TechTalk Issue 80
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December 2014Newsletter Number 80
The opening of Stage 1 of Echuca Regional Healths redevelopment was a major milestone in the hospitals 130-year history of delivering care to communities along the Murray River, bordering NSW & Victoria.
The public hospital has been providing health services to the Murray region since 1882 when the first patient was admitted; however in recent years the facilities had become dated and inadequate for the current needs. In 2010 1,600 people rallied in the hospital grounds to highlight the desperate need for a new public hospital. This led to State and Federal Government funding of $65.6 million to redevelop and expand the hospital.
Echuca Regional Health Executive Project Manager Mark Hooper said the redevelopment involved rebuilding the acute care services and emergency department as well as the front entrance, pharmacy and health information services. The project allowed us to improve patient comfort, increase the buildings energy efficiencies and lift the hospitals capacity by 66%, with bed numbers rising from 68 to 113, he said.
Construction for Stage 1 began in 2013 and was completed in June 2014. Patient rooms now include an en-suite, computer and electronic call system for improved communication within the hospital. Mark said the HVAC system had been designed to create greater patient comfort by allowing them to control the environment in their room.
Brett Seeney, an Associate with WSP Consultants, Melbourne, worked closely with Mark to design the HVAC system. The innovative design earned WSP the AIRAH Award for Excellence in Innovation, 2014.
We wanted to create a 100% fresh air system with maximum energy efficiency. To help achieve this Bretts HVAC system design started with Rickard electronic Variable Air Volume (VAV) diffusers. The air conditioning system and energy recovery units were then built around them. The VAV diffusers help create a well ventilated indoor environment that maintains a consistent and comfortable temperature, Mark said.
Stage 1 of the project has 280 Rickard VAV diffusers connected to variable speed AHUs supplying air via insulated solid ducting. There is no flexible duct and the system uses static regain duct-work which ensures a constant amount of pressure to each diffuser. The diffuser aperture opens and closes depending on the volume of hot or cold air required in the room and the resulting change in pressure in the ductwork signals the air conditioning system to speed up or slow down as required.
Each room has a VAV diffuser supply and return, with two supplies fitted in the larger rooms. We were mindful that patients need to rest while in
Image by dwp Suters
Image by dwp Suters
Image by dwp Suters
Hospital redevelopment Hospital redevelopment a major win for
River Murray River Murray C o m m u n i t y
hospital and as a result the system pressure was reduced from 50Pa to 35Pa to remove all noise from the diffusers, he said.
Mark said further energy efficiencies were gained by having triple glazed windows in the bedrooms and a rooftop solar field to provide energy for the chilled water system. The overall result is designed to achieve one of the lowest energy footprints per square metre of any hospital in Victoria.
The focus is now on Stage 2 which will include an expanded emergency department, a six-bed short medical assessment and procedure unit and upgrades to maternity services. It will also see construction of the pharmacy, a spiritual space, and an aesthetic landscaping design. The project is due to be complete in September 2015.
The innovative design earned WSP
the AIRAH Award for Excellence in Innovation, 2014.
A number of new types of low profile plastic duct have recently been released onto the Australian market. It is important for specifiers and installers to ensure the new product meets Australian standards and is compliant with the Building Code of Australia (BCA). This article sets out to clarify any confusion that exists around use of these products in building services.
BCA ComplianceIn 2012, the Australian standard for ducting was re-written and split into two separate standards; AS4254.1 2012 Ductwork for air-handling systems in buildings - Flexible duct, and AS4254.2 2012 Ductwork for air-handling systems in buildings - Rigid Duct. The BCA referenced these new standards in BCA2013. Low profile plastic duct is classified as rigid duct and therefore AS4254.2 2012 is the relevant standard.
Spec C1.10 of the BCA2013 states Rigid and flexible ductwork in a Class 2 to 9 building must comply with the fire hazard properties set out in AS4254 Parts 1 and 2. As the previous version (AS4254:1995) did not have fire hazard properties, there were no fire requirements to meet. This has changed with the introduction of fire hazard properties into AS4254.2:2012.
