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ASHRAE STD 55

Thermal Environmental Conditions for Human Occupancy

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Organization: ASHRAE
Publication Date: 30 September 2020
Status: inactive
Page Count: 7
scope:

FOREWORD

Addendum e includes a bug fix to the shortwave solar calculation method explained in Section C1 and the corresponding consequential edits to the prescriptive tables in Section 5.3.2.2.1. The previous method discounted the contribution of diffuse solar radiation by using an incorrect formula for attributing horizontal diffuse radiation. At low angles of solar altitude, this change will increase the shortwave mean radiant temperature as compared to the previous version.

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

Document History

April 30, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD 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. Recent studies found that the...
April 30, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum b to Standard 55-2020 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...
April 30, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum c to Standard 55-2020 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. The change is to avoid the step...
April 28, 2021
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
January 29, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum g to Standard 55-2017 revises Figure 5.3.2C to be consistent with the language of Section 5.3.3.1, where both a met condition and clo condition are provided. The original version...
January 29, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum h to Standard 55-2017 updates normative references to updated versions of ASHRAE publications and also replaces the normative reference to the ASHRAE Thermal Comfort Tool. The...
October 15, 2020
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
ASHRAE STD 55
September 30, 2020
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum e includes a bug fix to the shortwave solar calculation method explained in Section C1 and the corresponding consequential edits to the prescriptive tables in Section 5.3.2.2.1....
September 1, 2020
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum f removes the prohibition against applying the adaptive model described in Section 5.4 for occupant-controlled naturally conditioned spaces in spaces that have an air conditioning...
July 31, 2020
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
July 10, 2020
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
June 26, 2020
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
January 1, 2020
Thermal Environmental Conditions for Human Occupancy
The environmental factors addressed in this standard are temperature, thermal radiation, humidity, and air speed; the personal factors are those of activity and clothing. It is intended that all of...
May 31, 2019
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum b updates the computer code for calculation of PMV-PPD using the JavaScript language to ease use of the code in modern software applications. The updated code also includes errata...
January 29, 2019
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
October 31, 2017
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum a adds a new method for the avoidance of the draft risk at the ankle region. Currently, the standard does not provide guidance for assessing ankle draft. The new method applies to...
July 18, 2017
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
April 3, 2017
Thermal Environmental Conditions for Human Occupancy
FOREWORD This addendum simplifies Normative Appendix A, “Methods for Determining Operative Temperature,” to be a single procedure for calculating operative temperature. Case 1 is removed because it...
January 1, 2017
Thermal Environmental Conditions for Human Occupancy
The environmental factors addressed in this standard are temperature, thermal radiation, humidity, and air speed; the personal factors are those of activity and clothing. It is intended that all of...
September 30, 2016
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
April 7, 2016
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
February 23, 2016
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
September 30, 2015
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
July 8, 2015
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
May 29, 2015
Thermal Environmental Conditions for Human Occupancy
FOREWORD Addendum b to Standard 55-2013 changed the still-air threshold from 0.15 to 0.2 m/s (30 to 40 fpm) to align the compliance paths that previously had differing definitions of "still air."...
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