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-40310 - Section C403.1-General

Current through Register Vol. 24-14, July 15, 2024
C403.1
General.
Mechanical systems and equipment serving heating,
			 cooling, ventilating, and other needs shall comply with this section.
EXCEPTIONS:
1. Energy using equipment used by a manufacturing,
						  industrial or commercial process other than for conditioning spaces or
						  maintaining comfort and amenities for the occupants are exempt from all Section
						  C403 subsections except for Section C403.3.2, Tables C403.3.2 (1) through (16)
						  inclusive, SectiC403.9.2.1, C403.10.3, C403.11.2, and C403.11.3, center and
computer room
HVAC equipment is not coverby this
						  exception.
2.
Data center systems
are exempt from
						  Sections C403.4 and C403.5.
C403.1.1
HVAC total system performance ratio (HVAC TSPR).
For systems
			 serving office (including medical office), retail, library, and education
			 occupancies and buildings, which are subject to the requirements of Section
			 C403.3.5 without exceptions, and the dwelling units and residential common
			 areas within Group R-2 multi-family buildings, the
HVAC total system
			 performance ratio
(
HVAC TSPR
) of the
proposed
			 design
HVAC system shall be greater than or equal to the
HVAC
			 TSPR
of the
standard reference design
as calculated
			 according to Appendix D, Calculation of HVAC Total System Performance Ratio.
EXCEPTIONS:
1. Buildings where the sum of the
conditioned
						  floor area
of office, retail, education, library and multifamily
						  spaces is less than 5,000 square feet.
2. HVAC systems using district heating water, chilled
						  water or steam.
3. HVAC systems connected to a
low-carbon
						  district energy exchange system.
4. HVAC systems not included in Table D601.10.1.
5. HVAC systems with chilled water supplied by
						  absorption chillers, heat recovery chillers, water to water heat pumps, air to
						  water heat pumps, or a combination of air and water cooled chillers on the same
						  chilled water loop.
6. HVAC systems included in Table D601.10.1 with
						  parameters in Table D601.10.2 not identified as applicable to that HVAC system
						  type.
7. HVAC systems served by heating water plants that
						  include air to water or water to water heat pumps.
8. Underfloor air distribution and displacement
						  ventilation HVAC systems.
9. Space conditioning systems that do not include
mechanical cooling
.
10. Alterations to existing buildings that do not
						  substantially replace the entire HVAC system and are not serving initial
						  build-out construction.
11. HVAC systems meeting all the requirements of the
						  standard reference design HVAC system in Table D602.11,
Standard
						  Reference Design
HVAC Systems.
12. Buildings or areas of medical office buildings
						  that comply fully with ASHRAE Standard 170 including, but not limited to,
						  surgical centers, or that are required by other applicable codes or standards
						  to provide 24/7 air handling unit operation.
13. HVAC systems serving the following areas and
						  spaces:
13.1. Laundry rooms.
13.2. Elevator machine rooms.
13.3. Mechanical and electrical rooms.
13.4. Data centers and computer rooms.
13.5. Laboratories with fume hoods.
13.6. Locker rooms with more than two showers.
13.7. Natatoriums and rooms with saunas.
13.8. Restaurants and commercial kitchens with total
						  cooking capacity greater than 100,000 Btu/h.
13.9. Areas of buildings with commercial refrigeration
						  equipment exceeding 100 kW of power input.
13.10. Cafeterias and dining rooms.
C403.1.2
Calculation of heating and
			 cooling loads.
Design loads associated with heating, ventilating and air
			 conditioning of the building shall be determined in accordance with the
			 procedures described in AN-SI/ASHRAE/ACCA Standard 183 or by an
approved
equivalent computational procedure, using the design
			 parameters specified in Chapter 3. Heating and cooling loads shall be adjusted
			 to account for load reductions that are achieved where energy recovery systems
			 are utilized in the HVAC system in accordance with the ASHRAE
HVAC
			 Systems and Equipment Handbook
by an
approved
equivalent computational procedure.
C403.1.3
Data centers.
Data center systems
shall comply with Sections 6 and 8 of
			 ASHRAE Standard 90.4.