Photographs of ((a) and (b)) safe change and ((c) and (d)) remote change filters.
Image of the indoors portion of the test stand.
Drawing of the test stand, indoors, and outdoors.
Schematic of the ICET large-scale HEPA test stand filter housing.
Illustration of (a) induced draft fan start up overshooting volumetric flow set point and (b) difficulty in controlling volumetric air flow rate during rapid increases in differential pressure.
Illustration of the optimized fan operation curve.
Test stand ductwork volumetric air flow traverses.
Tare dP for the ICET large-scale HEPA test stand housing without a filter.
PSD of the challenge aerosols.
Burner startup, alumina, ambient air, and burner post warm up PSD on a logarithmic scale.
Effect of increased volumetric flow rate on filter differential pressure.
Downstream concentration, GSD, and MPPS as a function of dP during filter loading.
Filtering efficiency for all measured particles and differential pressure vs. time.
Mass loading curve for different filter types and challenge aerosols.
In-testing images (a): 1 kPa (4 in. w.c.), (b): 2.5 kPa (10 in. w.c.), (c): 5 kPa (20 in. w.c.), (d): Failure due to pleat collapse 7.2 kPa (29 in. w.c.).
Filter rupture images.
Differential pressure, humidity, and temperature versus time for remote change filter.
Performance capabilities of the test stand.
Test stand components.
Measured aerosol parameters.
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