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Rule19-24.md

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Airside System – Rule 19-24

Mandatory Rule: True
Schema Version: 0.0.24
Rule ID: 19-24

Rule Description: Schedules for HVAC fans that provide outdoor air for ventilation shall run continuously whenever spaces are occupied in the proposed design.
Rule Assertion: Options are Pass/Fail/NOT_APPLICABLE
Appendix G Section: Section G3.1-4 Schedules for the proposed building excluding exception #1 and Section G3.1.2.4.
Appendix G Section Reference: None
Data Lookup: None
Evaluation Context: Evaluate each HeatingVentilatingAirConditioningSystem

Applicability Checks:

  1. This rule does not apply when no heating and/or cooling system is to be installed, and a heating or cooling system is being simulated only to meet the requirements described in Section G3.1-10 HVAC Systems proposed column c and d.

Function Call:

  1. get_proposed_hvac_modeled_with_virtual_heating()
  2. get_proposed_hvac_modeled_with_virtual_cooling()

Manual Check: None

Rule Logic: Applicability Check 1:

  • Call function to get list of inapplicable HVAC systems due to virtual cooling being modeled in the proposed per G3.1-10 d : inapplicable_HVAC_systems_cooling_list_p = get_proposed_hvac_modeled_with_virtual_cooling(U_RMI,P_RMI)
  • Call function to get list of inapplicable HVAC systems due to virtual heating being modeled in the proposed per G3.1-10 c:inapplicable_HVAC_systems_heating_list_p = get_proposed_hvac_modeled_with_virtual_heating(U_RMI,P_RMI) There may be duplicates in the following list of inapplicable hvac systems but it is not impactful
  • Combine list of inapplicable hvac systems: inapplicable_HVAC_systems_list_p = inapplicable_HVAC_systems_cooling_list_p + inapplicable_HVAC_systems_heating_list_p
  • For each HeatingVentilationAirconditioningSystem in the P_RMI check if this check is applicable: for each hvac_p in P_RMI..HeatingVentilatingAirConditioningSystem:

    • Check if hvac_p is not in the list of inapplicable systems, if it is not found then carry on with rule logic, if found then the rule outcome is NOT_APPLICABLE for this HVAC system, : if hvac_p not in inapplicable_HVAC_systems_list_p:

      • Get fan operation during occupied periods: operation_during_occupied_p = hvac_p.fan_system.operation_during_occupied
      • Get minimum_outdoor_airflow: minimum_outdoor_airflow_p = hvac_p.fan_system.minimum_outdoor_airflow

      Rule Assertion:

      • Case 1: If the fan system operation during occupied periods is continuous and the minimum OA is greater than 0 in the P_RMI: if operation_during_occupied_p == “CONTINUOUS” and minimum_outdoor_airflow_p >0 : PASS
      • Case 2: else if, fan system operation during occupied periods is cycling and the minimum OA equals 0 in the P_RMI: elif: operation_during_occupied_p == “CYCLING” and minimum_outdoor_airflow_p == 0 : PASS
      • Case 3: Else: Else: FAIL

Notes/Questions:

  1. Updated the Rule ID from 19-27 to 19-24 on 04/17/2023

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