AIR HANDLING FANS
rotary heat exchanger (see Figure 2) works by using a slow- rotating, aluminium matrix (fi lled with tiny, porous aluminium ducts) and sits at the intersection of exhaust and supply air streams. It continuously transfers heat and moisture from warm exhaust air to cold incoming supply air, enabling high- effi ciency (over 75-80%) energy recovery. The wheel acts as a regenerative storage mass, picking up heat from the exhaust stream and releasing it into the supply stream, often recovering moisture to prevent air from becoming too dry. As the wheel rotates, it passes through the warm exhaust air and absorbs heat. It then passes through the cold incoming supply air, releasing that stored heat. Trox units use a sorption-treated coating on the wheel that acts as a humidity exchanger, transferring moisture from the humid air stream (either exhaust or supply, depending on the season) to the dry air stream to maintain balanced indoor humidity. The rotation is continuous, which prevents freezing in cold climates, eliminating the need for preheaters or complex defrosting mechanisms. The motor speed can be adjusted to modulate the thermal performance. The process effi ciently recovers both sensible heat (temperature) and latent heat (humidity), making it highly eff ective for energy-effi cient buildings. Improvements in air quality: With a decentralised
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ventilation approach, air quality levels are measured by the unit itself, enabling fresh air supply to adapt automatically to demands, as levels of occupancy and types of usage of the room change during the day. An integrated air quality sensor in the Trox units, for example, calculates and adjusts to demand. Filters (of at least ISO ePM1 60%, formerly F7, in the case of Trox units) reduce fi ne dust, pollen and pathogens in the room air for better health and hygiene. Practical benefi ts: Decentralised ventilation units can minimise planning and loss of space, whilst ranges designed for installation in multiple locations within the space off er greater fl exibility and design freedom. All components for fi ltration, heat recovery, thermal treatment of the air and control are already integrated in the units. Even though the units are perfectly capable of operating independently, the Trox range, for example, can also be connected to the central building management system due to the integrated FSL Control III control, for management and monitoring. To conclude, there are many buildings and spaces for which
traditional systems involving AHUs are simply not feasible or desirable, but that does not mean that occupants have to suff er (and complain about) hot, stuff y rooms.
"High-
occupancy sites such as schools, care homes, offi ces and gyms may have the most urgent need for eff ective and energy- effi cient cooling,
heating and ventilation."
www.acr-news.com • July 2026 31
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