA": "OTHER_NON_RESIDENTIAL",
+  "MANUFACTURING_FACILITY_LOW_BAY_AREA": "OTHER_NON_RESIDENTIAL",
+  "MUSEUM_GENERAL_EXHIBITION_AREA": "PUBLIC_ASSEMBLY",
+  "MUSEUM_RESTORATION_ROOM": "PUBLIC_ASSEMBLY",
+  "POST_OFFICE_SORTING_AREA": "OTHER_NON_RESIDENTIAL",
+  "RELIGIOUS_FACILITY_FELLOWSHIP_HALL": "PUBLIC_ASSEMBLY",
+  "RELIGIOUS_FACILITY_WORSHIP_PULPIT_CHOIR_AREA": "PUBLIC_ASSEMBLY",
+  "RETAIL_FACILITIES_DRESSING_FITTING_ROOM": "RETAIL",
+  "RETAIL_FACILITIES_MALL_CONCOURSE": "RETAIL",
+  "SPORTS_ARENA_PLAYING_AREA_CLASS_I_FACILITY": "PUBLIC_ASSEMBLY",
+  "SPORTS_ARENA_PLAYING_AREA_CLASS_II_FACILITY": "PUBLIC_ASSEMBLY",
+  "SPORTS_ARENA_PLAYING_AREA_CLASS_III_FACILITY": "PUBLIC_ASSEMBLY",
+  "SPORTS_ARENA_PLAYING_AREA_CLASS_IV_FACILITY": "PUBLIC_ASSEMBLY",
+  "TRANSPORTATION_FACILITY_BAGGAGE_CAROUSEL_AREA": "OTHER_NON_RESIDENTIAL",
+  "TRANSPORTATION_FACILITY_AIRPORT_CONCOURSE": "OTHER_NON_RESIDENTIAL",
+  "TRANSPORTATION_FACILITY_TICKET_COUNTER": "OTHER_NON_RESIDENTIAL",
+  "WAREHOUSE_STORAGE_AREA_MEDIUM_TO_BULKY_PALLETIZED_ITEMS": "HEATED_ONLY_STORAGE",
+  "WAREHOUSE_STORAGE_AREA_SMALLER_HAND_CARRIED_ITEMS": "HEATED_ONLY_STORAGE",
+  "NONE": "NONE"
+}

rct229/rulesets/ashrae9012022/data_fns/table_lighting_to_hvac_bat_map_fns.py

@@ -0,0 +1,20 @@
+from rct229.rulesets.ashrae9012022.data import data
+from rct229.utils.assertions import assert_
+
+
+def building_lighting_to_hvac_bat(lighting_bat):
+    bat_conversion_table = data["ashrae_90_1_lighting_to_hvac_map"]
+    assert_(
+        lighting_bat in bat_conversion_table,
+        f"Lighting area type {lighting_bat} does not exist in ashrae_90_1_lighting_to_hvac_map",
+    )
+    return bat_conversion_table[lighting_bat]
+
+
+def space_lighting_to_hvac_bat(lighting_bat):
+    bat_conversion_table = data["ashrae_90_1_space_lighting_to_hvac_map"]
+    assert_(
+        lighting_bat in bat_conversion_table,
+        f"Lighting area type {lighting_bat} does not exist in ashrae_90_1_lighting_to_hvac_map",
+    )
+    return bat_conversion_table[lighting_bat]

rct229/rulesets/ashrae9012022/data_fns/table_lighting_to_hvac_bat_map_fns_test.py

@@ -0,0 +1,12 @@
+from rct229.rulesets.ashrae9012022.data_fns.table_lighting_to_hvac_bat_map_fns import (
+    building_lighting_to_hvac_bat,
+    space_lighting_to_hvac_bat,
+)
+
+
+def test__lighting_to_hvac_bat__DORMITORY():
+    assert building_lighting_to_hvac_bat("DORMITORY") == "RESIDENTIAL"
+
+
+def test__space_lighting_to_hvac_bat__ATRIUM_HIGH():
+    assert space_lighting_to_hvac_bat("ATRIUM_HIGH") == "OTHER_UNDETERMINED"

