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-80500 - Appendix D-Calculation of HVAC total system performance ratio

Current through Register Vol. 24-14, July 15, 2024
D101
Scope.
This appendix establishes criteria for demonstrating
			 compliance using the
HVAC total system performance ratio (HVAC
			 TSPR)
for systems serving office (including medical offices), retail,
			 library and education occupancies and buildings, which are subject to the
			 requirements of Section C403.3.5 without exceptions, and
dwelling
			 units
and common areas within multifamily buildings. Those HVAC
			 systems shall comply with Section C403 and this appendix as required by Section
			 C403.1.1.
D101.1
Core and Shell/Initial
			 Build-Out, and Future System Construction Analysis.
Where the
building
permit applies to only a
				portion of the
HVAC system
in a
building
and
				the remaining components will be designed under a future
building
permit or were previously installed, the future or
				previously installed components shall be modeled as follows:
1. Where the HVAC zones that do not include
			 HVAC systems in the current permit will be or are served by independent
			 systems, then the block including those zones shall not be included in the
			 model.
2. Where the HVAC zones that
			 do not include complete HVAC systems in the permit are intended to receive HVAC
			 services from systems in the permit, their proposed zonal systems shall be
			 modeled with equipment that meets, but does not exceed, the requirements of
			 Section C403.
3. Where the zone
			 equipment in the permit receives HVAC services from previously installed
			 systems that are not in the permit, the previously installed systems shall be
			 modeled with equipment matching the certified value of what is installed or
			 equipment that meets the requirements of Section C403.
4. Where the central plant heating and
			 cooling equipment is completely replaced and HVAC zones with existing systems
			 receive HVAC services from systems in the permit, their proposed zonal systems
			 shall be modeled with equipment that meets, but does not exceed, the
			 requirements of Section C403.
Informative Notes
:
1. Examples of HVAC systems that are intended to
						  receive HVAC services from systems in the permit include future zonal water
						  source heat pumps that will receive loop water that is heated by a boiler or
						  cooled by a cooling tower included in the permit, any system that will receive
						  outdoor ventilation air from a dedicated outdoor air system included in the
						  permit, and future zone terminal units that will be connected to a central VAV
						  system included in the permit.
2. An initial build-out with heating coils served from
						  a previously installed system with a high-efficiency condensing boiler would
						  use the installed efficiency if it exceeded the current requirements. If the
						  installed boiler had a lower efficiency than the current requirements, the
						  current requirement would be used.
3. A partial central plant upgrade (e.g., chiller, but
						  not boiler replacement) cannot use this method.