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ASHRAE Standard 55 2023

ASHRAE Standard 55 2023

$90.46

ASHRAE Standard 55-2023 — Thermal Environmental Conditions for Human Occupancy (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2023 76
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ASHRAE Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces. The 2023 edition of ANSI/ASHRAE Standard 55 incorporates eleven published addenda to the 2020 edition. This edition includes a new method for the assessment of local thermal discomfort with vertical air temperature gradient between the head level and ankle level. The standard now has wider applicability, covering metabolic rates up to 4 from 2. Calculation methods have been consolidated and simplified to two methods, standard and adaptive, and a new flowchart provides guidance on when to use each calculation method. Finally, documentation requirements in the standard have been overhauled with additions, clarifications, and simplifications, along with a new example spreadsheet compliance form to replace the previous form.

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PDF Pages PDF Title
1 ANSI/ASHRAE Standard 55-2023
3 Contents
4 Foreword
1. Purpose
2. Scope
2.1 The environmental factors addressed in this standard are temperature, thermal radiation, humidity, and air speed; the personal factors are those of activity and clothing.
2.2 It is intended that all of the criteria in this standard be applied together, as comfort in the indoor environment is complex and responds to the interaction of all of the factors that are addressed herein.
2.3 This standard specifies thermal environmental conditions acceptable for healthy adults at atmospheric pressure equivalent to altitudes up to 3000 m (10,000 ft) in indoor spaces designed for human occupancy for periods not less than 15 minutes.
2.4 This standard does not address such nonthermal environmental factors as air quality, acoustics, illumination, or other physical, chemical, or biological space contaminants that may affect comfort or health.
2.5 This standard shall not be used to override any safety, health, or critical process requirements.
3. Definitions
7 4. General Requirements
4.1 Where information is required to be identified in this standard, it shall be documented in accordance with and in addition to the requirements in Section 6.
4.2 Identify all of the space types to which the standard is being applied and any locations within a space to which it is not applied.
4.3 For each space type, at least one representative occupant shall be identified. If any known set of occupants is excluded from consideration then these excluded occupants shall be identified.
4.4 For each representative occupant, the metabolic rate M in mets and the insulation Icl in clo shall be determined.
4.5 The thermal environment required for comfort is determined in accordance with Section 5 of this standard.
5. Conditions That Provide Thermal Comfort
5.1 General Requirements. Section 5 of this standard shall be used to determine the acceptable thermal environment for each representative occupant of a space. Section 5.2 is used to determine representative occupant characteristics.
8 5.2 Method for Determining Occupant Characteristics
10 5.3 Determining Satisfactory Thermal Environment in Occupied Spaces
20 5.4 Determining Acceptable Thermal Conditions in Occupant-Controlled Naturally Conditioned Spaces (Adaptive Model)
21 6. Design Compliance
6.1 Design. Building systems (i.e., combinations of mechanical systems, control systems, and thermal enclosures) shall be designed to maintain occupied spaces at thermal conditions that provide thermal comfort in accordance with one of the methods in…
22 6.2 Documentation. The method and design conditions appropriate for the intended use of the building shall be selected and documented as specified in Sections 6.2.1, 6.2.2, and 6.2.3.
23 7. Evaluation of Comfort in Existing Buildings
7.1 Introduction. Evaluation of comfort in existing buildings is not a requirement of this standard. When such evaluation is otherwise required (e.g., by code or another standard) use one of the following methods:
7.2 Criteria for Comfort in Existing Buildings
24 7.3 Measurement Methods
25 7.4 Evaluation Methods
