FANS
T he cube law principle dictates that energy consumption can be reduced to the cube of the amount by which the fan speed has been reduced. For example, if you half the speed of the fan, energy usage will be reduced to an eighth of the amount previously used.
In addition, and by incorporating a heat
r ecovery device into an air handling unit, energy usage can be further optimised.
Using a thermal wheel for heat recovery in an air handling unit, such as Fläkt Woods’ eCO Premium, means that between 80-90% of heat from the extracted air can be recovered. This can b e subsequently used to warm the incoming fresh air.
To avoid overheating during times when the weather is warmer, the thermal bypass facility has the ability to control and vary the amount of h eat recovered, whilst the thermal wheel itself c an remove humidity to enhance comfort for o ccupants.
Moreover, a mechanical ventilation heat
recovery system can also use colder night time air in the summer months to pre-cool the building fabric and therefore provide a more comfortable e nvironment in the mornings.
D uring the daytime, cooler indoor air, chilled water, refrigerant coils or an evaporative h umidifier can all lower the incoming air t emperature.
Noise reduction
M echanical ventilation units have the capability t o limit incoming noise. This is because they have smaller openings in the façade when compared to natural ventilation, which is assumed to be fully open.
W here acoustic louvres are used with natural ventilation to reduce incoming noise levels, l arger openings would be required to maintain airflow, posing a security risk. Any noise from the air handling unit in a mechanical system can be reduced simply by fitting silencers in the ductwork or, alternatively, close to the unit. M oreover, It can also be independently tested to ensure that acoustic performance is g uaranteed, and it is not subject to changing weather conditions.
Therefore, mechanical ventilation does not o nly provide a suitable option for commercial buildings in noisy locations. Indeed, it is also t he ideal choice for other buildings that suffer
from poor acoustics. This could include Victorian b uildings without adequate sound insulation, or modern multi-purpose open plan spaces which a re affected by background noise.
A window of opportunity
At present, is unclear at this stage whether more stringent standards for IEQ will be incorporated within the EPBD, or if any future changes to the EPBD will affect UK buildings regulations post- Brexit.
H owever, there is one thing of which we can b e certain. The optimisation of IEQ and energy efficiency should not continue to stay mutually exclusive of one another.
Indeed, this becomes even more significant w hen we consider that technologies such as v ariable speed fans and heat recovery devices h ave already been employed in applications such as mechanical ventilation, in order to achieve both goals.
The window of opportunity to improve the IEQ of our buildings without jeopardising the e nvironment is here now, to help ensure long- term health and wellbeing not just for EU, but a lso UK citizens.
Temperatur range -30 ˚C up to +80
The low cost pipe support for Armaflex system compatibility
x system c Armacell
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ent s thermal VA
applic ations t: 0161 287 7100
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63
Temperature up to +80˚C
Thermal Conductivity 0.033 W/(m · k) Light weight pipe
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Energy saving &
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