is_baseline_system_9.md

is_baseline_system_9

Description: Get either Sys-9, Sys-9b, or Not_Sys_9 string output which indicates whether the HVAC system is ASHRAE 90.1 2019 Appendix G system 9 (Heating and Ventilation) or system 9b (system 9 with purchased heating).

Inputs:

• B-RMI: To evaluate if the hvac system is modeled as either Sys-9, Sys-9b, or Not_Sys_9 in the B_RMI.
• hvac_b.id: The id of the hvac system to evaluate.
• terminal_unit_id_list: list of terminal unit IDs associated with the HVAC system to be evaluated. These are sent to this function from the master get_baseline_system_types function.
• zone_id_list: list of zone IDs associated with the HVAC system to be evaluated. These are sent to this function from the master get_baseline_system_types function.

Returns:

• is_baseline_system_9: The function returns either Sys-9, Sys-9b, or Not_Sys_9 string output which indicates whether the HVAC system is ASHRAE 90.1 2019 Appendix G system 9 (Heating and Ventilation) or system 9b (system 9 with purchased heating).

Function Call:

1. is_hvac_sys_cooling_type_none_or_non_mechanical()
2. is_hvac_sys_fan_sys_CV()
3. is_hvac_sys_heating_type_furnace()
4. are_all_terminal_heat_sources_none_or_null()
5. are_all_terminal_cool_sources_none_or_null()
6. are_all_terminal_fans_null()
7. are_all_terminal_types_CAV()
8. does_each_zone_have_only_one_terminal()
9. does_hvac_system_serve_single_zone()
10. is_baseline_system_9b()

Logic:

• Create an object associated with the hvac system: hvac_b = hvac_b.id
• Set is_baseline_system_9 = Not_Sys_9: is_baseline_system_9 = "Not_Sys_9"
• Check if the system is system 9b, else carry on with logic: if is_baseline_system_9b(B_RMI, hvac_b.id,terminal_unit_id_list,zone_id_list) == TRUE: is_baseline_system_9 = "SYS-9b"
• Else: Else:
  • Check that there is no preheat system, if there is none then carry on: if(hvac_b.preheat_system) == Null or hvac_b.preheat_system.heating_system_type = "NONE" :
    • Check if fansystem is constant volume, if yes then carry on: if is_hvac_sys_fan_sys_CV(B_RMI, hvac_b.id) == TRUE:
      • Check if the hvac system serves a single zone and that the zone only has one terminal unit: if does_hvac_system_serve_single_zone(B_RMI, zone_id_list) == TRUE AND does_each_zone_have_only_one_terminal(B_RMI, zone_id_list) == TRUE:
        • Check that the data elements associated with the terminal unit align with system 9: if are_all_terminal_heat_sources_none_or_null(B_RMI, terminal_unit_id_list) == TRUE AND are_all_terminal_cool_sources_none_or_null(B_RMI, terminal_unit_id_list) == TRUE And are_all_terminal_fans_null(B_RMI, terminal_unit_id_list) == TRUE AND are_all_terminal_types_CAV(B_RMI, terminal_unit_id_list) == TRUE:
          • if coolingsystem is None and the heating type is a furnace then Sys-9: if is_hvac_sys_cooling_type_none_or_non_mechanical(B_RMI, hvac_b.id) == TRUE AND is_hvac_sys_heating_type_furnace(B_RMI, terminal_unit_id_list) == TRUE: is_baseline_system_9 = "Sys-9"

Returns is_baseline_system_9

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