26 8. References
27 Normative Appendix A: Operative Temperature and Procedure for Section 5.3
A1. Methods for Determining Operative Temperature
A2. Procedure for Determining Satisfactory Thermal Environment in Occupied Spaces per Section 5.3
28 Normative Appendix B: Computer Program for Calculation of Predicted Mean Vote (PMV)
30 Normative Appendix C: Procedure for Calculating Comfort Impact of Solar Gain on Occupants
C1. Calculation Procedure
31 C2. Inputs to Calculation Procedure
34 C3. Computer Program for Calculating Comfort Impact of Solar Gain on Occupants
37 C4. Computer Code Validation Table
38 Normative Appendix D: Procedure for Evaluating Cooling Effect of Elevated Air Speed Using Standard Effective Temperature (SET)
D1. Calculation Overview
D2. Calculation Procedure
D3. Validation Table for Set Calculation
39 D4. Computer Program for Calculation of Set
44 Informative Appendix E: Conditions That Provide Thermal Comfort
E1. Introduction
E2. Thermal Comfort Factors
E3. Variation Among Occupants
E4. Temporal Variation
E5. Local Thermal Discomfort
E6. Variation in Activity Level
45 E7. Naturally Conditioned Spaces
E8. Space Design for Occupants in Thermal Transition
E8.1 Problem. People arriving in buildings have different activity levels, body temperatures, and skin wetness from those who have been indoors longer, and they may experience discomfort during the transition. These transitions occur in outdoor-to-in…
46 E8.2 Design Approach for Cooling Transition. Translating these environmental conditions into design, transition zones should be able to provide sufficient elevated air movement within the space that an occupantā€™s travel through it is comfortable th…
47 Informative Appendix F: Use of Metabolic Rate Data
48 Informative Appendix G: Clothing Insulation
50 Informative Appendix H: Comfort Zones Defining Satisfactory Thermal Conditions in Occupied Space
H1. Introduction
H2. Comfort Zone Boundaries
51 H3. humidity Limits to the Comfort Zone
52 Informative Appendix I: Local Discomfort and Variations with Time
I1. Local Thermal Discomfort
I2. Radiant Temperature Asymmetry
I3. Draft
54 I4. Vertical Air Temperature Difference
55 I5. Floor Surface Temperature
I6. Temperature Variations with Time
I7. Cyclic Variations
I8. Drifts or Ramps
57 Informative Appendix J: Occupant-Controlled Naturally Conditioned Spaces
60 Informative Appendix K: Compliance Documentation Template For Thermal Comfort
61 Informative Appendix L: Measurements, Surveys, and Evaluation of Comfort in Existing Spaces: Parts 1 and 2
L1. Physical Measurements
L1.1 Overview of Comfort Prediction Using Physical Measurements. Measurements of indoor environmental parameters are converted to predictions of occupantsā€™ thermal satisfaction through calculations and tests against comfort limits.
L1.2 Environmental and Occupant Measurements. Environmental parameters are described in Section 5.1, and their measurement requirements are described in Section 7.3. For nonsteady conditions, the Section 7.3.3 prescribes measurement timing.
L2. Surveying Occupants
62 L2.1 Point-in-Time Surveys. Point-in-time (ā€œright-nowā€) surveys are used to evaluate occupantsā€™ thermal experience at a single point in time. Thermal comfort researchers have used these surveys to correlate thermal comfort with environmental fa…
L2.2 Satisfaction Surveys. A second form of thermal environment survey, a satisfaction survey, is used to evaluate thermal comfort response of the building occupants in a certain span of time. Instead of evaluating thermal sensations and environmenta…
67 L3. Evaluation of Comfort in Existing Spaces
L3.1 Analysis Based on Occupant Surveys. Surveys can assess comfort directly, in contrast to the indirect approach of calculating comfort through comfort models using measured environmental variables.
68 L3.2 Analysis Based on Measurements of Environmental Variables. Environmental measurements are linked to occupant comfort through comfort models. Two comfort models, PMV and adaptive, are specific to mechanically conditioned and naturally ventilated …
70 Informative Appendix M: Informative References and Bibliography
74 Informative Appendix N: Addenda Description

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ASHRAE Standard 55 2023
$90.46