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THE AUSTRALIAN INSTITUTE OF REFRIGERATION, AIR CONDITIONING AND HEATING

TECHNICAL
HANDBOOK
6th EDITION
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TECHNICAL HANDBOOK
2021
6th Edition
The Australian Institute of Refrigeration, Air Conditioning and Heating (Inc.) (AIRAH)
Level 3/1 Elizabeth Street Melbourne, Vic 3000, Australia
Tel: (+61 3) 8623 3000
Email: [email protected]
www.airah.org.au

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DISCLAIMER
The information or advice contained in this document is intended for use only by persons who have had adequate technical training in
the field to which the guide relates. The document has been compiled as an aid only and the information or advice should be verified
before it is put to use by any person. Reasonable efforts have been taken to ensure that the information or advice is accurate, reliable
and accords with current standards as at the date of publication. To the maximum extent permitted by law, the Australian Institute of
Refrigeration Air Conditioning and Heating Inc., its officers, employees and agents:
a) disclaim all responsibility and all liability (including without limitation, liability in negligence) for all expenses, losses, damages and
costs, whether direct, indirect, consequential or special you might incur as a result of the information in this publication being
inaccurate or incomplete in any way, and for any reason; and
b) exclude any warranty, condition, guarantee, description or representation in relation to this publication, whether express or implied.
In all cases, the user should also establish the accuracy, currency and applicability of the information or advice in relation to any specific
circumstances and must rely on his or her professional judgement at all times.

© Copyright
The Australian Institute of Refrigeration Air Conditioning and Heating (Inc.)
ABN 81 004 082 928

First Edition
May 1989
Second Edition May 1995
Third Edition
January 2000
Fourth Edition September 2007
January 2013
Fifth Edition
Sixth Edition
March 2021

ISBN: 978-0-949436-21-4

Design and layout: Spike Creative • www.spikecreative.com.au

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AIRAH Technical Handbook© 2021

Preface to 6th edition
Welcome to the 6th edition of the AIRAH Technical Handbook.
For more than three decades now, this handbook has been
an integral part of AIRAH’s service to its members, and it is
with much pride that AIRAH provides you with this newly
revised edition.
This edition of the handbook sees a back-to-basics approach,
and a return to focusing on the engineering fundamentals of
the science of HVAC&R. Most of the charts, graphs, equations,
calculators, application tables and guidelines have been
incorporated into the core handbook sections for ease
of reference. The larger data tables and more descriptive
engineering and management materials are all grouped in a
series of virtual appendices.
Some AIRAH members like to show and use the printed
version of the handbook, while others prefer to work with a
digital version. AIRAH asked, and the majority of members
who expressed a view, preferred the handbook to be
available in both formats. As a result, the 2021 AIRAH Technical
Handbook continues to be produced in both print (Sections
only) and digital formats, with the virtual appendices and
other associated materials now available online at the 2021
AIRAH Technical Handbook website.
Every edition of the handbook builds on the previous one,
and this edition incorporates a great deal of new data for
members, including new or updated information on the
following topics:
Design data in Section 2 – A range of additional and
updated design data has been incorporated including climate
data, solar heat gain data, ventilation data, and heat gains
data for people, lights and appliances.
Climate data in Appendix K and on the website –
includes ASHRAE data pages for 53 Australian sites, and the
pre- and post-1990 Australian DA09 Critical and Comfort
data sets.
Air distribution in Section 4 – consolidated duct
sizing information, with the full range of duct-fitting Loss
Coefficients (kT ) tables and figures now reinstated.

Thermal comfort in Section 6 – inclusion of a new AIRAH
psychrometric chart and comprehensive introductory
information on both psychrometric analysis and thermal
comfort analysis.
Residential cooling analysis in Section 6 – an
explanation of the various factors that should be accounted
for in the calculation of a residential heat-load estimate
Particulate air filters in Section 6 – updated information on
the current classification systems and test methodologies for
filter rating, and on the energy-efficiency aspects of air filters.
Maintenance of HVAC&R in Section 6
...
--------------------------------------
...r high temperatures then
the number of hours per year would be at most three times 14.4
hours = 43.2 hours per year which is roughly 10 days per year. If
however, as in places like Darwin or Cairns where there can be
six or seven months with relatively similar high temperatures,
this equates to up to say 6 times 14.4 = 86.4 hours per year which
roughly equates to about 22 days per year.
This is why the 2.0% values give noticeably lower monthly design
temperatures than the “Comfort” conditions. Hence the number
of days per year that the temperature is likely to exceed the
design conditions varies for different locations.

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AIRAH Technical Handbook© 2021

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AIRAH – National Office

JAMES HARRISON CENTRE
3/1 Elizabeth Street, Melbourne Vic 3000, Australia
Tel: +61 3 8623 3000
Fax: +61 3 9614 8249

www.airah.org.au

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