Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-40703 - Section C407.3-Performance-based compliance

Current through Register Vol. 24-14, July 15, 2024
C407.3
Performance-based compliance.
Compliance with this section
			 requires compliance with ASHRAE Standard 90.1 Appendix G, Performance Rating
			 Method, in accordance with Standard 90.1 Section 4.2.1 with the following
			 modifications:
1. The mandatory requirements
			 of the Washington State Energy Code are required to be met, instead of those of
			 Section G1.2.1a of ANSI/ ASHRAE/IESNA 90.1.
2. Compliance with Section C407 requires
			 meeting both a regulated site energy target and a total site energy reduction
			 target in accordance with the following:
2.1.
			 Regulated site energy target. The regulated site energy target is focused on
			 regulated load energy efficiency, thus shall be met only via regulated load
			 savings without consideration of the contribution of on-site or off-site
			 renewable energy or unregulated load savings. Adjustments to the PCI, to
			 account for the contribution of renewable energy found in ANSI/ASHRAE/IESNA
			 90.1 Section 4.2.1.1 shall not be used. References to energy cost in Section
			 4.2.1.1 and Appendix G shall be replaced by site energy use. Heating or cooling
			 energy provided by a district energy system may utilize coefficient of
			 performance (COP) ratios acceptable to the
code official
for
			 the respective district energy sources. The building performance factors in
			 Table 4.2.1.1 of ANSI/ASHRAE/IESNA 90.1 shall be replaced with those in Table
			 C407.3(2).
2.2. Total site energy
			 target. The total site energy performance target shall be met including the
			 contributions of on-site or off-site renewable energy as described in Section
			 C411.2 as well as the contributions of improvements in unregulated loads as
			 allowed by Section C407.3.4. The annual on-site and off-site renewable energy
			 production (as adjusted by the factors in Table C411.2.1) shall be subtracted
			 from the proposed building annual site energy use. Compliance with the site
			 energy performance target requires that the proposed building site energy
			 use/baseline building site energy use is less than or equal to the site energy
			 performance target from Table C407.3(3).
3. Documentation requirements in Section
			 G1.3.2.d shall be replaced by a list showing compliance with the mandatory
			 provisions of Table C407.2.
4.
			 Forms demonstrating compliance with Appendix G developed by the U.S. Department
			 of Energy shall be completed and submitted to the
code
			 official
. The forms are available at
			 energycodes.gov/ashrae-standard-901-performance-based-compliance-form.
5. References to yet-to-be-designed future
			 building components in the Proposed Building Performance column of Table G3.1
			 shall be modified to reference the corresponding sections of the Washington
			 State Energy Code in lieu of the requirements of ANSI/ASHRAE/IESNA 90.1 in the
			 following sections of the table:
5.1. No. 1,
			 Design Model, subclause c.
5.2. No.
			 6, Lighting, subclause c.
5.3. No.
			 11, Service Water Heating System, subclause c.
5.4. No. 12, Receptacle and Other Loads,
			 subclause b.
6. HVAC
			 systems, subclauses c and d of Table G3.1, shall meet the following
			 requirements:
6.1. For yet-to-be-designed
			 systems in office, retail, library, education, and multifamily buildings and
			 occupancies subject to the TSPR requirements of Section C403.1.1, the system
			 type and efficiency parameters in the proposed model shall meet but not exceed
			 those shown in Table D602.11 Standard Reference Design HVAC Systems.
6.2. For all other buildings and occupancies,
			 the system type shall be the same as the system modeled in the baseline design
			 and shall comply with but not exceed the requirements of Section C403 in lieu
			 of ANSI/ASHRAE/IESNA 90.1.
6.3. For
			 HVAC systems serving future tenant spaces, where the current building permit
			 applies to only a portion of an HVAC system, and future components will receive
			 HVAC services from systems included in the current building permit, those
			 future components shall be modeled as the type required to complete the HVAC
			 system portions under the current permit and shall meet but not exceed the
			 requirements found in Section C403.
