AIR IRAH NSW Di Division M n Meeting ng Critical Up l Updates Australi lian S n Stand ndards & & B BCA 24 24 th th J June ne 2 2014 Presented by Owen Ryan� Business Development Manager Aeroseal Duct Sealing Pty Ltd�
AS 4254.2- 2012 Duct Leakage Testing Originally Presented by: Mark Jacobson – National BIM Operations Manager AIRAH Brisbane Meeting 18 th March 2014
Leakage Testing – Standards & Guidelines • Building Code of Australia (BCA) 2013 • AS 4254.2 2012 Section 2.2.4 • DW 143 – A Practical Guide to Ductwork Leakage Testing • CIBSE Code A; Air Distribution Systems, Section AA2.5
AS 4254 - 2002 • AS 4254 – 2002 was the previous applicable standard • No requirement for field leakage testing was required, only design allowances • Focus was on construction and material requirements
Duct Leakage Testing – Why Does It Matter? • AIRAH DA 09 adopts a 5% duct leakage • This equates to a fan delivery requirement of 105% to achieve design • The increase in airflow equates to a 16% increase in power consumption • Supply duct can sweat at leakage point • Return duct leakage adds to plant heat load • Chillers and cooling towers have to work harder • Early testing has found on average a 10% leakage rate which equates to a 33% increase in power consumption
AS 4254.2 - 2012 Testing Parameters • Test 10% of each system – test must include a portion of the floor distribution, risers, seam types, plantroom duct, etc • Test leakage performance at 1.25 times the calculated operating pressure in the tested section of duct • Leakage is not to exceed 5% of the test branch design air quantity • Tested in accordance with DW 143, Appendix B
Testing Equipment (TSI PANDA)
Testing Setup
Final Thoughts • Clearly defines how the system will be tested (positive or negative) • Allow for leakage test points in risers so you don’t have to test the system as a whole • Discuss with the duct manufacturer the acceptable sealing methods (detailed within AS 4254.2 – 2012) • Discuss with the site install team how risers will be installed • Get on site early and test completed sections to ensure compliance • Carry out test before insulation of ductwork • Sources of leaks include Joints, VAV boxes, fire dampers, access hatches, duct heaters, etc.
Riser Sealing Issues Duct leakage cost $$’s - especially on large high rise buildings Cleats are often missed Bolts are due to poor often missed access due to poor access
Aeroseal Technology Aeroseal Duct Sealing tackles leaks from the inside out. The Aeroseal process puts escaping air under pressure and causes Low VOC Vinyl Acetate Polymer particles to stick first to the edges of a leak, then to each other until the leak is closed. By isolating the ducts and using computer based software, our technicians are able to accurately measure the original duct leakage and improvement achieved with the Aeroseal process in your system.
Benefits Airtight Savings Airtight Comfort • Reduces Energy Waste • Saves Energy and Money • 90% Reduction in Leaks • Improves Comfort & Indoor Air Quality • Enhanced Building Pressurisation • Safe Effective Sealant Solution
Would you like to Learn more? We will be conducting Lunch’n’Learn sessions We are looking for Sample and Case Study projects We wish to provide you and your clients with a cost-effective, state-of-the-art solution to your duct air leakage issues Please speak to me after the meeting for any further information ¡
Any Questions ???
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