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Rule5-20.md

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Envelope - Rule 5-20

Rule ID: 5-20
Rule Description: Vertical fenestration SHGC shall match the appropriate requirements in Tables G3.4-1 through G3.4-8.
Rule Assertion: Baseline RMD = expected value
Appendix G Section: Section G3.1-5(d) Building Envelope Modeling Requirements for the Baseline building
Appendix G Section Reference: Tables G3.4-1 to G3.4-8

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

Manual Check: None
Evaluation Context: Each Data Element
Data Lookup: Tables G3.4-1 to G3.4-8
Function Call:

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

Rule Logic:

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

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

  • Get window wall ratio ratios dictionary for B_RMD: get_building_scc_skylight_roof_ratios_dict = get_building_scc_skylight_roof_ratios_dict(B_RMD)

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

    • Check if residential and non-residential type vertical fenestration SHGC requirements for different window-wall-ratio are the same, get vertical fenestration SHGC requirements: if ( data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "VERTICAL GLAZING", "10.1%-20.0", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "VERTICAL GLAZING", "20.1%-30.0", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "VERTICAL GLAZING", "30.1%-40.0", "ASSEMBLY MAX. SHGC")) AND ( data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "VERTICAL GLAZING", "10.1%-20.0", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "VERTICAL GLAZING", "20.1%-30.0", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "VERTICAL GLAZING", "30.1%-40.0", "ASSEMBLY MAX. SHGC")) AND ( data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC") == data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL, "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC") ): target_shgc_mixed = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL, "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC")

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

  • Else, B_RMD does not have exterior mixed type wall surface: else:

    • Get window-wall-ratio for residential type walls: wwr_res = get_building_scc_skylight_roof_ratios_dict["EXTERIOR RESIDENTIAL"]

      • If window-wall-ratio is between 0% to 10%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_res > 0.0% ) AND ( wwr_res <= 10.0% ): target_shgc_res = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL", "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC")

      • Else if window-wall-ratio is between 10% to 20%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_res > 10.0% ) AND ( wwr_res <= 20.0% ): target_shgc_res = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL", "VERTICAL GLAZING", "10.1%-20.0%", "ASSEMBLY MAX. SHGC")

      • Else if window-wall-ratio is between 20% to 30%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_res > 20.0% ) AND ( wwr_res <= 30.0% ): target_shgc_res = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL", "VERTICAL GLAZING", "20.1%-30.0%", "ASSEMBLY MAX. SHGC")

      • Else, window-wall-ratio is between 30% to 40%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_res > 30.0% ) AND ( wwr_res <= 40.0% ): target_shgc_res = data_lookup(table_G3_4, climate_zone, "RESIDENTIAL", "VERTICAL GLAZING", "30.1%-40.0%", "ASSEMBLY MAX. SHGC")

    • Get window-wall-ratio for non-residential type walls: wwr_nonres = get_building_scc_skylight_roof_ratios_dict["EXTERIOR NON-RESIDENTIAL"]

      • If window-wall-ratio is between 0% to 10%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_nonres > 0.0% ) AND ( wwr_nonres <= 10.0% ): target_shgc_nonres = data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL", "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC")

      • Else if window-wall-ratio is between 10% to 20%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_nonres > 10.0% ) AND ( wwr_nonres <= 20.0% ): target_shgc_nonres = data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL", "VERTICAL GLAZING", "10.1%-20.0%", "ASSEMBLY MAX. SHGC")

      • Else if window-wall-ratio is between 20% to 30%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_nonres > 20.0% ) AND ( wwr_nonres <= 30.0% ): target_shgc_nonres = data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL", "VERTICAL GLAZING", "20.1%-30.0%", "ASSEMBLY MAX. SHGC")

      • Else, window-wall-ratio is between 30% to 40%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_nonres > 30.0% ) AND ( wwr_nonres <= 40.0% ): target_shgc_nonres = data_lookup(table_G3_4, climate_zone, "NON-RESIDENTIAL", "VERTICAL GLAZING", "30.1%-40.0%", "ASSEMBLY MAX. SHGC")

    • Get window-wall-ratio for semi-heated type walls: wwr_semiheated = get_building_scc_skylight_roof_ratios_dict["SEMI-EXTERIOR"]

      • If window-wall-ratio is between 0% to 10%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_semiheated > 0.0% ) AND ( wwr_semiheated <= 10.0% ): target_shgc_semiheated = data_lookup(table_G3_4, climate_zone, "SEMIHEATED", "VERTICAL GLAZING", "0%-10.0%", "ASSEMBLY MAX. SHGC")

      • Else if window-wall-ratio is between 10% to 20%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_semiheated > 10.0% ) AND ( wwr_semiheated <= 20.0% ): target_shgc_semiheated = data_lookup(table_G3_4, climate_zone, "SEMIHEATED", "VERTICAL GLAZING", "10.1%-20.0%", "ASSEMBLY MAX. SHGC")

