Theses and Dissertations


Taylor Burch

Issuing Body

Mississippi State University


Cho, Heejin

Committee Member

Bhushan, Shanti

Committee Member

Knizley, Alta

Date of Degree


Original embargo terms

Visible to MSU only for 2 years

Document Type

Graduate Thesis - Campus Access Only


Mechanical Engineering

Degree Name

Master of Science


James Worth Bagley College of Engineering


Department of Mechanical Engineering


A unique accelerated aging chamber for experimentally determining the life of nuclear grade high efficiency particulate air (HEPA) filters was designed, implemented, and characterized. A design document was developed under the Nuclear Quality Assurance program (NQA-1). The aging process is achieved by sustaining an elevated humidity condition inside the chamber for an extended period of time. Elevated humidity conditions expose the media to commonly occurring stressors that mimic the degradation a typical filter in practical applications would experience. The aged media may then be analyzed using autopsy methodology resulting in data that can be used to better understand the useful life of HEPA filters. The chamber allows age studies to be conducted in a fraction of the time. The industry requires a more complete understanding of the useful life of HEPA filters as opposed to the rule of thumb which states to dispose filters 10 years after the manufacture date.