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 systems 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:
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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.
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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.