      • Else if window-wall-ratio is between 20% to 30%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_semiheated > 20.0% ) AND ( wwr_semiheated <= 30.0% ): target_shgc_semiheated = data_lookup(table_G3_4, climate_zone, "SEMIHEATED", "VERTICAL GLAZING", "20.1%-30.0%", "ASSEMBLY MAX. SHGC")

      • Else, window-wall-ratio is between 30% to 40%, get baseline vertical fenestration construction SHGC requirement: if ( wwr_semiheated > 30.0% ) AND ( wwr_semiheated <= 40.0% ): target_shgc_semiheated = data_lookup(table_G3_4, climate_zone, "SEMIHEATED", "VERTICAL GLAZING", "30.1%-40.0%", "ASSEMBLY MAX. SHGC")

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

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

      • Check if surface is above-grade wall with subsurface and is regulated: if ( get_opaque_surface_type(surface_b) == "ABOVE-GRADE WALL" ) AND ( surface_b.subsurfaces ) AND ( scc_dictionary_b[surface_b.id] != "UNREGULATED" ):

        • For each subsurface in wall: 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 that is vertical fenestration, if wall is exterior mixed type and the baseline requirements for residential and non-residential type SHGC for different window-wall-ratio are different: if manual_review_flag AND ( scc_dictionary_b[surface_b] == "EXTERIOR MIXED" ): UNDETERMINED

            • Case 2: Else if wall is exterior mixed type and vertical fenestration SHGC matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "EXTERIOR MIXED" ) AND ( subsurface_b.solar_heat_gain_coefficient == target_shgc_mixed ): PASS

              • Conservative comparison less equal: else if (AHJ_RA_compare) AND ( scc_dictionary_b[surface_b] == "EXTERIOR MIXED" ) AND ( subsurface_b.solar_heat_gain_coefficient <= target_shgc_mixed ): PASS

            • Case 3: Else if wall is exterior residential type and vertical fenestration SHGC matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "EXTERIOR RESIDENTIAL" ) AND ( subsurface_b.solar_heat_gain_coefficient == target_shgc_res ): PASS

              • Conservative comparison less equal: else if (AHJ_RA_compare) AND ( scc_dictionary_b[surface_b] == "EXTERIOR RESIDENTIAL" ) AND ( subsurface_b.solar_heat_gain_coefficient <= target_shgc_res ): PASS

            • Case 4: Else if wall is exterior non-residential type and vertical fenestration SHGC matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "EXTERIOR NON-RESIDENTIAL" ) AND ( subsurface_b.solar_heat_gain_coefficient == target_shgc_nonres ): PASS

              • Conservative comparison less equal: else if (AHJ_RA_compare) AND ( scc_dictionary_b[surface_b] == "EXTERIOR NON-RESIDENTIAL" ) AND ( subsurface_b.solar_heat_gain_coefficient <= target_shgc_nonres ): PASS

            • Case 5: Else if wall is semi-exterior type and skylight SHGC matches Table G3.4 requirement: else if ( scc_dictionary_b[surface_b] == "SEMI-EXTERIOR" ) AND ( subsurface_b.solar_heat_gain_coefficient == target_shgc_semiheated ): PASS

              • Conservative comparison less equal: else if (AHJ_RA_compare) AND ( scc_dictionary_b[surface_b] == "SEMI-EXTERIOR" ) AND ( subsurface_b.solar_heat_gain_coefficient <= target_shgc_semiheated ): PASS

            • Case 6: Else: else: FAIL and NUMBER_OF_FAIL_COMPONENTS++

Rule Assertion - RMD:

  • Case 1: If any subsurface in B-RMD is ruled as "UNDETERMINED": UNDETERMINED and raise_message "MANUAL REVIEW IS REQUESTED TO VERIFY VERTICAL FENESTRATION MEETS SHGC REQUIREMENT AS PER TABLE G3.4."

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

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

Notes:

  1. Future improvement on this RDS: "One improvement that may be made to both 5-26 and 5-37 to reduce occurance of "undetermined" outcome is to check whether "mixed" fenestration would affect the WWR bracket for either residential or non-residential. Currently, the indeterminate outcome is produced if the U-factor in Tables G3.4 differs for residential vs non-residential and WWR bracket. However, if area or "mixed" fenestration is small enough to not result in a change of WWR bracket for either residential or non-residential, the rule can produce PASS or FAIL outcome instead of UNDETERMINED." This would require changes in get_rmi_scc_window_wall_ratios() function to return areas for each surface conditioning category instead of just percentages. Similarly for Rule-5-24, 5-37 and 5-38.
  2. Update Rule ID from 5-26 to 5-20 on 10/26/2023

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