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ASHRAE Standard 183-2024 -- Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings (ANSI Approved; ACCA Co-sponsored), 2024
- ASHRAE Online Bookstore
- Addenda
- Errata
- ANSI/ASHRAE/ACCA Standard 183-2024 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope
- 3. Definitions, Abbreviations, and Acronyms [Go to Page]
- 3.1 Terms Defined in This Standard
- 3.2 Abbreviations and Acronyms
- 4. Compliance [Go to Page]
- 4.1 Where validation of compliance with this standard is part of a permit or other review process, documentation shall be provided indicating that the method used, the assumptions, and the execution of the method meet the requirements of this standard.
- 4.2 The method shall utilize data and perform calculations in a manner that meets the requirements of this standard.
- 4.3 Inputs to a method shall be determined in a manner that meets the requirements of this standard.
- 5. Weather Data and Indoor Design Conditions [Go to Page]
- 5.1 Indoor design conditions shall be established by owner criteria, local codes, or comfort criteria.
- 5.2 Cooling calculations shall use values of outdoor air temperature and humidity for the building use, the building location, time of year, and time of day.
- 5.3 Solar radiation for cooling calculations shall use solar flux conditions for the building location, time of year, time of day, and orientation of the surface receiving the solar radiation.
- 5.4 Heating calculations shall use values of outdoor air temperature for the building use and the building location.
- 6. Cooling Load Method [Go to Page]
- 6.1 The calculation method shall account for convective heat gain, radiant heat gain, and the thermal mass effect on cooling load.
- 6.2 The cooling load calculation shall address the hours of the day and months of the year necessary to establish the peak cooling load and the hour at which it occurs. The peak load may occur at any of a number of possible hours.
- 7. External Heat Gains [Go to Page]
- 7.1 Fenestration
- 7.2 Opaque Building Envelope. The heat gain of opaque building envelope components shall account for solar radiation and temperature-driven heat gain, shall consider the thermal performance of materials in the opaque building envelope component, and ...
- 7.3 Infiltration. The calculation method shall account for separate sensible and latent infiltration heat gains when infiltration exists.
- 8. Internal Heat Gains [Go to Page]
- 8.1 Internal heat gains shall be included in the cooling load.
- 8.2 Sensible and latent heat gain components of all internal gain contributors shall be considered separately.
- 8.3 Evaluation of heat gains from the occupants shall take into account the number of occupants, their activity levels, and the occupancy schedule.
- 8.4 Evaluation of heat gains from lighting and internal equipment shall consider their operation schedules and load factors.
- 8.5 Evaluation of heat gains from lighting equipment shall account for heat transfer to the ceiling plenum (if applicable).
- 9. Heating Load [Go to Page]
- 9.1 Heating load calculations shall be based on peak temperature-driven heat loss through the building envelope.
- 9.2 Credit for solar heat gains and for internal heat gains shall not be included as part of the calculation of the peak heating load.
- 9.3 Infiltration shall be accounted for when it exists.
- 9.4 Heating load calculations shall account for cold processes or equipment in the zone that absorbs heat (for example, some refrigerated cases).
- 10. System Cooling and Heating Loads [Go to Page]
- 10.1 Cooling and heating system loads shall account for the capacity required to accomplish psychrometric processes. Psychrometric processes include conditioning for reheat, dehumidification, humidification, and air mixing.
- 10.2 Energy from fans and pumps used in cooling systems shall be accounted for in system cooling loads.
- 10.3 Heat transfer through piping and ductwork walls shall be accounted for in determining system loads.
- 10.4 Duct leakage shall be considered in determining system load.
- 10.5 Outside air cooling and heating loads shall be calculated for the particular system configuration and weather data.
- 10.6 Diversity due to variations in actual occupancy, lighting, or equipment use shall be considered in determining system cooling loads.
- 10.7 Based on the specific type of system designed, the system cooling and heating loads shall account for inherent system inefficiencies such as damper leakage.
- Informative Appendix A: Choice of Methods
- Informative Appendix B: Recommended ASHRAE/ACCA Compliance Form for Standard 183 [Go to Page]
