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Wellbeing in buildings
been designed with the fans in the correct position and are fitted with purging sectors as standard. In addition, the rotor is well sealed both on the perimeter and across the diameter where the supply and extract airstreams are separated. The return (extracted) air is filtered before reaching the thermal wheel and pressure measurement nipples are provided to make it easy to check the pressure balance and a pressure reducing perforated plate is included in the unit. This means that the leakage rate is less than 1% for both units with rotary and plate heat exchangers. The GOLD units also feature several special control functions to help with indoor
air quality. • The air quality control (AQC) function is used to guarantee that the heat exchanger’s direction of air leakage and the purging sector work correctly. • Carry over control controls the rotational speed of the rotor when the airflow rate is reduced in variable air volume systems. This ensures the function of the purging throughout the operating range and reduced leakage even further.
Conclusion
pressure difference is correct which means, firstly, the fans need to be correctly positioned so that they are both downstream of the rotor in their respective airstreams and, secondly, that the extract air is correctly throttled to create the correct pressure difference between extract and supply. Swegon’s installation documentation explains how this should be done. However, it is always good practice to inspect all heat recovery equipment
(including plate heat exchangers) to ensure any possible leakages from the exhaust air side to the supply side are addressed. Adjusting the pressures can also minimise the potential for cross-contamination, including the use of bypass valves and/or dampers to avoid higher pressure building up on the extract side.
How does the Swegon GOLD heat exchanger work?
This may seem complicated, but it is good to know that Swegon air handling units with rotary heat exchangers from the GOLD and SILVER C series, have
In short, the same concept of good, basic engineering practice applies as in any health and wellbeing context, if ventilation equipment is of sufficient quality and has been properly designed, installed and maintained, then the risk of virus transmission from a thermal wheel is extremely low. What this period has taught us all, however, is to be vigilant and to further focus
on the importance of quality equipment from knowledgeable manufacturers, and of comprehensive monitoring and maintaining of our equipment. Thanks to low occupancy levels (only likely to increase gradually), this is a good
time to carry out thorough HVAC system checks, look at any tweaks or upgrades that we might want to make and ensure all maintenance is up to date. In other words, doing what we must always do to keep building occupants safe and healthy. Swegon is part of the Swedish Latour group and is a market leader in energy
efficient ventilation and indoor climate products and systems. It employs 2,400 staff and has a turnover of approximately EURO500 million worldwide – over £54m of which is in the UK.
THE BEST INDOOR CLIMATE FOR FANS AND VISITORS B
oston United Football Club’s new Jakemans Community Stadium west stand has been equipped with a high efficiency premier air conditioning system by Toshiba.
The Super Heat Recovery Multi (SHRM-e) variable refrigerant flow (VRF) solution, installed by Formost Air Conditioning Ltd, will provide outstanding indoor comfort for fans and visitors as part of the brand new ground and stadium development. Facilities include a banqueting room, lounge, boardroom, community hub and four hospitality suites, all air conditioned to the highest standards with a combination of Toshiba SHRM-e systems linked to the company’s VN heat recovery fresh air ventilation units.
The VN systems harness energy from exhaust air to pre-condition incoming fresh air, integrating with the heat recovery VRF system to create a total building solution. Use of the VN units reduces the
capacity of over 5,000. It will provide a range of community, sports, education and training programmes, plus in due course a sports hall and an all-weather 3G pitch for community use.
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“We positioned the outdoor condensing units installed at either end of the new stadium, with plenty of space for connections and access,” said Simon Murphy, who headed the installation for Formost Air Conditioning.
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cooling and heating load and the overall size of the air conditioning system required, saving energy and reducing capital costs.
“The aim is to give our fans the best ground we can,” said David Newton, Boston United chairman. “Providing a comfortable indoor climate for visitors and their guests is a key part of the experience.” The Pilgrims’ new stadium is being built to Football League standards with increased
“Toshiba offers a great combination of quality, reliability and competitive pricing. We have been installing Toshiba air conditioning equipment for many years, ever since we were established and it is a brand we can always trust to perform and do a great job.”
The new Jakemans Community Stadium is part of the area’s wider Quadrant development, which includes housing, a hotel, petrol station, a care home and retail units.
www.heatingandventilating.net
January 2021
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