ASHRAE-Standard-55 - Page 074
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(This appendix is not part of this standard. It is merely informative and does not contain requirements necessary for conformance to the standard. It has not been processed according to the ANSI requirements for a standard and may contain material that has not been subject to public review or a consensus process. Unresolved objectors on informative material are not offered the right to appeal at ASHRAE or ANSI.)
INFORMATIVE APPENDIX N ADDENDA DESCRIPTION
ANSI/ASHRAE Standard 55-2023 incorporates ANSI/ASHRAE Standard 55-2020 and Addenda a, b, c, d, e, f, g, h, i, j, and k to ANSI/ ASHRAE Standard 55-2020. Table N-1 lists each addendum and describes the way in which the standard is affected by the change. It also lists the ASHRAE and ANSI approval date for each addendum.
Table N-1 Addenda to ANSI/ASHRAE Standard 55-2020
| Addendum | Section(s) Affected | Description of Changes* | ASHRAE/ANSI Approval Dates |
|---|---|---|---|
| a | 3, 5.3.3.4 | Addendum a adds a new method for the assessment of local thermal discomfort with vertical air temperature gradient between the head level and ankle level. | April 30, 2021 |
| b | 5.2.1.4, 5.2.2.2, Table 5-5, 5.3.1.1, 5.3.2.1, Informative Appendices F, G, H | Addendum b changes the upper metabolic rate limit for the standard from 2 to 4. This change aligns the standard with ISO Standard 773 and is motivated by consistent recent research that supports the applicability of Standard 55 at this metabolic level. | Addendum b changes the upper metabolic rate limit for the standard from 2 to 4. This change aligns the standard with ISO Standard 773 and is motivated by consistent recent research that supports the applicability of Standard 55 at this metabolic level. |
| c | 5.3.2.1, Normative Appendix D | Addendum c changes the lower limit of average air speed when using the Elevated Air Speed Comfort Zone Method from 0.2 m/s to 0.1 m/s. | Addendum c changes the lower limit of average air speed when using the Elevated Air Speed Comfort Zone Method from 0.2 m/s to 0.1 m/s. |
| d | 3, 7.3.2(b), C1, C2(h), Tables C-1 and C-2 | Addendum d makes changes to the ERF code. The new code allows the user to calculate ERF and delta mean radiant temperature for an additional body position: horizontal. | October 29, 2021 |
| e | Informative Appendix J | Addendum e changes the paragraph that describes the basis for the calculation of prevailing mean temperature in Section 5.4.2.1. This change eliminates an equation that is easily misused and leaves a functionally equivalent equation that cannot be misused | June 30, 2021 |
| f | 3, 5.2.2.2, Normative Appendix B, Informative Appendix G | Addendum f changes the air speed definition to account for moving occupants. Additionally, activity-generated air speed and clothing insulation adjustment for an active person are now included within the PMV code of Normative Appendix B, in order to align with ISO 7730 and the original intent of the PMV model. | Addendum f changes the air speed definition to account for moving occupants. Additionally, activity-generated air speed and clothing insulation adjustment for an active person are now included within the PMV code of Normative Appendix B, in order to align with ISO 7730 and the original intent of the PMV model. |
| g | 3, Table D-1, D4, | Addendum g makes changes to the definition of the SET temperature and to the SET code to align with international standards | April 29, 2022 |
| h | See note. | Addendum h adds a new definition for “comfort zone” and updates related definitions; removes the concept of a separate elevated airspeed “method” and replaces it with a reference to an “adjustment” to the standard method (includes changes to Normative Appendix A, where a flow chart is added to guide users through the various models that underpin the standard; replaces the word “acceptable” with “satisfactory” throughout the standard; rewrites Informative Appendix H to account for recent changes in the standard and to better explain the concept of comfort zones; and updates the example surveys provided in Informative Appendix L and associated language. (NOTE: The changes in this addendum are too numerous to list here; download Addendum h at www.ashrae.org/addenda. | December 30, 2022 |
| i | 8 | Addendum i updates normative references to updated versions of ASHRAE publications. | April 28, 2023 |
| j | 6.1, 6.2, 6.2.1, 6.2.2, 6.2.3 (new) | Addendum j updates Section 6 of the standard to align with changes in Section 5 of the standard and to clarify aspects of required documentation that were previously confusing. In particular, Section 6 is now split into three sections that provide documentation requirements for Section 5.3 separate from 5.4 and separate from common requirements. Example documentation in Excel format is included as an online supplemental file, which replaces the example form that was in Appendix K. | October 31, 2023 |
| k | Table D-1, D4 | Addendum k modifies the SET code to account for body position. | October 31, 2023 |
- These descriptions may not be complete and are provided for information only.