ASHRAE-90.1-2022- - Page 107

Extracted Content

Table 6.6.2.2 Mechanical Performance Factors (MPF)

Building Type	Climate Zone	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12	Col13	Col14	Col15	Col16	Col17	Col18	Col19	Col20
Building Type	0A	0B	1A	1B	2A	2B	3A	3B	3C	4A	4B	4C	5A	5B	5C	6A	6B	7	8
Office (small and medium)a	0.72	0.71	0.70	0.70	0.68	0.65	0.71	0.66	0.62	0.69	0.64	0.65	0.72	0.66	0.65	0.74	0.70	0.75	0.77
Office (large)a	0.83	0.83	0.84	0.84	0.79	0.82	0.72	0.84	0.78	0.69	0.80	0.67	0.72	0.75	0.67	0.73	0.73	0.71	0.70
Retail	0.60	0.57	0.50	0.55	0.46	0.46	0.43	0.46	0.38	0.40	0.45	0.48	0.41	0.50	0.47	0.44	0.39	0.40	0.36
Hotel/motel	0.62	0.62	0.63	0.63	0.62	0.68	0.61	0.71	0.73	0.59	0.66	0.65	0.55	0.59	0.68	0.51	0.54	0.47	0.40
Multifamily/ dormitory	0.64	0.63	0.67	0.63	0.65	0.64	0.59	0.68	0.54	0.59	0.57	0.52	0.58	0.53	0.48	0.57	0.53	0.55	0.52
School/education	0.82	0.81	0.80	0.79	0.75	0.72	0.71	0.72	0.68	0.67	0.71	0.65	0.72	0.68	0.60	0.75	0.69	0.72	0.68

a. Office sizes defined in Section L1.1.1.1.

a. All HVAC systems in the building that meet the criteria in Section L1.1.1 shall comply with Section

6.6.2.2. b. All other HVAC systems shall comply with one of the following:

1. HVAC systems shall comply with the applicable requirements in Section 6.5.
2. HVAC systems that only serve the heating, cooling, or ventilating needs of a computer room with IT equipment load greater than 10 kW shall be permitted to comply with ANSI/ASHRAE Standard 90.4, Energy Standard for Data Centers . 6.6.2.2 Criteria. HVAC systems in new buildings, additions, or alterations shall comply with the requirements in Section L2, “Mechanical System Performance Rating Method.” The proposed design total system performance ratio ( TSPRp ) of the HVAC systems using this method shall be greater than or equal to the total system performance ratio of the TSPR reference building design ( TSPRr ) divided by the mechanical performance factor (MPF) when calculated in accordance with the following:

TSPRp - TSPRr /MPF

where TSPR p = proposed TSPR calculated in accordance with Normative Appendix L TSPR r = reference TSPR calculated in accordance with Normative Appendix L MPF = mechanical performance factor from Table 6.6.2.2 based on climate zone and building use type

Where a building has multiple building use types, MPF shall be area weighted as follows:

MPF = ( A 1 × MPF1 + A 2 × MPF2 + … + An × MPF n )/( A 1 + A 2 + … + An )

where MPF1, MPF2, …, MPF n = mechanical performance factors from Table 6.6.2.2 based on climate zone and building use types 1 through n A 1, A 2, …, An = gross conditioned floor areas for building use types 1 through n Informative Note: The Mechanical System Performance Rating Method is a simplified performance trade-off approach for HVAC systems that does not require using the whole- building trade-off approaches in Section 12 or Normative Appendix G. HVAC systems that are allowed to use this approach will not need to comply with all of the prescriptive requirements in Section 6.5. For example, an HVAC system without a required outdoor air economizer can show compliance with Section 6 by demonstrating improved cooling efficiency or reduced fan energy use compared to a reference HVAC system that meets all prescriptive requirements, including outdoor air economizers . This approach does not allow HVAC system efficiency trade-offs with building envelope, plug loads , or lighting systems .

6.7 Submittals 6.7.1 General. Compliance documentation and supplemental information shall be submitted in accordance with Section 4.2.2 of this standard.

6.7.2 Permit Application Documentation (Not Used) 6.7.3 Completion Requirements

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 105