C406.2.2
More
efficient HVAC system performance. All heating and cooling systems shall
meet the minimum requirements of Section C403 and efficiency improvements shall
be referenced to the minimum efficiency requirements listed in the tables in
Section C403.3.2. Where multiple efficiency requirements are listed, equipment
shall meet the seasonal efficiencies including SEER, EER/IEER, IPLV or AFUE.
Equipment that is larger than the maximum capacity range indicated in the
tables in Section C403.3.2 shall utilize the values listed for the largest
capacity equipment for the associated equipment type shown in the table. Where
multiple individual heating or cooling systems serve the project, the
improvement shall be the weighted average improvement based on individual
system capacity.
For occupancies and systems required to comply with Section
C403.1.1, credits are permitted to be achieved by meeting the requirements of
Section C406.2.2.1. Other systems are permitted to achieve credits by meeting
the requirements of either:
1. Section
C406.2.2.2, More efficient HVAC equipment cooling and fan
performance.
2. Section C406.2.2.3,
More efficient HVAC equipment heating performance.
3. Section C406.2.2.4, High performance
dedicated outdoor air system (DOAS).
4. Any combination of Sections C406.2.2.2,
C406.2.2.3, and C406.2.2.4.
In addition, energy credits are permitted to be achieved for
Section C406.2.2.7, Fault detection and diagnostics, where not otherwise
required by Section C403.2.3 or C403.6.10(15).
C406.2.2.1
Improved HVAC TSPR.
For systems required to comply with Section C403.1.1, the HVAC
TSPR shall exceed the minimum requirement by five percent. If
improvement is greater, the credits in Table C406.2(1) are permitted to be
prorated up to a 20 percent improvement.
C406.2.2.2
More efficient HVAC
equipment cooling and fan performance.
No less than 90 percent of the total HVAC capacity serving the
total conditioned floor area of the entire building, building
addition or tenant space in accordance with Section C406.1.1 shall comply with
Sections C406.2.2.2.1 through C406.2.2.2.3. Where individual equipment
efficiencies vary, weigh them based on capacity.
C406.2.2.2.1
HVAC system
selection. Equipment installed shall be types that are listed in the
tables in Section C403.3.2.
C406.2.2.2.2
Cooling equipment
efficiency. Equipment shall exceed the minimum cooling efficiency
requirements listed in the tables in Section C403.3.2 by at least 5 percent.
Where equipment exceeds the minimum annual cooling efficiency and heat
rejection efficiency requirements by more than 5 percent, energy efficiency
credits for cooling shall be determined using Equation 4-15, rounded to the
nearest whole number.
Click
here to view image
Click
here to view image
C406.2.2.2.3
Minimum fan
efficiency. Where fan energy is not included in packaged equipment
rating or it is and the fan size has been increased from the as-rated equipment
condition, fan power or horsepower shall be less than 95 percent of the allowed
fan power in Section C403.8.1.
C406.2.2.3
More efficient HVAC
equipment heating performance. No less than 90 percent of the total HVAC
capacity serving the total
conditioned floor area of the
entire building, building addition or tenant space in accordance with Section
C406.1.1 shall comply with Sections C406.2.2.3.1 through C406.2.2.3.2.
C406.2.2.3.1
HVAC system
selection. Equipment installed shall be types that are listed in the
tables in Section C403.3.2. Electric resistance heating shall be limited to 20
percent of system capacity, with the exception of heat pump supplemental
heating.
C406.2.2.3.2
Heating equipment efficiency. Equipment shall exceed the minimum heating
efficiency requirements of the tables in Section C403.3.2 by at least 5
percent. Where equipment exceeds the minimum annual heating efficiency
requirements by more than 5 percent, energy efficiency credits for heating
shall be determined using Equation 4-16, rounded to the nearest whole number.
Click
here to view image
Click
here to view image
EXCEPTION:
|
In low energy spaces complying with Section C402.1.1
and semi-heated spaces complying with Section C402.1.1.2, no
less than 90 percent of the installed heating capacity is provided by electric
infrared or gas-fired radiant heating equipment for localized heating
applications. Such spaces shall achieve credits for
EEC5.
|
C406.2.2.4
Improved low-carbon district
energy systems (10 percent better). Not less than 90 percent of the
annual service hot water and space heating load, or not less than 90 percent of
the annual service hot water, space heating, and space cooling load shall meet
the criteria of Section C406.2.2.4.1 or C406.2.2.4.2.
