ASHRAE Standard 90.4 2022

$91.54

ASHRAE Standard 90.4-2022 — Energy Standard for Data Centers (ANSI Approved)

Published By	Publication Date	Number of Pages
ASHRAE	2022	62

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Category: ASHRAE

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Description

ANSI/ASHRAE Standard 90.4 offers a framework for the energy-efficient design of data centers, with special consideration given to their unique load requirements as compared to other buildings. Standard 90.4 was developed under the guiding principle that data centers are mission-critical facilities, and careful attention must be paid to the potential impacts made by the standard’s requirements. This philosophy continues to guide successive editions, while acknowledging energy-efficiency breakthroughs in the industry. Standard 90.4 establishes the minimum energy efficiency requirements of data centers for design, construction, and operation and maintenance, and use of on-site or off-site renewable energy resources. The standard was developed to be code-intended, similar to Standard 90.1, and Standard 90.4 references Standard 90.1 for building envelope, service water heating, lighting, and other equipment criteria. The newly revised 2022 edition of the standard arrives with significant changes: Additional options for mechanical load component calculations A further reduction to the maximum ELC values required for compliance The elimination of incoming service segment from ELC calculation in recognition that designers must already account for public utility transformers and feeders in most projects New ELC segment calculation breakpoints of 25%, 50%, 75%, and 100% design load to make ELC and MLC congruent A new methodology for applying a credit to combined MLC and ELC for the deployment of onsite renewable energy Specific language to give credit for recovered heat shared with non-data-center spaces

PDF Catalog

PDF Pages	PDF Title
1	ANSI/ASHRAE Standard 90.4-2022
3	Contents
4	1. Purpose 2. Scope 2.1 This standard applies to
5	2.2 The provisions of this standard do not apply to 2.3 Where specifically noted in this standard, certain other buildings or elements of buildings shall be exempt. 2.4 This standard shall not be used to circumvent any safety, health, or environmental requirements. 3. Definitions 3.1 General. Certain terms, abbreviations, and acronyms are defined in this section for the purposes of this standard. When the tense or plurality of the term differs from the defined term, the defined term still applies. These definitions are applic… 3.2 Definitions
9	4. Administration and Enforcement 4.1 General
10	4.2 Compliance
11	5. Building Envelope 5.1 General 5.2 Compliance Paths 6. Heating, Ventilating, and Air Conditioning 6.1 General
12	6.2 Compliance Paths 6.3 Simplified/Small Building Option (Not Used) 6.4 Mandatory Provisions 6.5 Maximum Annualized Mechanical Load Component (Annualized MLC). Annualized MLC shall be calculated using Equation 6.5. The resulting value shall be less than or equal to the value in Table 6.5.
14	6.6 Submittals
15	6.7 Minimum Efficiency Tables (Not Used) 7. Service Water Heating 7.1 General 7.2 Compliance Paths 8. Power 8.1 General
16	8.2 Compliance Paths 8.3 Simplified/Small Building Option (Not Used) 8.4 Mandatory Provisions
18	8.5 Maximum Design Electrical Loss Component (Design ELC) for Designs Involving Electrical Systems Only. Design ELC shall be calculated in accordance with Section 8.4 and shall be less than or equal to the values shown in Table 8.5 or Table 8.6. 8.6 Maximum Design Electrical Loss Component (Design ELC) for Designs Involving Both Electrical and Mechanical Systems. Design ELC shall be calculated in accordance with Section 8.4 and shall be combined with the annualized MLC in accordance with Sec…
19	8.7 Submittals 8.8 Product Information (Not Used) 9. Lighting 9.1 General 9.2 Compliance Paths 10. Other Equipment 10.1 General 10.2 Compliance Paths 11. Alternative Compliance Method 11.1 General
20	11.2 Compliance. Compliance with Section 11 shall be demonstrated by complying with all of the following conditions: 11.3 Use of Shared Systems. Where existing or proposed mechanical and/or electrical systems are intended to routinely support the data center and other spaces (i.e., spaces that do or do not meet the definition of a data center), the data center or d…
22	12. Normative References
23	Informative Appendix A: Informative References
28	Informative Appendix B: Sample Submittal Forms
34	Informative Appendix C: Tools For Illustrating Compliance
42	C1. Examples: UPS Segment of design ELC Calculations
45	C2. Examples: Distribution Segment of Design ELC Calculations
47	C3. Sample Spreadsheet Format Calculation of Total ELC
52	Informative Appendix D: Additional Guidance on Telephone Exchanges
53	Informative Appendix E: Addenda Description Information
54	Annex 1: Reference Standard Reproduction Annex—ASHRAE/IES Standard 90.1-2022