In addition, as the units have integrated cross-flow or rotary heat exchangers, they enable heat from the room air to be used. As air passes through the units, the integral heat exchangers recover the heat, providing free heating of the air in winter or free cooling in summer. When assessing whether a decentralised
approach is appropriate for your project, the design configurations of the units should be considered carefully. As each unit will require access to a fresh air source, it is important to find a range of units offering as many configurations as possible, to ensure that they can be installed in many different physical locations, to suit the site. Some ranges include units for vertical or horizontal installation next to windows, for placement under window sills of external walls, or for installation directly under the ceiling or actually fitted into the suspended ceiling. See Figure 1. Advantages This approach has a number of advantages. Firstly, 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 units calculates and adjusts to demand and filters reduce fine dust, pollen and pathogens in the room air for better health and hygiene. Secondly, decentralised ventilation units can minimise planning and loss of space, whilst ranges designed for installation in multiple locations within the space offer greater flexibility and design freedom. All components for filtration, 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, some can also be connected to the central building management system due to an integrated FSL Control III control, for management and monitoring. Lastly, there is the potential for valuable
energy efficiency gains. Heat recovery is available all year round, enabling heating to be reduced during the winter, and creating a cooler indoor environment in warmer weather. Best-in-class units are those incorporating rotary heat exchangers which operate regeneratively. The thermal energy is temporarily stored in the storage mass, a solid, slowly rotating wheel, and then, as the wheel comes into contact with the other airflow,
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is transferred to this other airflow. This process results in much higher efficiency levels. To summarise, a traditional air
conditioning system is not the only way of improving air quality in buildings and spaces. By adopting a decentralised approach, the problems of poor air quality (and the inevitable complaints from building occupants that can result from inadequate ventilation) can be solved effectively without the need for centralised air handling plant.
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