VENTILATION
air. CO2
can easily build up in
badly ventilated rooms and the results of this can vary from a lack of productivity to fatigue and illness.
Natural ventilation
Currently, many buildings rely on natural ventilation. However, this is not only ineffi cient, with marginal impact on air quality, but can create draughts which are a major source of heat loss as well as letting in noise distractions. In the winter months, opening windows can also make rooms feel uncomfortably chilly.
This is the dilemma faced by
specifi ers working on buildings that are exposed to high levels of noise and outdoor pollution. At the same time, owners and managers of commercial buildings are being asked to improve energy effi ciency and reduce carbon emissions. However, by designing a comprehensive ventilation system for a building, it is possible to create an optimum microclimate to deliver a healthy environment that doesn’t have to compromise energy effi ciency.
A mechanical solution One proven effi cient and cost- eff ective solution is the use of mechanical ventilation and heat recovery (MVHR) units. These work by extracting moist, stale air from the interior of the building and replacing it with fresh fi ltered
air from outside. The system uses the heat from the outgoing air to warm the incoming air via an air- to-air heat exchanger mounted within the MVHR.
This technology ticks the box both in terms of IAQ and energy effi ciency by recovering thermal energy from outgoing air. Displacing fossil fuels predominantly used to generate space heating, they off er considerable scope to reduce energy bills and achieve substantial carbon reductions, particularly on sites with multiple buildings.
Designed for a wide range of applications in the commercial sector, including offi ces, education institutions, healthcare facilities and retail buildings, Fläkt Group’s eCO Premium range is available in diff erent air-fl ow capacities, from 0.2 to 0.9m/s. Importantly, the fl ow of outside air into the building helps to reduce the levels of allergens, as well as balancing moisture and humidity levels within the premises – all of which can vastly improve IAQ.
Delivering results Highly effi cient, the system is capable of recovering 85% of the thermal energy and off ers an impressive level of control and intelligence. One important feature is that, like many energy-saving lighting control systems, the eCO Premium can
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automatically adjust to changing demands within a specifi c space, off ering demand-controlled ventilation.
With a presence detector, the system can switch on and off according to occupancy, and an internal CO2
sensor adjusts the
air supply in accordance with the number of occupants. As an added benefi t in noisy towns and cities, this type of mechanical ventilation can also limit outside distractions, with smaller openings in the façade compared to natural ventilation which is assumed to be fully open. Any noise from the air handling unit (AHU) itself can be reduced by fi tting silencers in the ductwork or close to the unit. Importantly, the fl ow of outside air into the building helps to reduce the levels of allergens, as well as balancing moisture and humidity levels within the premises – all of which can vastly improve IAQ.
With energy effi ciency and IAQ currently at the top of the regulatory agenda, it is important for HVAC professionals to stay up to speed with the latest developments. By deploying the latest heat recovery systems and demand control fans in mechanical ventilation units, designers can deliver ‘fresh’ air even where natural ventilation is not an option - and minimise energy usage in the process.
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