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Rule5-27.md

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Envelope - Rule 5-27

Rule ID: 5-27
Rule Description: Skylight U-factors for residential, non-residential and semi-heated spaces in the baseline model must match the appropriate requirements in Table G3.4-1 through G3.4-8.
Rule Assertion: B-RMR subsurface: U_factor = expected value
Appendix G Section: Section 5 Envelope
Appendix G Section Reference: Section G3.1-5(e) Building Envelope Modeling Requirements for the Baseline building

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

Manual Check: Yes
Evaluation Context: Each Data Element
Data Lookup: Tables G3.4-1 to G3.4-8
Function Call:

  1. get_surface_conditioning_category()
  2. get_opaque_surface_type()
  3. get_building_scc_skylight_roof_ratios_dict()
  4. data_lookup()

Rule Logic:

  • Get RMR climate zone: climate_zone = ASHRAE229.weather.climate_zone

  • Get surface conditioning category dictionary for B_RMR: scc_dictionary_b = get_surface_conditioning_category(B_RMR)

  • Get B_RMR skylight roof ratios dictionary: get_building_scc_skylight_roof_ratios_dict = get_building_scc_skylight_roof_ratios_dict(B_RMR)

  • Check if B_RMR has exterior mixed type skylight: if get_building_scc_skylight_roof_ratios_dict["EXTERIOR MIXED"] > 0:

    • Check if residential and non-residential type skylight U-factor requirements for different skylight-roof-ratio are the same, get skylight U-factor requirements: if ( data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U") == data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "SKYLIGHT", "2.1%+", "ASSEMBLY MAX. U") ) AND ( data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U") == data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "SKYLIGHT", "2.1%+", "ASSEMBLY MAX. U") ) AND ( data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U") == data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U") ): target_u_factor_mixed = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U")

    • Else, request manual review: else: manual_review_flag = TRUE

  • Else, B_RMR does not have exterior mixed type roof surface: else:

    • Get skylight-roof-ratio for residential type roofs: srr_res = get_building_scc_skylight_roof_ratios_dict["EXTERIOR RESIDENTIAL"]

      • If skylight-roof-ratio is greater than 2.0%, get baseline skylight construction requirement: if srr_res > 0.02: target_u_factor_res = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL", "SKYLIGHT", "2.1%+", "ASSEMBLY MAX. U")

      • Else, skylight-roof-ratio is 0% to 2.0%, get baseline skylight construction requirement: else: target_u_factor_res = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL", "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U")

    • Get skylight-roof-ratio for non-residential type roofs: srr_nonres = get_building_scc_skylight_roof_ratios_dict["NON-RESIDENTIAL"]

      • If skylight-roof-ratio is greater than 2.0%, get baseline skylight construction requirement: if srr_nonres > 0.02: target_u_factor_nonres = data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL", "SKYLIGHT", "2.1%+", "ASSEMBLY MAX. U")

      • Else, skylight-roof-ratio is 0% to 2.0%, get baseline skylight construction requirement: else: target_u_factor_nonres = data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL", "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U")

  • Get skylight-roof-ratio for semi-exterior type roofs: srr_semi_exterior = get_building_scc_skylight_roof_ratios_dict["SEMI-EXTERIOR"]

    • If skylight-roof-ratio is greater than 2.0%, get baseline skylight construction requirement: if srr_semi_exterior > 0.02: target_u_factor_semiheated = data_lookup(table_G3_4, climate_zone, "SEMIHEATED, "SKYLIGHT", "2.1%+", "ASSEMBLY MAX. U")

    • Else, skylight-roof-ratio is 0% to 2.0%, get baseline skylight construction requirement: else: target_u_factor_semiheated = data_lookup(table_G3_4, climate_zone, "SEMIHEATED", "SKYLIGHT", "0%-2.0%", "ASSEMBLY MAX. U")

  • For each zone in B_RMR: for zone_b in B_RMR...zones:

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

      • Check if surface is roof with subsurface and is regulated: if ( get_opaque_surface_type(surface_b) == "ROOF" ) AND ( surface_b.subsurfaces ) AND ( scc_dictionary_b[surface_b.id] != "UNREGULATED" ):

        • For each subsurface in roof: for subsurface_b in surface_b.subsurfaces:

          • Check if subsurface is door and glazed area is more than 50% of the total door area, or subsurface is not door: if (( subsurface_b.classification == "DOOR" ) AND ( subsurface_b.glazed_area > subsurface_b.opaque_area )) OR ( subsurface_b.classification != "DOOR" ):

            Rule Assertion - Component:

            • Case 1； For each subsurface, if roof is exterior mixed type and the baseline requirements for residential and non-residential type U-factor for different skylight-roof-ratio are different: if manual_review_flag AND ( scc_dictionary_b[surface_b] == "EXTERIOR MIXED" ): UNDETERMINED

            • Case 2: Else if roof is exterior mixed type and skylight U-factor matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "EXTERIOR MIXED" ) AND ( subsurface_b.u_factor == target_u_factor_mixed ): PASS

            • Case 3: Else if roof is exterior residential type and skylight U-factor matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "EXTERIOR RESIDENTIAL" ) AND ( subsurface_b.u_factor == target_u_factor_res ): PASS

            • Case 4: Else if roof is exterior non-residential type and skylight U-factor matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "EXTERIOR NON-RESIDENTIAL" ) AND ( subsurface_b.u_factor == target_u_factor_nonres ): PASS

            • Case 5: Else if roof is semi-exterior type and skylight U-factor matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "SEMI-EXTERIOR" ) AND ( subsurface_b.u_factor == target_u_factor_semiheated ): PASS

            • Case 6: Else: else: FAIL

Rule Assertion - RMR:

  • Case 1: If any subsurface in B-RMR is ruled as "UNDETERMINED": UNDETERMINED and raise_message "MANUAL REVIEW IS REQUESTED TO VERIFY SKYLIGHT MEETS U-FACTOR REQUIREMENT AS PER TABLE G3.4."

  • Case 2: Else if all subsurface in B-RMR is rules as "PASS": PASS

  • Case 3: Else: FAIL and raise_message "${NUMBER_OF_FAIL_COMPONENTS} of subsurfaces have failed the test.

Notes:

  1. Update Rule ID from 5-37 to 5-27 on 10/26/2023

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