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Rule5-35.md

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Envelope - Rule 5-35

Rule ID: 5-35
Rule Description: The baseline air leakage rate of the building envelope (I75Pa) at a fixed building pressure differential of 0.3 in. of water shall be 1 cfm/ft2. The air leakage rate of the building envelope shall be converted to appropriate units for the simulation program using one of the methods in Section G3.1.1.4.
Rule Assertion: Sum of B-RMD infiltration.infiltration.air_leakage_rate = expected value.
Appendix G Section: Section 5 Envelope
Appendix G Section Reference: Section G3.1-5(h) Building Envelope Modeling Requirements for the Baseline building

Applicability: All required data elements exist for B_RMD
Applicability Checks: None

Manual Check: None
Evaluation Context: Each Data Element
Data Lookup: None
Function Call:

  1. get_surface_conditioning_category()
  2. get_zone_conditioning_category()

Rule Logic:

  • Get surface conditioning category dictionary for B_RMD: scc_dict_b = get_surface_conditioning_category(B_RMD)

  • Get zone conditioning category dictionary for B_RMD: zone_conditioning_category_dict_b = get_zone_conditioning_category(B_RMD)

  • For each zone in the Baseline model: for zone_b in B_RMD...zones:

    • For each surface in zone: for surface_b in zone_b.surfaces:

      • Check if surface is regulated, add zone total area of building envelope to building total: if scc_dict_b[surface_b.id] != "UNREGULATED": building_total_envelope_area += sum(surface.area for surface in zone_b.surfaces)

    • Check if zone is conditioned or semi-heated, add zone infiltration flow rate to building total: if zone_conditioning_category_dict_b[zone.id] in [CONDITIONED RESIDENTIAL, CONDITIONED NON-RESIDENTIAL, CONDITIONED MIXED, SEMI-HEATED]: building_total_air_leakage_rate_b += zone_b.infiltration.infiltration_flow_rate

  • Calculate the required baseline air leakage rate at 75Pa in cfm: target_air_leakage_rate_75pa_b = 1.0 * building_total_envelope_area

Rule Assertion:

  • Case 1: For B_RMD, if the total zone infiltration rate for conditioned and semi-heated zones is equal to the required baseline infiltration rate at 75Pa with a conversion factor of 0.112 as per Section G3.1.1.4: if building_total_air_leakage_rate_b == target_air_leakage_rate_75pa_b * 0.112: PASS

  • Case 2: Else: else: FAIL

Notes:

  1. Update Rule ID from 5-47 to 5-36 on 10/26/2023
  2. Update Rule ID from 5-36 to 5-35 on 12/22/2023

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