3.8 HVAC Primary Systems

This section covers the building descriptors for the primary HVAC systems. The baseline building HVAC system may or may not have a primary system. See Table 3.8-1 for a summary of the properties of the baseline building primary system. More detail is provided in subsequent sections.

Table 3.8-1: Summary of Baseline Primary HVAC Properties

	Cooling			Heating
System	Appli-cability	Chiller Type and Number	Chilled Water Pumping System	Appli-cability	Hot Water Pumping System
1 PTAC		Electric chillers shall be used in the baseline building design. The baseline building design’s chiller plant shall be modeled with chillers having the number and type as indicated in Section 3.8.2, as a function of building peak cooling load.	The baseline building design pump power shall be 22 W/gpm. Chilled-water systems with a cooling capacity of 300 tons or more shall be modeled as primary/secondary systems with variable-speed drives on the secondary pumping loop. Chilled-water pumps in systems serving less than 300 tons cooling capacity shall be modeled as a primary/secondary systems with secondary pump riding the pump curve.	✔	The pumping system shall be modeled as primary-only with continuous variable flow. Hot-water systems serving 120,000 ft² or more shall be modeled with variable-speed drives, and systems serving less than 120,000 ft² shall be modeled as riding the pump curve
2 PTHP
3 PSZ-AC				✔
4 PSZ-HP
5 PVAV				✔
6 PVAV / PFP
7 VAV	✔			✔
8 VAV / PFP	✔
9 HV Furnace
10 HV Electric
11 SZ-VAV	✔			✔
12 SZ-CV-HW	✔			✔
13 SZ-CV-ER	✔

90.1-2019

Table 79. Summary of Baseline Primary HVAC Properties

System	Cooling Primary System Applicability	Heating Primary System Applicability
1 PTAC		x
2 PTHP
3 PSZ-AC
4 PSZ-HP
5 PVAV		x
6 PVAV / PFP
7 VAV	x	x
8 VAV / PFP	x
9 HV Furnace
10 HV Electric
11 SZ-VAV	x	x
12 SZ-CV-HW	x	x
13 SZ-CV-ER	x