July 2019
Newsletter Number 90
White Rabbit
sets sail
Taking over 700,000 man-hours to complete, the world’s largest tri-hull superyacht has been delivered by Perth-based builder, Echo Yachts. Designed by Sorgiovanni Design and One2Three Naval Architecture, White Rabbit is a 100% custom-designed superyacht built to its owner’s exacting requirements. It showcases the highest standards of luxury cruising and provides amazing seakeeping, speed and fuel efficiency for a vessel of its size.
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World’s largest tri-hull superyacht
At 84m long, 29.6m at beam and having a gross tonnage of just under 3000 GT, it is the largest superyacht to be built in Australia and is the largest trimaran (tri-hull) superyacht in the world. Oh and it’s also the world’s largest aluminium superyacht.
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White Rabbit features five deck levels with over 1200m² of palatial entertaining and living space to accommodate up to 28 guests, as well as facilities for 36 crew members. The project began in 2014 when Echo Yachts Director, Mark Stothard, signed the contract to construct White Rabbit and its 46m shadow vessel, M/Y Charley, for their owner. Taking four years to complete, the project created 300 construction jobs at its peak, with multiple local contractors and suppliers also engaged. The White Rabbit superyacht features a unique hull, and is driven by dieselelectric drive propulsion with controllable pitch propellers. Power generation is located in
the outer hull while the propulsion motors are installed in the centre hull. According to Echo Yachts Design Manager, Nick Gee, this design created a number of engineering challenges which were being implemented on a yacht or vessel for the first time. As is the case with all yachts, space for services was at a premium. Echo Yachts engaged Western Australia based Systemaire, to provide a customised fan solution to ensure both sufficient air flow and pressure could be delivered. “The engine room ventilation was always a challenge to ensure that we could supply a sufficient amount of air for the engine combustion and remove the heat produced by the generators,” said Nick. “Systemaire has always provided excellent local support and technical assistance. We spent considerable time and investigated multiple options offered by Systemaire to meet the design criteria. In the end, we went with a number of unique fan selections to provide the flow and pressure required.” Among the fans supplied for the project were AP Series direct drive adjustable pitch axial fans, TD Silent and ProVent Series in-line mixed-flow fans. “One of the key challenges was meeting the air flow, noise, frequency and space requirements,” says Systemaire’s Senior Sales Engineer – Applied Technology, Lorne Adger. “This involved using some special fans, especially for the C32 generator sets.” White Rabbit was successfully launched in early September 2018 from Henderson, south of Perth, before being extensively trialled at sea off the Western Australian coastline. The superyacht was delivered to its owner in December 2018. The unique project has been recognised around the world. One2Three Naval Architects won the Best Naval Architecture Displacement Motor Yachts Award for White Rabbit at the 2019 Boat International Design and Innovation Awards. Support vessel M/Y Charley was also a finalist in the World Superyacht Awards category of Best Shadow Vessel.
Technically Speaking with Kerry Dumicich
When testing a ducted inlet and ducted outlet fan to ISO5801, a star straightener is included in the discharge duct section that simulates the conditions in a normal duct run.
22.5o
6 X Diameter of Fan Fan with Guide Vane
Discharge guide vanes on axial fans
2X Diameter of Fan
2X Diameter of Fan
1X Diameter of Fan
Example of Star Straightener used in ISO5801 Test rig.
The star straightener removes the swirl from the airstream to:
Some time ago, guide vanes were commonly supplied with axial fans in order to improve fan pressure development. However, low energy costs and a lack of focus on energy efficiency resulted in guide vanes being removed from axial fans, to reduce their cost. Today’s focus and increased emphasis on energy efficiency (through the revisions of the BCA) has made it again more commercially viable to use guide vanes with axial fans.
1 Allow accurate pressure measurement of fan discharge pressure. 2 Allow the duct designer to use standard fitting losses for pressure drop calculations. This is important as fitting losses are mostly tested with non-swirling air flow patterns. The net effect of adding a guide vane to a fan is that the reduction in swirl provides a static pressure increase when testing the fan to ISO5801. The other benefit of using guide vanes is that the fan’s power consumption remains unchanged. Fan impeller total efficiency is calculated as:
hr = q v x p f
10Pr
Where: hr = Fan impeller total efficiency qv= Fan volume flow rate in m³/s pf = Fan total pressure, Pa Pr = Impeller power, kW
If we increase the pressure development (pf ), and the power consumption remains the same (Pr ), the fan efficiency will improve. An example of this is as follows: qv Air flow (m³/s) Static Pressure (Pa) Fan Diameter (mm) Velocity Pressure (Pa) pf Total Pressure (Pa) Pr Impeller Power (kW) Impeller Total Efficiency (%)
What does a guide vane do?
