“Outcome-based Pathway” – The New Mandate for Energy Compliance?

The following addition is being proposed to the International Green Construction Code (IgCC).

 

“The building community needs a better baseline of actual building performance against which to measure progress. More importantly, the application and use of prescriptive criteria must be eliminated in favor of stated performance goals or expected outcomes (although, after setting those goals or outcomes, prescriptive guidance to achieve them can be developed).”  – NIBS

 

SECTION 60X
OUTCOME‐BASED PATHWAY REQUIREMENTS
60X.1 Outcome‐based requirements. Compliance for buildings and their sites to be designed on an outcome
basis shall be determined by actual measurement of all the energy being used once the building and the
energy using elements associated with the building site are in full operation in accordance with Equation 6‐3.
Where a building has multiple occupancy types, the maximum allowable energy use shall be based on total
gross floor area of each occupancy type in relation to the total gross floor area of all occupancy types within
the building. All buildings and their sites utilizing these Outcome‐Based Pathway Requirements shall comply
with the International Energy Conservation Code. Compliance shall be determined based on a determination
of actual energy use in accordance with this section.
Exception: Buildings having one or more uses or occupancies not listed in Table 60X.1 or where a mixed use
building per the International Building Code includes any occupancies not shown in Table 60X.1, shall not be
eligible to demonstrate compliance with this code in accordance with Section 60X.
60X.1.1 zEPI. All outcome‐based designs shall demonstrate a zEPI of not more than 51 as determined in
accordance with Equation 6‐3.
zEPI = 100 (EUIa / EUIr) (Equation 6‐3)
Where:
EUIa = the Actual Annual Energy Use Index for the building and building site expressed
in accordance with Section 60X.1.2 and Equation 6‐4.
EUIr = the Reference Annual Energy Use Index for the building use and occupancy in
Table 60X.1 as adjusted by Section 60X.1.3 where applicable
TABLE 60X.1
REFERENCE ANNUAL ENERGY USE INDEX (EUIr)
Climate Zonea 1A 2A 2B 3A 3B 3B 3C 4A 4B 4C 5A 5B 6A 6B 7 8
Use and Occupancyb Reference EUIr skBtu/sf/yr
Business (B)
Office 154 159 154 151 124 140 137 167 144 152 179 155 190 176 208 282
Bank 154 159 154 151 124 140 137 167 144 152 179 155 190 176 208 282
Medical Office (non
diagnostic)
115 119 115 113 93 104 102 125 108 114 134 116 148 131 156 210
Storage (S‐2)
Distribution/Shipping
Center
105 67 69 66 52 64 55 75 70 66 87 81 104 95 119 186
Mercantile (M)
Grocery/Food Store 448 476 452 484 434 450 473 522 479 514 554 511 592 561 633 758
Assembly (A)
Library (A‐3) 234 232 224 230 193 217 209 254 228 235 275 246 304 277 327 434
Educational (E)
Elementary/middle
school
140 139 134 134 111 128 124 149 132 132 160 141 182 161 193 274
Institutional (I‐2)
Hospital/Inpatient
health
417 422 397 408 394 388 407 425 366 398 425 374 439 394 446 532
a. Climate zones as determined in accordance with by Section C301 of the International Energy Conservation Code.
b. Use and occupancy as determined by Chapter 3 of the International Building Code.
60X.1.2 Actual energy use intensity (EUIa). The actual energy use intensity (EUIa) of the building and
building site shall be expressed in accordance with this section of the code. On‐site renewable energy
generation in excess of the generation requirements of Section 610 may be included in the calculation of
the EUIa.
The EUIa shall be determined in accordance with Equation 6‐4 and Sections 60X.1.2.1.
EUIa = AEUconsumption – AEUrenewable
TCFA (Equation 6‐4)
Where:
EUIa = the energy use intensity of the building and building site
AEU consumption = the annual energy consumed by the building and building site from all forms of
energy defined in Sections 603.3.1 through 603.3.6 and converted to source Btus in accordance
with Sections 602.1.2.2 and 602.1.2.3.
AEU renewable = the annual energy produced by onsite renewable energy systems in excess of the
production required by Section 610 and converted to source Btus by multiplying onsite Btu
production by a factor of 1.
TCFA = the total conditioned floor area of the building as defined in Section C202 of the
International Energy Conservation Code.
60X.1.2.1 Measurement of AEUs. The AEUs shall be determined from metering, utility billing or
other form of measurement in accordance with Section 603.
60X.1.3 Reference energy use intensity (EUIr). The reference energy use intensity shall be determined
utilizing Table 60X.1. The EUIr value from Table 60X.1 shall be adjusted based on the monthly weighted
average percentage of occupied floor area during the 12‐month compliance period as documented in
accordance with 60X.3.2. For buildings with multiple use or occupancy designations in Table 60X.1, the
EUIr shall be adjusted based on the weighted area average of the use or occupancy.
60X.2 Annual direct and indirect CO2e emissions. The emissions associated with the EUIa shall be less than or
equal to the CO2e emissions associated with the CO2e emissions in accordance with the EUIr determined in
Section 60X.1.3. The CO2e emissions calculations for the building and building site shall be determined in
accordance with Sections 60X.2.1 and 60X.2.2 and Equation 6‐5.
CO2ea ≤ (CO2er x zEPI) / 100 (Equation 6‐5)
where:
zEPI = the minimum score as prescribed by Section 60X.1.1
CO2ea = emissions associated with the EUIa of the building as determined in accordance with Section
60X.1.2
CO2er = emissions associated with the EUIr as determined in accordance with Section 60X.1.3
60X.2.1 Onsite electricity. For the purpose of determining compliance with the provisions of Section
60X.2, the CO2e emissions associated with onsite electricity use shall be calculated in accordance with
Section 602.2.1.
60X.2.2 Onsite nonrenewable energy. For the purpose of determining compliance with the provisions of
Section 60X.2, the CO2e emissions associated with onsite non‐renewable energy use shall be calculated in
accordance with Section 602.2.2.
60X.3 Compliance
60X.3.1 Issuance of Temporary Certificate of Occupancy. Upon the satisfaction of the code official of
compliance with all code provision other than those covered in Section 60X, the official shall issue a
Temporary Certificate of Occupancy as authorized in Section 111.3 of the International Building Code.
60X.3.2 Reporting of Energy Use and CO2e Emissions. Within 36 months of issuance of the temporary
certificate of occupancy, the building owner shall provide the AHJ with documentation, in a form
acceptable to the code official and certified by a registered design professional, of a continuous 12‐month
period where the building meets requirements of Sections 60X.1 and 60X.2. The occupancy or use type for
the occupied period utilized in Section 60X.1.3 shall be indicated in the documentation and include, at a
minimum, the time periods and square footage of the building occupied by all building tenants.
60X.3.3 Certificate of Occupancy. Upon compliance with Section 60X.3.2, the building shall be issued a
Certificate of Occupancy.
60X.3.4 Non‐Compliance. Should the building owner fail to comply with Section 60X.3.2, the owner shall
be deemed non‐compliant and be issued a violation.

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