A Study on the Effectiveness of Alternative Commercial Ventilation Inlets that Improve Energy Efficiency of Building Ventilation Systems
2020
Passive air pollution control devices known as
aspiration efficiency reducers (AER) have been developed using
aspiration efficiency (AE) concepts. Their purpose is to reduce the
concentration of particulate matter (PM) drawn into a building air
handling unit (AHU) through alterations in the inlet design improving
energy consumption. In this paper an examination is conducted into
the effect of installing a deflector system around an AER-AHU inlet
for both a forward and rear-facing orientations relative to the wind.
The results of the study found that these deflectors are an effective
passive control method for reducing AE at various ambient wind
speeds over a range of microparticles of varying diameter. The
deflector system was found to induce a large wake zone at low ambient
wind speeds for a rear-facing AER-AHU, resulting in significantly
lower AE in comparison to without. As the wind speed increased, both
contained a wake zone but have much lower concentration gradients
with the deflectors. For the forward-facing models, the deflector
system at low ambient wind speed was preferred at higher Stokes
numbers but there was negligible difference as the Stokes number
decreased. Similarly, there was no significant difference at higher wind
speeds across the Stokes number range tested. The above results
demonstrate that a deflector system is a viable passive control method
for the reduction of ventilation energy consumption.
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