When air comes off an axial fan, it travels in a rotating (swirling) pattern.
city
Rotating Velocity Component
lA
tua
Ac
Axial Velocity Component In simplistic terms, a discharge guide vane is used to straighten the fan discharge air pattern - therefore reducing the swirling velocity component. As the amount of axial fan rotational velocity is dependent on the pitch angle of the blade, the benefit of using guide vanes becomes more pronounced at higher blade angles. Guide vanes may also be used on different types of fans (such as mixed flow and centrifugal fans), but these fans have a lower rotational velocity component and therefore, the beneficial effect of a guide vane is reduced on these type of products.
Fan
Fan Fan with no guide vanes – the air comes off the impeller with a large amount of helical swirl.
Axial Fan with Guide Vane 1.72 186 500 46 232 0.53 75.3%
On-site pressure measurements. ISO5801 “Industrial fans – performance testing using standardized airways” is the international standard for testing the performance of fans. If all fan manufacturers correctly test to this standard, it means the results are comparable to a high degree of accuracy.
A swirling air flow consists of both a rotating velocity component, and an axial velocity component. The ratio of rotating velocity to axial velocity increases with blade pitch angle.
elo ir V
Axial Fan 1.72 144 500 46 190 0.53 61.7%
Guide vane Fan fitted with guide vanes – a large proportion of the swirl is converted to static pressure.
However pressure measurements on-site rarely follow the conventions of ISO5801 and as a result produce values that are not aligned to tests performed to ISO5801. Some common errors include: 1 The air flow must be straightened before measuring fan discharge pressure on site. It is impossible to accurately measure discharge pressure where significant swirl is present. 2 A ducted fan performance tested to ISO5801 includes pressure losses due to the star straightener. A normal duct system test does not include a star straightener. Therefore the on-site test result will be different to the ISO5801 test result. 3 Fan static pressure is commonly measured by subtracting the inlet static pressure from the outlet static pressure. This is incorrect. The correct measurement of fan static pressure is: Ps(outlet) – Ps(inlet) – Pv(inlet). This is a very common error and will often suggest a fan is performing correctly as the velocity pressure has not been subtracted. The above points will both increase and decrease the measured static pressure on site by various amounts depending on the impact of each error. The reality is that they are masking the system effects on the fan, and this topic will be covered in an upcoming Technically Speaking article.
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Note: Guide vanes may be used on the inlet or discharge of a fan. When guide vanes are placed upstream (inlet) of a fan, they will increase the power consumption and noise level of a fan. We have only considered the use of downstream (discharge) guide vanes in this technical article. With the increased efficiency requirements of BCA2019, the use of guide vanes may increase the choice of compliant fan selections. By reducing the swirl, guide vanes will also help the site measured pressure of an installed fan (or discharge fitting) to better align with the catalogued data.
Product News
Premium Efficiency (IE3)
S Ef upe fic r ie
2)
Ef fic H ie i n
m iu 4) em IE Pr cy ( n
IE gh y ( c
with Rudi Van Rensburg
Standard Efficiency (IE1)
Ultra Premium Efficiency (IE5 #)
Ultra efficient ECOtronic range arrives
Fantech is now the exclusive Australian and New Zealand distributor for Plymovent, a leading global supplier
of products and systems for the extraction and filtration of polluted indoor air.
The ECOtronic axial fan range delivers ultra energy efficient operation and can be designed into a Demand Control Ventilation (DCV) system. It combines the high performance Aerofoil Series 1 impeller with an intelligent Electronically Commuted (EC) shaft motor that delivers a cost effective ventilation solution. Speed control selection on the ECOtronic is managed through a small access hole located on the rear of the motor, allowing it to be changed from manual to remote speed control. If set to remote control, the ECOtronic’s speed can be increased or decreased via a 2-10V, 4-20mA, or 80-1600Hz control signal. This helps to minimise energy costs by speed controlling according to demand, particularly in applications such as schools, exhibition centres and health facilities where conditions vary during the course of the day.
EC
“
Fantech now proud distributor of
tronic
…helps to minimise energy costs
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When manual speed is selected, the fan can be adjusted from 1800rpm to as low as 200rpm. The speed change is stored in the motor’s memory, ensuring the fan runs at the selected maximum speed each time the fan is started. According to Fantech Assistant Engineering Manager Ben Lowerson, the ultra-efficient ECOtronic range features fully integrated electronics that remove the need for an external VSD and current overload protection. “Its state-of-the-art motor includes soft starting as well as locked rotor protection, over temperature protection and overvoltage/ under voltage protection,” Ben says. “The high efficiency EC motor also achieves the predicted IE5# efficiency standard, which is likely to become the highest efficiency standard possible.” The ECOtronic range achieves an IP55 rating, and is available in sizes that produce maximum air flows from .4 to 4.1m3/s*. It features a “Fire Mode” function, galvanized steel casing and an on board fault identification LED. Further information and technical specifications on the ECOtronic range can be down loaded from the Fantech website www.fantech.com.au. * Approx. air flow at 0 static pressure # The IE5 Efficiency level is not currently defined by the IEC Standard, however the intent is for IE5 motors to have approximately a 20% reduction in losses against IE4 motors.