rct229/rulesets/ashrae9012022/ruleset_functions/baseline_system_type_compare.py

@@ -0,0 +1,58 @@
+from typing import Optional, Type
+
+from rct229.rulesets.ashrae9012022.ruleset_functions.baseline_systems.baseline_system_util import (
+    HVAC_SYS,
+    HVAC_SYSTEM_TYPE_DICTIONARY,
+)
+from rct229.utils.assertions import assert_
+
+
+def baseline_system_type_compare(
+    system_type: HVAC_SYS,
+    target_system_type: HVAC_SYS,
+    exact_match: Optional[bool] = True,
+) -> bool:
+    """
+    Parameters
+    ----------
+    system_type: String the enum indicating the hvac system type example: SYS_5 or SYS_8c.
+    This will usually be the value given by the function get_baseline_system_types
+    A None is acceptable and the function will raise RCTException which result in UNDETERMINED outcome.
+
+    target_system_type: String the enum indicating the target system type, will usually be SYS_# (primary baseline
+    system types) without a further number or letter modifier.
+
+    exact_match: Bool TRUE or FALSE.  if exact_match is TRUE, then system_type must match exactly the enum given
+    by target_system_type.  If false, an approximate match will return true.  This would be used in the case where
+    the user wants any hvac system ot type 8, without having to type in 8a, 8b, 8c.  In this case, SYS_8 would be
+    passed to the function and the function would return TRUE for any system 8, regardless of it's 8a, 8b, or 8c
+
+    Returns
+    -------
+    True or False, indicating whether the hvac system type matches the hvac_system_type.
+    """
+
+    # A list of the available target system
+    available_target_system_list = HVAC_SYSTEM_TYPE_DICTIONARY
+    available_system_types = [
+        system
+        for key in HVAC_SYSTEM_TYPE_DICTIONARY
+        for system in HVAC_SYSTEM_TYPE_DICTIONARY[key]
+    ]
+    available_system_types.extend(available_target_system_list)
+
+    assert_(
+        system_type in available_system_types,
+        f"{system_type} does not match any baseline HVAC system type",
+    )
+    assert_(
+        target_system_type in available_target_system_list,
+        f"{target_system_type} does not match any primary "
+        f"baseline HVAC system type",
+    )
+
+    return (
+        system_type == target_system_type
+        if exact_match
+        else system_type in HVAC_SYSTEM_TYPE_DICTIONARY[target_system_type]
+    )

rct229/rulesets/ashrae9012022/ruleset_functions/baseline_systems/baseline_hvac_sub_functions/are_all_terminal_chw_loops_purcahsed_cooling.py

@@ -0,0 +1,49 @@
+from rct229.schema.schema_enums import SchemaEnums
+from rct229.utils.assertions import getattr_
+from rct229.utils.jsonpath_utils import find_all
+from rct229.utils.utility_functions import (
+    find_exactly_one_fluid_loop,
+    find_exactly_one_terminal_unit,
+)
+
+EXTERNAL_FLUID_SOURCE = SchemaEnums.schema_enums["ExternalFluidSourceOptions"]
+FLUID_LOOP = SchemaEnums.schema_enums["FluidLoopOptions"]
+
+
+def are_all_terminal_chw_loops_purchased_cooling(rmd_b, terminal_unit_id_list):
+    """Returns TRUE if the fluid loop associated with the cooling_from_loop associated with each terminal unit is purchased CHW. Returns FALSE if this is not the case.
+    ----------
+    rmd_b : json
+        RMD at RuleSetModelDescription level
+    terminal_unit_id_list : list
+        List of terminal units IDs
+    Returns
+    -------
+    bool
+        True: the fluid loop associated with the cooling_from_loop associated with each terminal unit is purchased CHW.
+        False: otherwise
+    """
+    are_all_terminal_chw_loops_purchased_cooling_flag = True
+
+    # get the list of loop ids if the external fluid source matches to either hot water or steam
+    purchased_cooling_loop_id_list_b = find_all(
+        f'external_fluid_sources[*][?(@.type="{EXTERNAL_FLUID_SOURCE.CHILLED_WATER}")].loop',
+        rmd_b,
+    )
+
+    for terminal_b_id in terminal_unit_id_list:
+        terminal_b = find_exactly_one_terminal_unit(rmd_b, terminal_b_id)
+        cooling_from_loop_id = terminal_b.get("cooling_from_loop")
+        if cooling_from_loop_id:
+            fluid_loop = find_exactly_one_fluid_loop(rmd_b, cooling_from_loop_id)
+            if (
+                getattr_(fluid_loop, "fluid loop", "type") != FLUID_LOOP.COOLING
+                or cooling_from_loop_id not in purchased_cooling_loop_id_list_b
+            ):
+                are_all_terminal_chw_loops_purchased_cooling_flag = False
+                break
+        else:
+            are_all_terminal_chw_loops_purchased_cooling_flag = False
+            break
+
+    return are_all_terminal_chw_loops_purchased_cooling_flag

rct229/rulesets/ashrae9012022/ruleset_functions/baseline_systems/baseline_hvac_sub_functions/are_all_terminal_cool_sources_chilled_water.py

