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FEATURE AIR CONDITIONING


UNIVERSITY OPTIMISES VENTILATION SYSTEM


Brunel University London’s Hamilton Centre is home to a host of entertainment facilities, including bars, restaurants, and the student union. With the link between good indoor air quality (IAQ) and concentration levels becoming increasingly well established, optimising the building’s ventilation system was a top priority


Limited, comments: “Although it is important to maximise the performance of a ventilation system, this must be balanced with the associated energy expenditure. “The existing fan was incurring high running


costs and CO2 emissions, neither of


L


ocated in the heart of Middlesex, Brunel University London is home to


over 12,000 students across a wide range of disciplines. It was founded in 1966, and regularly ranks in the top 400 universities in the world. As a campus university, there are a


range of facilities located on site for students to enjoy, from shops and bars, through to gyms and nightclubs. The Hamilton Centre houses much of the entertainment for students, as well as the student union. It is a place where large numbers of people frequently meet, congregate, and spend their spare time, which makes it crucial that it is as comfortable and welcoming as possible. There is also evidence that poor IAQ has


a negative effect on the attention span of students, leading to a noticeable drop in concentration when CO2


levels are high.


Combined with longer-term effects such as headaches, coughs and respiratory problems, it is crucial that education facilities make a conscious effort to ventilate as effectively as possible.


NOT SO CLEVER A contra-rotating fan on the roof of the Hamilton Centre, which was directly responsible for ventilating a popular pizza bar in the building, was failing. It had been over specified, which meant it was oversized and using an unnecessary amount of energy. Marcus Sawkins, co-founder and managing director of GFMS Services


8 SPRING 2019 | ENERGY MANAGEMENT


which are desirable for an expanding university. Plus, the voltage required to operate the fan was unnecessarily large, which posed a problem as the controls are located in a busy kitchen.” The decision was made to replace the


fan with a more energy efficient model, but it was crucial that performance was not sacrificed. Owing to its reduced running costs, EC motor, and intuitive controls, Elta Fans’ Revolution SLC EC presented itself as an ideal fan for the application.


SHOW YOUR WORKING The transition from an AC motor to a low energy EC motor negates the need for a mains powered speed controller. As David Millward, product manager at Elta Group explains, this has a two-pronged effect: “The EC motor helps to reduce energy


bills by up to 20 per cent, which is crucial for meeting environmental targets, as well as lowering the total cost of ownership. It is also a more straightforward installation, allowing contractors to complete projects quicker and with less chance of complications.” Sawkins adds: “The simplicity of


installing the Revolution SLC EC is highlighted by the swift completion of the project – just three days. It was the perfect size to replace the existing fan, and because it was on the shelf and ready to go, the lead time was minimal.” The previous fan was hampered by complicated controls, which meant that


end users often neglected using it at all. For those tasked with delivering a high volume of pizza to on-the-go students, taking time out of their day to operate ventilation was often impossible. Reducing the electrical voltage and offering a simple dial control system has allowed operators to manage the ventilation output more effectively throughout the day.


REVOLUTIONARY OUTCOME As indoor air quality continues to dominate the agenda, there will be increased emphasis on providing adequate ventilation for building occupants. Choosing a fan based on the actual required level of ventilation is critical, as performance must be matched with running costs and overall energy expenditure. By combining an EC motor with intuitive controls and a precisely engineered impeller, it is possible to achieve optimum performance without incurring crippling energy bills. Sawkins concludes: “Brunel University


London needed a quick replacement for a fan that wasn’t meeting requirements, which necessitated a solution with a short turnaround time. Having worked with Elta Fans before, I knew that the product would be reliable, and that the lead time would be minimal. It was therefore an obvious decision to opt for the Revolution SLC EC long-cased axial fan.”


Elta Fans


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