Since the beginning of this year, Fantech has been Plymovent’s exclusive partner in the areas of Industrial Products (IP) and Exhaust Extraction Products (EEP) for the Australian and New Zealand markets. The collaboration between the two organisations will provide local companies with easy access to the latest Plymovent technology solutions and knowledge - available at competitive pricing and with the ability to meet shorter lead times. “Plymovent’s air filtration products are very complementary and a perfect fit with Fantech’s commitment to continuous improvement and innovation,” says Mr Anel Ćeman, Sales Manager Asia Pacific from Plymovent. “With their technical expertise and focus on customer service, Fantech are an ideal partner to represent our brand.” Plymovent Industrial Products are specifically designed to extract and filter fumes, smoke and oil mist from metal fabrication processes like welding, cutting, tooling and machining. The range includes mounted and mobile extraction arms, filtered extraction tables and extraction hoods, through to custom-made engineered solutions. Additionally, Plymovent offers a range of products designed to extract hazardous vehicle exhaust emissions at the source in a variety of applications. This includes fire and emergency services stations, car and motorcycle service workshops and military facilities. This high quality range includes rail systems, hose and hose reels and smart exhaust pipe connection nozzles. According to Rudi Van Rensburg, National Manager of Applied Technology at Fantech, the opportunity to offer the full range of Plymovent products is exciting. “Plymovent is known for its innovation, and its products are recognised across the world for their exceptional quality and integrity,” says Rudi. “We see this as a great opportunity to introduce a product range that will help achieve healthier working environments across Australia and New Zealand.”
Insulpak Commercial Airconditioning
Having serviced the industrial and manufacturing sectors of Geelong and western Victoria for 50 years, Insulpak continues to evolve to deliver quality outcomes for its wide client base.
Insulpak was first established in July 1969 by Mr Frank Hegyesi and his brother Andrew. Specialising in industrial insulation and sheetmetal, Insulpak began contracting to the Geelong Shell refinery – the first of Australia’s oil refineries to come on stream following the end of the Second World War. The family-operated business continued to focus on the supply and installation of industrial insulation for the next 25 years, before a generational change of management saw Frank’s sons Robert and Andrew Hegyesi expand Insulpak’s services to include air conditioning installations. In 2003, the acquisition of GRS (Geelong Refrigeration Services) allowed Insulpak to expand further with ongoing air conditioning service and maintenance. Today, Insulpak offers commercial air conditioning design, sheetmetal duct manufacture, and the supply, installation and maintenance of HVAC and refrigeration systems in both Geelong and Melbourne. Still located at 98 St Georges Road in Geelong, Insulpak employs 40 direct staff – many of whom are long term, loyal employees – as well as a great team of subcontractors and suppliers. “Our staff and clients are the backbone of
Fans by Fantech Product Selection Program
our business success to date,” says Managing Director, Robert Hegyesi. Insulpak has been involved in several high profile developments in recent years, including a $7 million design and construct HVAC contract at Deakin University’s Waurn Ponds campus. Using building information modelling (BIM), the company supplied and installed various HVAC systems for the state-of-the-art education building. “Insulpak has maintained a good business name over our 50 year history, and we continue to pride ourselves on quality outcomes, great apprentices and our work ethic,” says Robert. “We are committed to developing our HVAC business, and meeting the challenges that our clients present us with, which we all so passionately enjoy.” Fantech congratulates Insulpak on their 50 year milestone.
reaches the room (all grilles combined). Then choose the room absorption type and size. You will now have the Total Sound Pressure at the distance entered previously. By entering either the required dBA, NR or PNC for the room, this data can be reliably used to select a silencer if attenuation is required. You can Save the analysis for later retrieval or print it for inclusion with other documents.
Hints and Tips
Acoustic Analysis – Part 2
In the previous issue, we began an acoustic analysis by calculating the sound power leaving the duct system. Now we will convert this to a sound pressure level by entering the room characteristics. Click to expand the Direct Sound section on the Acoustic Analysis screen. Enter the air flow percentage that reaches the specific outlet, and the distance from the listener to the outlet. Choose the size and position of the outlet (terminal) to get the direct sound pressure. Expand the Reverberant Sound section, and enter the percentage of air flow that
Version 5.5 of the Selection Program can be downloaded from our website. Remember to use the auto-updater to make sure you’ve got all the latest features.
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Fantech Contacts
with Stuart Bryson
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