Skip to main content

Resources / DA Manuals / DA09

DA09 Air Conditioning Load Estimation and Psychrometrics

Published: 2022 | Pages: 266

DA09 is the fourth edition of AIRAH’s air conditioning load estimation manual. It provides a range of information and design data that can be used in any load estimation calculation. The method outlined in this publication continues to follow the principles of the Carrier Method of load estimation, originally developed by the Carrier Corporation prior to 1972, but has incorporated several modifications not included in the original version.

DA09 covers heat and moisture flow through building elements; solar and transmission loads; internal heat gains from people, lights, and equipment; quantifying infiltration and outdoor ventilation impacts; and quantifying system effects. The manual also explains air conditioning process psychrometrics including plotting air states and interpreting psychrometric data to generate air conditioning system design/selection/operation criteria. The manual is also a source of data and default values for the estimation of internal and external loads on an air conditioning system.

DA09 sections

  1. Scope and application
  2. Building survey and load estimate
  3. Design conditions
  4. Heat storage, glazing, solar loads, diversity, and stratification
  5. Solar heat gain through glass
  6. Heat and water vapour flow through structures
  7. Infiltration and ventilation
  8. Internal and system heat gains
  9. Applied psychrometrics
  10. Appendices
    1. Climate data
    2. History of DA09 climate data sets
    3. Properties of materials
    4. AIRAH psychrometric chart
    5. Psychrometrics – characteristics of sprays
    6. Apparatus dewpoints tables
    7. References and resources

Other DA Manuals

See our full range of Design Application Manuals.

AIRAH shop

Purchase hard copies of and digital access to DA Manuals, and view our full range of products.

Technical resources

See all of AIRAH's technical resources.