AS4254 Part 2 Clause 2.1.2 has the following minimum requirements for a Deemed-to-Satisfy solution:
2.1.2 Rigid DuctworkMaterials used for the construction of rigid ductwork shall comply with the following requirements:
a) The assembled duct system shall have a smoke developed index not greater than 3 and spread of flame index not greater than 0 when separately tested in accordance with AS/NZS 1530.3.
b) The assembled duct system shall pass the UL181 burning test.
Therefore in order to comply with the Deemed-to-Satisfy provisions of the BCA, low profile duct must meet these requirements.
Expected resultsMost low profile ducting is made of uPVC. Table A1 of AS/NZS1530.3 states that Rigid uPVC sheet is most likely to have the following indices:
The table suggests that uPVC sheet does not comply with the Deemed to Satisfy provisions of the BCA and therefore a test certificate that shows data with a Spread of flame index of 0 and a Smoke developed index of 3 or less should be questioned for legitimacy. The UL181burning test is also required and the low profile duct should have certification showing that it also passes this test.
Technically Speaking with Kerry Dumicich
Bottom of Range
Ignitability Spread of Flame Heat EvolvedSmoke
0 0 0 5
Top of Range
Ignitability Spread of Flame Heat EvolvedSmoke
13 2 1 8
Deemed to Satisfy?A building solution will comply with the BCA if it satisfies the performance requirements as per clause A0.5 of the BCA.
A0.5 Meeting the Performance requirementsCompliance with the Performance requirements can only be achieved by
a) Complying with the Deemed-to-Satisfy provisions; or
b) Formulating an alternative solution which-
i) Complies with the performance requirements; or
ii) Is shown to be at least equivalent to the Deemed-to-Satisfy provisions; or
c) A combination of (a) and (b)
If ductwork is tested to AS/NZS 1530.3 and UL181 by a registered testing authority and it passes all requirements, it is considered Deemed-to-Satisfy and would therefore comply with the BCA. However if the tested ductwork does not meet these fire properties it is not Deemed-to-Satisfy and an alternative solution that shows compliance with the BCA performance clauses is required.
Non-compliant productIn August 2014 the ACCC initiated a recall of Infinity and Olsent branded electrical cabling due to them failing the required ageing tests in AS/NZS 5000.2:2006 which meant the insulation could become prematurely brittle with age. This recall will require replacement of accessible cable that may pose a safety concern in up to 40,000 homes and businesses. The importer Infinity Cable Co Pty Ltd is currently in liquidation and as a result the cable resellers in Australia are now responsible for the remediation work.
This example illustrates that there can be significant costs associated with non-compliant product, but it may also compromise the safety of a building and the people that occupy it. The risks and expense of having to replace large amounts of non-compliant duct from a project must be considered. The example emphasises the importance of only using low profile duct that has been tested and complies with the performance requirements of the BCA.
A Fire Engineering Assessment on Fantechs low profile plastic duct system has been completed. The results show that it meets the BCA performance requirements and it therefore complies with the BCA subject to the limitations contained in the assessment.
Clarifying the compliance of
low profi le PVC duct
at Evolved Smoke Developedddddddddddddddd
therefore complies with the BCA subject to the limitationscontained in the assessment.
with Stuart Bryson
Fans by FantechProduct Selection Program
Personalising your Schedules
Late last year Fantechs subsidiary Eltafantech Asia appointed Rahemmy Razali as its new business development manager.
Known as Emmy, she is working closely with the sales and marketing team to promote Eltafantech products into the Malaysia markets. Her role includes visiting consultants and contractors to present information on the range of Eltafantech products, optimising product selections and applications and how these can help reduce costs through improved efficiencies.
A locally born Malaysian, Emmy was glad to return to Kuala Lumpur after several years working in marketing and the supply co-ordination of products to the construction industries in the Middle East and South East Asia.
I am looking forward to creating excitement in the local market and helping to spread the word on how Eltafantechs high quality products and superior after-sales service can achieve greater results and better customer satisfaction, she said.