7. The requirements for proposed and baseline
			 building lighting system shall be modified in accordance with Addendum af to
			 ANSI/ ASHRAE/IESNA 90.1.
8. Energy
			 modeler qualifications. The energy analyst in responsible charge of the Section
			 C407 submittal shall meet at least one of the following:
8.1. ASHRAE Building Energy Modeling
			 Professional (BEMP) certification.
8.2. Association of Energy Engineer's
			 Building Energy Simulation Analyst (BESA) certification.
8.3. Successful completion of at least five
			 projects modeled following any version of ANSI/ASHRAE/IESNA 90.1 Appendix G
			 within the last three years that were reviewed and approved by a
code
			 official
or rating authority.
C407.3.1
Limits on nonmandatory
			 measures.
The Proposed Total UA of the proposed building shall be no
			 more than 20 percent higher than the Allowed Total UA as defined in Section
			 C402.1.5.
C407.3.2
On-site
			 and off-site renewable energy accounting for use with Appendix G.
Qualifying on-site and off-site renewable energy delivered or credited to the
			 building project to comply with Section C407.3 item 2.2 shall meet the
			 requirements of Section C411.2.
C407.3.3
Low-carbon district energy use
			 with Appendix G.
Qualifying
low-carbon district heating and
			 cooling or heating only systems
and
low-carbon district energy
			 exchange system
s shall meet the requirements of Section C407.3.3.1 or
			 C407.3.3.2, as applicable.
C407.3.3.1
Utilization of low-carbon district heating and cooling or heating only
			 systems.
Applicable if heating and cooling or heating only is provided
			 to the
proposed building
from a
low-carbon district
			 heating and cooling or heating only system
that is fully operational
			 prior to the final inspection. Proposed model shall account for all on-site
			 HVAC and service hot water related equipment, such as circulation pump energy
			 and heat-exchanger efficiency.
1. The
			 following modifications shall be applied to Appendix G of ANSI/ASHRAE/IESNA
			 90.1 in addition to what is described in Section C407.3:
1.1. For low-carbon district heating and
			 cooling systems, strike the text of Sections G3.1.1.1, G3.1.1.2, G3.1.1.3.1,
			 G3.1.1.3.3, and G3.1.1.3.4. Baseline system shall be selected based on
			 unmodified versions of Tables G3.1.1-3 and G3.1.1-4, comparing energy use to
			 determine compliance.
1.2. For
			 low-carbon district heating only systems, strike the text of Sections G3.1.1.1,
			 G3.1.1.3.1, and G3.1.1.3.4. Baseline system shall be selected based on
			 unmodified versions of Tables G3.1.1-3 and G3.1.1-4, with carbon emission
			 factors from Table C407.3(1).
2. Any heating or cooling energy provided by
			 the
low-carbon district heating and cooling or heating only
			 system
shall utilize a calculated energy use reduction factor
			 acceptable to the
code official
to account for energy use
			 reduction from those end uses.
3.
			 Energy "credit" for any waste/recoverable heat exported to the
low-carbon district heating and cooling or heating only
			 systems
shall be accounted for in the proposed design by multiplying
			 the quantity of heat exported by the appropriate seasonal utilization factor in
			 Items 3.1 and 3.2 below. This energy "credit" is subtracted from the total
			 proposed design energy use calculated in accordance with ASHRAE 90.1 Section
			 4.2.1.1.
3.1. Fifty percent of the waste heat
			 exported to the
low-carbon district heating and cooling or heating only
			 systems
during the months of October through December and January
			 through March.
3.2. Twenty-five
			 percent of the waste heat exported to the
low-carbon district heating
			 and cooling or heating only systems
during the months of April through
			 September.