Documentation for the low-carbon district system that is
operational prior to the final inspection shall be provided to demonstrate that
the definition as modified in Section C406.2.2.4.1 or C406.2.2.4.2 of
low-carbon district energy exchange system is
satisfied.
C406.2.2.4.1
Improved
low-carbon district energy exchange systems (10 percent better).
Low-carbon district energy exchange systems must demonstrate the following:
1. Forty-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
2. No more than 25 percent of the annual heat
input to the system comes from fossil fuel or electric-resistance
sources.
C406.2.2.4.2
Improved low-carbon district energy heating and cooling or heating only
systems (10 percent better). Distribution losses must be accounted for
and may not exceed 5 percent of the annual load delivered to buildings served
by the system.
Low-carbon district energy heating and cooling or
heating only systems must demonstrate the following:
1. Forty-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
2. No more than 10 percent of
the system annual heat input to the system comes from fossil fuels or
electric-resistance sources. The remaining annual heat input must be provided
using heat pump technology with a minimum annual operating COP of
3.0.
C406.2.2.5
Improved low-carbon district
energy systems (20 percent better). Not less than 90 percent of the
annual service hot water and space heating load, or not less than 90 percent of
the annual service hot water, space heating, and space cooling load shall meet
the criteria of Section C406.2.2.5.1 or C406.2.2.5.2.
Documentation for the low-carbon district system that is
operational prior to the final inspection shall be provided to demonstrate that
the definition as modified in Section C406.2.2.4.1 or C406.2.2.4.2 of
low-carbon district energy exchange system is
satisfied.
C406.2.2.5.1
Improved
low-carbon district energy exchange systems (20 percent better).
Low-carbon district energy exchange systems must demonstrate the following:
1. Fifty 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
2. No more than 10 percent of the annual heat
input to the system comes from fossil fuel or electric-resistance
sources.
C406.2.2.5.2
Improved low-carbon district energy heating and cooling or heating only
systems (20 percent better). Distribution losses must be accounted for
and may not exceed 5 percent of the annual load delivered to buildings served
by the system.
Low-carbon district energy heating and cooling or
heating only systems must demonstrate the following:
1. Fifty 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 10 percent of the annual
heat input to the system comes from fossil fuel or electric-resistance sources;
or
2. No more than 10 percent of
the system annual heat input to the system comes from fossil fuels or
electric-resistance sources. The remaining annual heat input must be provided
using heat pump technology with a minimum annual operating COP of
4.0.
C406.2.2.6
High performance dedicated
outdoor air system (DOAS). No less than 90 percent of the total
conditioned floor area of the whole project, excluding floor area of unoccupied
spaces that do not require ventilation as specified by the
International Mechanical Code, shall be served by DOAS
installed in accordance with Section C403.3.5 with the following adjustments:
1. Minimum heat recovery sensible
effectiveness of 80 percent, calculated in accordance with Section
C403.3.5.1.
2. Where design outdoor
airflow is greater than 500 cfm (250 L/s), the DOAS shall be equipped with an
economizer bypass, damper control, or wheel speed control that is active
between 55°F (13°C) and 75°F (24°C) outdoor air temperature and
minimizes energy recovery or maintains an appropriate DOAS leaving air
temperature when the building is generally in cooling, based either on outdoor
air temperature or a DDC zone-based cooling system reset.
3. DOAS total combined fan power shall be
less than either:
3.1. 0.769 W/cfm (1.55
W/L/s) when calculated in accordance with Section C403.3.5.2.
3.2. Eighty percent of fan power allowance
for a constant volume system when calculated in accordance with Section
C406.8.1.
This option is not available to areas served by systems
utilizing Section C403.2.2.1 exception 5.
C406.2.2.7
Fault detection
and diagnostics system. A project not required to comply with Section
C403.2.3 or C403.6.10(16) shall achieve energy credits for installing a fault
detection and diagnostics system to monitor the HVAC system's performance and
automatically identify faults. The installed system shall comply with items 1
through 6 in Section C403.2.3.