Description

The collection of data described in Part I of this Final Report describes the performance of 31 general-ventilation-type air filters, using the methods of ASHRAE Standard 52.1 on full-size filters. These data were gathered for fixed airflow, as specified in the standard, and under simulated VAV operating conditions (with airflow cycling between filter rated flow and half that flow). In addition, particle-size efficiency measurements were made, using ambient atmospheric dust as a test aerosol and a white-light scattering aerosol spectrometer. The loss of filter fibers was determined by passing HEPA-filtered air through the filters (in clean condition) while measuring the downstream aerosol spectra with the same aerosol spectrometer. The dislodgement of collected dust was measured in the same way, using dust-loaded filters.

The 15 fibrous media used in 30 of the 31 filters tested were also evaluated as flat-sheet samples. (The 31st filter was an electrostatic air cleaner, which had no fibrous media). Media thickness and resistance were measured as a function of media velocity. A rough measure of media fiber diameter distributions was made using a visible-light microscope.

The overall goal in this project was to develop an algorithm which would relate filter resistance and particle-size efficiency to be predicted as a function of operating time under a typical VAV operating sequence and typical dust conditions.

Product Details

Published:

1999

Number of Pages:

391

File Size:

1 file , 9.6 MB

Product Code(s):

D-RP-675