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Rule19-27.md

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Airside System - Rule 19-27

Schema Version: 0.0.24
Mandatory Rule: True
Rule ID: 19-27
Rule Description: HVAC fans shall remain on during unoccupied hours in spaces that have health and safety mandated minimum ventilation requirements during unoccupied hours in the baseline design.
Rule Assertion: Options are Pass/Fail/NOT_APPLICABLE
Appendix G Section: Section G3.1-4 Schedules exception #2 for the proposed building and Section G3.1.2.4
Appendix G Section Reference: None
Data Lookup: None

Evaluation Context: Evaluate each HeatingVentilationAirAconditioningSystem data table

Applicability Checks:

  1. Applies to all HVAC systems that serve zones that have health and safety mandated minimum ventilation requirements during unoccupied hours.

Function Call:

  1. get_hvac_systems_serving_zone_health_safety_vent_reqs()

Manual Check: None

Rule Logic:
Applicability Check 1:

  • Get list of hvac systems that are likely to serve zones that have health and safety mandated minimum ventilation requirements during unoccupied hours: applicable_hvac_systems_list_b = get_hvac_systems_serving_zone_health_safety_vent_reqs(B_RMD)
  • For each hvac_b in applicable_hvac_systems_list_b: for each hvac_b in applicable_hvac_systems_list_b:
    • Get fan operation during unoccupied periods: operation_during_unoccupied_b = hvac_b.fan_system.operation_during_unoccupied
    • Get minimum_outdoor_airflow: minimum_outdoor_airflow_b = hvac_b.fan_system.minimum_outdoor_airflow
      Rule Assertion:
    • Case 1: For each applicable hvac system, if fan system operation during unoccupied periods is continuous in the B_RMD: if operation_during_unoccupied_b == “CONTINUOUS” and minimum_outdoor_airflow_b > 0: PASS
    • Case 2: Else, for each applicable fan system,:Else: FAIL and raise_message "<insert hvac_p.id> SERVES ZONE(S) THAT APPEAR LIKELY TO HAVE HEALTH AND SAFETY MANDATED MINIMUM VENTILATION REQUIREMENTS DURING UNOCCUPIED HOURS AND THEREFORE (IF THE HVAC SYSTEM SUPPLIES OA CFM) MAY WARRANT CONTINUOUS OPERATION DURING UNOCCUPIED HOURS PER SECTION G3.1-4 SCHEDULES EXCEPTION #2 FOR THE BASELINE BUILDING AND PER SECTION G3.1.2.4."

Notes/Questions:

  1. Updated the Rule ID from 19-30 to 19-27 on 04/17/2023

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