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 28, 2023
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
December 30, 2022
Thermal Environmental Conditions for Human Occupancy
PURPOSE
The purpose of this standard is to specify the combinations of indoor thermal environmental factors and personal factors that will produce satisfactory thermal environmental conditions to...
April 29, 2022
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
April 21, 2022
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
October 29, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD
Addendum d to Standard 55-2020 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....
July 7, 2021
Thermal Environmental Conditions for Human Occupancy
A description is not available for this item.
June 30, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD
Addendum e to Standard 55-2020 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...
June 30, 2021
Thermal Environmental Conditions for Human Occupancy
FOREWORD
Addendum f to Standard 55-2020 changes the air speed definition to account for moving occupants. Additionally, activity-generated air speed and clothing insulation adjustment for an active...
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 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...
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...
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.