EXCEPTION:
Waste heat exported from the building to the
low-carbon district heating and cooling or heating only system
shall not be subtracted from the proposed design energy use if they are already
						  accounted for in the calculation of energy use from the district heating or
						  cooling plant as part of the
district energy efficiency factor
as part of the district energy efficiency factor.
Documentation for the low-carbon district system that is
				operational prior to the final inspection shall be provided to demonstrate the
				following:
1. Distribution losses must
			 be accounted for and may not exceed 10 percent of the annual load delivered to
			 buildings served by the system.
2.
			 Twenty-five percent of the annual district-system-net-load-met (sum of heating
			 and cooling energy provided to attached buildings) comes from heat recovery
			 between connected buildings, waste heat or renewable energy resources and no
			 more than 25 percent of the annual heat input to the system comes from fossil
			 fuel or electric-resistance sources, or not more than 10 percent of the system
			 annual heat input to the system comes from fossil fuel or electric-resistance
			 sources.
C407.3.3.2
Utilization of low-carbon
			 district energy exchange systems.
Applicable if heating or cooling is provided to the
proposed building
from a
low-carbon district energy
				exchange system
that is fully operational prior to the final
				inspection. Proposed model shall account for all on-site HVAC and service hot
				water related equipment, such as circulation pump energy and heat-exchanger
				efficiency.
1. The following
			 modifications shall be applied to Appendix G of ANSI/ASHRAE/IESNA 90.1 in
			 addition to what is described in Section C407.3:
1.1. Strike the text of Sections G3.1.1.1,
			 G3.1.1.2, G3.1.1.3, G3.1.1.3.1, G3.1.1.3.2, G3.1.1.3.3, and G3.1.1.3.4.
			 Baseline system shall be selected based on unmodified versions of Tables
			 G3.1.1-3 and G3.1.1-4.
2.
			 Any heating or cooling energy provided by a low-carbon district energy exchange
			 system shall utilize a calculated energy use reduction factor acceptable to the
code official
to account for the reduction in the proposed
			 model.
3. Energy use "credit" for
			 any waste/recoverable heating exported to the
low-carbon district
			 energy exchange system
shall be accounted for in the proposed design
			 by multiplying the quantity of heat exported by the appropriate seasonal
			 utilization factor in Items 3.1 and 3.2 below. This energy use "credit" is
			 subtracted from the total proposed design energy use calculated in accordance
			 with ASHRAE 90.1 Section 4.2.1.1.
3.1. Fifty
			 percent of the waste heat exported to the
low-carbon district energy
			 exchange system
during the months of October through December and
			 January through March.
3.2.
			 Twenty-five percent of the waste heat exported to the
low-carbon
			 district energy exchange system
during the months of April through
			 September.
EXCEPTION:
Waste heat exported from the building to the
low-carbon district heating and cooling or heating only system
shall not be subtracted from the proposed design energy use if they are already
						  accounted for in the calculation of energy use from the district heating or
						  cooling plant as a part of the
district energy efficiency
						  factor
as a part of the district energy efficiency factor.
Documentation for the low-carbon district system that is
				operational prior to the final inspection shall be provided to demonstrate that
				the definition of
low-carbon district energy exchange system
is satisfied.
C407.3.4
Credit for improvements in
			 unregulated loads when using Appendix G.
When calculating savings for
			 site energy targets in accordance with Section C407.3 item 2.2, but not when
			 calculating savings for emissions targets in accordance with Section C407.3
			 item 2.1, differences in the simulation of unregulated loads and equipment
			 modeled in the baseline building design from those in the
proposed
			 design
shall be approved by the
code official
based
			 on documentation that the equipment installed in the
proposed
			 design
represents a significant verifiable departure from documented
			 current conventional practice. All unregulated equipment for which savings is
			 claimed must be installed by the time of final inspection. The burden of this
			 documentation is to demonstrate that accepted conventional practice would
			 result in baseline building equipment different from that installed in the
proposed design
. Occupancy and occupancy schedules shall not
			 be changed.