www.heatingandventilating.net
Multiple fans make sense
There are advantages to using more than one fan running in parallel on a fan grid in ventilation systems, as opposed to a traditional single fan, according to Axair Fans sales manager Geoff Edwards
redundancy which is designed to improve reliability and consistency. For example, if one fan fails within the ECFanGrid (multiple fan wall from Axair Fans), only that portion of the airflow is lost, unlike single fan systems where the entire air handler goes offline. Moreover, the loss of airflow from one plug fan can be offset by increasing the speed of the remaining fans; this can be achieved automatically in conjunction with the building’s management system. Flexibility – The number of plug fans in each
R
ECFanGrid system can vary according to the airflow requirements. For example, in a wall of nine fans in a 3×3 configuration where only seven fans may be required for normal operations to deliver the designed duty, the 8th and 9th space can be blanked off with a plate. If the demands on the AHU increase through building expansion for example, the blanking plates can be removed and one or two fans added to the grid to meet the new requirements. Efficiency – Typically, 40% of a commercial buildings energy use comes from heating, ventilating and cooling with 50% of the HVAC energy consumption
edundancy – Continuous and consistent airflow is essential to virtually every facility. Running fans in parallel allows for
coming from fans. Given the increasing cause for environmental concern, designers should look to select EC plug fans which will not only provide the necessary reliability, but also provide optimum efficiency and environmental benefits. Savings as a result of moving from AC to EC occur from both improved motor efficiency and optimising system design. There is potential to achieve greater efficiency when the system’s operating range includes multiple plug fans running closer to their peak efficiencies, instead of one large fan controlled over a wide operating range. Noise Attenuation – Case studies show that
there is the potential to significantly lower noise when using an ECFanGrid. There are two major advantages to attenuate noise. First, the noise spectrum of smaller impellers contains higher frequencies, thus the wavelengths are shorter, allowing for the use of shorter attenuators. Second, the required length of the fan section in a typical air handling unit using a single large radial fan can be reduced dramatically, in some cases up to 50%. Ease of installation – ECFanGrids are ideally suited for retrofit AHU projects, particularly where a single large radial fan is being replaced. It is often the case that buildings have expanded around an AHU over its years of operation. This can make the extraction of the old fan and installation of the new fan problematic. Plug fans can be walked through standard pedestrian doorways by no more than two operatives: a significant factor in maintaining a tight replacement schedule,
reducing costs and downtime. Ease of maintenance – The ECFanGrid is
completely free of the floor. This means that maintaining the hygiene of the AHU is quick, simple and effective. No dust is released into the supply air as there are no belt drives to degenerate over time. Furthermore, component failure is quickly dealt with due to the modular nature of the ECFanGrid. For example, a single fan module could be replaced and the AHU back online within an hour of being shut down.
LEFT: An ECFanGrid system in a 3 x 3 configuration
www.heatingandventilating.net April 2018
NEW PLAYER IN HVAC COMMERCIAL MARKET
T
hermaco, the supplier of small axial fans to some of the UK's largest domestic ventilation manufacturers, has extended its product portfolio by offering larger fans and blowers to service the commercial and industrial HVAC market Thermaco has selected its partner, Wenling Sanmu Machine Electricity Co, for its high quality and wide range of AC and EC axial fans and centrifugal forward and backward curved blowers. Sanmu’s axial fan sizes for AC, ranges from Ø200mm to Ø910mm, and Ø300mm to Ø910mm for EC, whilst their AC and EC blowers range from Ø133mm to Ø630mm. This allows enabling Thermaco to offer a product to suit the majority of applications within the HVAC sector. As Sanmu exports 70% of its products, it puts quality at the top of its priority list. Much of Sanmu’s manufacturing is kept ‘in house’. Production of motors, impellers, grilles and tubes, in addition to having a foundry for casting the motor hubs and stators, enables better quality control of materials and processes. With the implementation of automated test equipment, along with production control procedures and an inspection programme, strictly in accordance with the company’s ISO9001:2000 quality management system, Sanmu has obtained, CCC, CE and RoHS certification. To further improve its EC motor technology and
aerodynamics, and to expand its product range, Sanmu recently joined forces with a well-known university to create a joint research centre. Meanwhile, the company has gained the recognition and title of “Technical Centre of Zhejiang Province Medium and Smail Sized Enterprise” and “High- tech Research and Development Centre”. To find out more contact our head office, based in Malvern, Worcestershire, on 01684 566163 or e- mail us at
sales@thermaco.co.uk
Fans
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