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-40622 - Section C406.2.2-HVAC measures

Current through Register Vol. 24-14, July 15, 2024
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.