Skip to content

Latest commit

 

History

History
42 lines (31 loc) · 2.95 KB

4-3.md

File metadata and controls

42 lines (31 loc) · 2.95 KB

Airside System – Rule 4-3

Schema Version: 0.0.23 Rule ID: 4-3

Rule Description: Schedules for HVAC fans that provide outdoor air for ventilation shall run continuously whenever spaces are occupied.
Rule Assertion: P-RMD = expected value
Appendix G Section: Section G3.1-4 Schedules for the proposed building excluding exception #1.
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_RMD,P_RMD)
  • 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_RMD,P_RMD) 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_RMD check if this check is applicable: for each hvac_p in P_RMD..HeatingVentilatingAirConditioningSystem:

    • Check if hvac_p is not in the list of inapplicable systems, if it is not found then set applicability flag to true: if hvac_p not in inapplicable_HVAC_systems_list_p: rule_applicability_flag = TRUE

    • If rule_applicability_flag = TRUE for hvac_p: if rule_applicability_flag == TRUE:

      • Get fan operation during occupied periods: operation_during_occupied_p = hvac_p.fan_systems[0].operation_during_occupied
      • Get minimum_outdoor_airflow: minimum_outdoor_airflow_p = hvac_p.fan_systems[0].minimum_outdoor_airflow

      Rule Assertion:

      • Case 1: For each applicable hvac system, if fan system operation during occupied periods is continuous and the minimum OA is greater than 0 in the P_RMD: 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_RMD: else if operation_during_occupied_p == “CYCLING” and minimum_outdoor_airflow_p == 0 : PASS
      • Case 3: Else: Else: FAIL

Back