@@ -0,0 +1,25 @@
+from rct229.schema.schema_enums import SchemaEnums
+from rct229.utils.utility_functions import find_exactly_one_terminal_unit
+
+COOLING_SOURCE = SchemaEnums.schema_enums["CoolingSourceOptions"]
+
+
+def are_all_terminal_cool_sources_chilled_water(rmd_b, terminal_unit_id_list):
+    """Returns TRUE if the cool source associated with all terminal units is CHILLED_WATER. It returns FALSE if any terminal unit has a cool source other than CHILLED_WATER.
+    ----------
+    rmd_b : json
+        RMD at RuleSetModelDescription level
+    terminal_unit_id_list : list
+        List of terminal units IDs
+    Returns
+    -------
+    bool
+        True: cool source associated with all terminal units sent to this function is CHILLED_WATER
+        False: any terminal unit has a cool source other than CHILLED_WATER
+    """
+    # all terminal cool sources should be chilled water, false otherwise
+    return all(
+        find_exactly_one_terminal_unit(rmd_b, terminal_b_id).get("cooling_source")
+        == COOLING_SOURCE.CHILLED_WATER
+        for terminal_b_id in terminal_unit_id_list
+    )

rct229/rulesets/ashrae9012022/ruleset_functions/baseline_systems/baseline_hvac_sub_functions/are_all_terminal_cool_sources_none_or_null.py

@@ -0,0 +1,27 @@
+from rct229.schema.schema_enums import SchemaEnums
+from rct229.utils.utility_functions import find_exactly_one_terminal_unit
+
+COOLING_SOURCE = SchemaEnums.schema_enums["CoolingSourceOptions"]
+
+
+def are_all_terminal_cool_sources_none_or_null(rmd_b, terminal_unit_id_list):
+    """Returns TRUE if the cool source associated with all terminal units input to this function are None or Null. It returns FALSE if any terminal unit has a cool source other than None or Null.
+    ----------
+    rmd_b : json
+        RMD at RuleSetModelDescription level
+    terminal_unit_id_list : list
+        List of terminal units IDs
+    Returns
+    -------
+    bool
+        True: the cool source associated with all terminal units input to this function are None or Null
+        False: any terminal unit has a cool source other than None or Null
+    """
+    are_all_terminal_cool_sources_none_or_null_flag = True
+    for terminal_b_id in terminal_unit_id_list:
+        terminal_b = find_exactly_one_terminal_unit(rmd_b, terminal_b_id)
+        if terminal_b.get("cooling_source") not in [None, COOLING_SOURCE.NONE]:
+            are_all_terminal_cool_sources_none_or_null_flag = False
+            break
+
+    return are_all_terminal_cool_sources_none_or_null_flag

rct229/rulesets/ashrae9012022/ruleset_functions/baseline_systems/baseline_hvac_sub_functions/are_all_terminal_fan_configs_parallel.py

@@ -0,0 +1,27 @@
+from rct229.schema.schema_enums import SchemaEnums
+from rct229.utils.utility_functions import find_exactly_one_terminal_unit
+
+TERMINAL_FAN_CONFIGURATION = SchemaEnums.schema_enums["TerminalFanConfigurationOptions"]
+
+
+def are_all_terminal_fan_configs_parallel(rmd_b, terminal_unit_id_list):
+    """Returns TRUE if the fan configuration associated with all terminal units input to this function are parallel.
+    It returns FALSE if any terminal unit has a fan configuration other than parallel.
+
+    ----------
+    rmd_b : json
+        RMD at RuleSetModelDescription level
+    terminal_unit_id_list : list
+        List of terminal units IDs
+    Returns
+    -------
+    bool
+        True: fan configuration associated with all terminal units input to this function are parallel
+        False: any terminal unit has a fan configuration other than parallel
+    """
+    # all terminal's fan configuration should be parallel, and false otherwise.
+    return all(
+        find_exactly_one_terminal_unit(rmd_b, terminal_b_id).get("fan_configuration")
+        == TERMINAL_FAN_CONFIGURATION.PARALLEL
+        for terminal_b_id in terminal_unit_id_list
+    )

rct229/rulesets/ashrae9012022/ruleset_functions/baseline_systems/baseline_hvac_sub_functions/are_all_terminal_fans_null.py

@@ -0,0 +1,24 @@
+from rct229.utils.utility_functions import find_exactly_one_terminal_unit
+
+
+def are_all_terminal_fans_null(rmd_b, terminal_unit_id_list):
+    """Returns TRUE if the fan data element associated with all terminal units input to this function are equal to Null. It returns FALSE if any terminal unit has a fan data element not equal to Null.
+    ----------
+    rmd_b : json
+        RMD at RuleSetModelDescription level
+    terminal_unit_id_list : list
+        List of terminal units IDs
+    Returns
+    -------
+    bool
+        True: fan data element associated with all terminal units input to this function are equal to Null
+        False: any terminal unit has a fan data element not equal to Null.
+    """
+    are_all_terminal_fans_null_flag = True
+    for terminal_b_id in terminal_unit_id_list:
+        terminal_b = find_exactly_one_terminal_unit(rmd_b, terminal_b_id)
+        if terminal_b.get("fan") is not None:
+            are_all_terminal_fans_null_flag = False
+            break
+
+    return are_all_terminal_fans_null_flag