ANSI/ASHRAE Addendum d to ANSI/ASHRAE Standard 55-2017

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ANSI/ASHRAE Addendum d to ANSI/ASHRAE Standard 55-2017

Thermal Environmental Conditions for

Human Occupancy

Approved by ASHRAE and the American National Standards Institute on July 31, 2020.

This addendum was approved by a Standing Standard Project Committee (SSPC) for which the Standards Committee has established a documented program for regular publication of addenda or revisions, including procedures for timely, documented, consensus action on requests for change to any part of the standard. Instructions for how to submit a change can be found on the ASHRAE? website ().

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? 2020 ASHRAE

ISSN 1041-2336

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print or digAitSalHfoRrmAEisSntoatnpdeirnmgittSetdawndithaorudt PArSoHjeRcAtEC'sopmriomr iwttrietteen55permission. Cognizant TC: 2.1, Physiology and Human Environment SPLS Liaison: Karl L. Peterman

Abhijeet Pande*, Chair David Heinzerling*, Vice-Chair/Webmaster Josh Eddy*, Secretary Peter F. Alspach* Edward A. Arens* Robert Bean* Richard de Dear Thomas B. Hartman*

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Essam E. Khalil* Dolaana Khovalyg* Mikhail Koupriyanov*

Baizhan Li Rodrigo Mora* Francis J. Offermann*

Gwelen Paliaga Zaccary A. Poots* Lawrence J. Schoen*

Peter Simmonds Aaron R. Smith Priyam Tewari

John G. Williams*

* Denotes members of voting status when the document was approved for publication

Drury B. Crawley, Chair Rick M. Heiden, Vice Chair Els Baert Charles S. Barnaby Robert B. Burkhead Thomas E. Cappellin Douglas D. Fick Walter T. Grondzik Susanna S. Hanson Jonathan Humble

ASHRAE STANDARDS COMMITTEE 2020?2021

Srinivas Katipamula Gerald J. Kettler Essam E. Khalil Malcolm D. Knight Jay A. Kohler Larry Kouma Cesar L. Lim James D. Lutz Karl L. Peterman Erick A. Phelps

Connor Barbaree, Senior Manager of Standards

David Robin Lawrence J. Schoen

Steven C. Sill Richard T. Swierczyna

Christian R. Taber Russell C. Tharp

Theresa A. Weston Craig P. Wray

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SPECIAL NOTE This American National Standard (ANS) is a national voluntary consensus Standard developed under the auspices of ASHRAE. Consensus is defined by the American National Standards Institute (ANSI), of which ASHRAE is a member and which has approved this Standard as an ANS, as "substantial agreement reached by directly and materially affected interest categories. This signifies the concurrence of more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution." Compliance with this Standard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation.

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? ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

(This foreword 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.)

FOREWORD

Addendum d removes the Graphical Comfort Zone Method (Section 5.3.1) from the standard and replaces it with example graphics using the Analytical Comfort Zone Method (Section 5.3.2) and the Elevated Air Speed Comfort Zone Method (Section 5.3.3). All references to the graphical method have been removed, and section headings have been updated.

Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and strikethrough (for deletions) unless the instructions specifically mention some other means of indicating the changes.

Addendum d to Standard 55-2017

Modify Section 5.3 as shown.

5.3 Method for Determining Acceptable Thermal Environment in Occupied Spaces. Section 5.3 is permitted to be used to determine the requirements for thermal comfort in all occupied spaces within the scope of this standard.

Acceptable thermal environments shall be determined using one of the three two methods shown in Table 5.3.1 and any applicable requirements of Sections 5.3.45.3.3 and 5.3.55.3.4.

Informative Note: Average air speed and average air temperature have precise definitions in this standard. See Section 3 for all defined terms.

5.3.1 Graphic Comfort Zone Method

5.3.1.1 Applicability. Use of this method shall be limited to representative occupants with metabolic rates between 1.0 and 1.3 met and clothing insulation Icl between 0.5 and 1.0 clo who are not exposed to direct-beam solar radiation. Average air speed Va greater than 0.2 m/s (40 fpm) requires the use of Section 5.3.3.

The Graphic Comfort Zone is limited to a humidity ratio at or below 0.012 kg?H2O/kg dry air (0.012 lb?H2O/lb dry air), which corresponds to a water vapor pressure of 1.910 kPa (0.277 psi) at standard pressure or a dew-point temperature tdp of 16.8?C (62.2?F).

5.3.1.2 Methodology. Figure 5.3.1 specifies the comfort zone for environments that meet the above criteria. Two zones are shown--one for 0.5 clo of clothing insulation Icl and one for 1.0 clo of insulation.

Comfort zones for intermediate values of clothing insulation Icl shall be determined by linear interpolation between the limits for 0.5 and 1.0 clo using the following relationships:

tmin, Icl = [(Icl ? 0.5 clo) tmin, 1.0 clo + (1.0 clo ? Icl) tmin, 0.5clo]/0.5 clo tmax, Icl = [(Icl ? 0.5 clo) tmax, 1.0 clo + (1.0 clo ? Icl) tmax, 0.5clo]/0.5 clo

where

tmin, Icl

= lower operative temperature to limit for clothing insulation Icl

tmax, Icl

= upper operative temperature to limit for clothing insulation Icl

Icl

= thermal insulation of the clothing in question, clo

Average air speeds Va greater than 0.2 m/s (40 fpm) increase the lower and upper operative temperature to limit for the comfort zone in accordance with Section 5.3.3.

5.3.25.3.1 Analytical Comfort Zone Method

5.3.2.15.3.1.1 Applicability. It is permissible to apply the method in this section to all

spaces within the scope of this standard where the occupants have activity levels that result in

average metabolic rates between 1.0 and 2.0 met. Average air speeds Va greater than 0.20 m/s (40 fpm) require the use of Section 5.3.35.3.2.

5.3.2.25.3.1.2 Methodology. The computer code3 in Normative Appendix B is to be used

with this standard. Compliance is achieved if ?0.5 < PMV < +0.5. Alternative methods are per-

mitted. If any other method is used, it is the user's responsibility to verify and document that

ANSI/ASHRAE Addendum d to ANSI/ASHRAE Standard 55-2017

1

? ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

(a)

(b)

Figure 5.3.1 Graphic the criteria specified

Comfort Zone Method: Acceptable range of operative temperature

in Section 5.3.1 (1.0 met < 1.3; 0.5 < clo < 1.0)--(a) I-P and (b) SI.

to

and

humidity

for

spaces

that

meet

2

ANSI/ASHRAE Addendum d to ANSI/ASHRAE Standard 55-2017

? ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

Table 5.3.1 Applicability of Methods for Determining Acceptable Thermal Environments in Occupied Spaces

Average Air Speed,

m/s (fpm)

Humidity Ratio

met

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