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Dual Fan Separator within the Universal Waste Management SystemSince NASA's new spacecraft in development for both LEO and Deep Space capability have considerable crew volume reduction in comparison to the Space Shuttle, it is clear that NASA requires a smaller and less expensive commode. The UTAS Universal Waste Management System (UWMS) was designed to address these new constraints, resulting in an 80% volume reduction in the cabin while enhancing performance. Whereas all of the current space commodes use air flow to capture both urine and feces and separate air from the captured air/urine mixture, the UWMS commode and urine fans and the urine separator were combined into a single unit. This unit enables use of a single motor and motor controller, which provides considerable packaging and weight efficiency. In some of the intended platform applications for the UWMS, the urine is pumped to a water reclamation system. The ISS Urine Processor Assembly (UPA) system requires delivered urine to include less than 0.25% air inclusion. Air inclusion in centrifugal urine separators is greatly dependent on its rotational speed. To satisfy this requirement, a gear reducer was included, allowing the fans to rotate at a much higher speed than the separator. This new design, the Dual Fan Separator (DFS) has been designed, prototyped and tested. This paper will outline the studies and analysis performed to develop the design configuration for testing. The studies included a configuration trade study, dynamic stability analysis of the rotating bodies and a performance analysis of included labyrinth seals. NASA is considereing a program to fly the UWMS aboard the ISS as a flight experiment. The goal of the design activity is to elevate the Technical Readiness Level (TRL) of the Dual Fan Separator and determine if the concept is ready to be included in flight experiment deliverable.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Stapleton, Tom
(United Technologies Aerospace Systems Windsor Locks, CT, United States)
Converse, Dave
(United Technologies Aerospace Systems Windsor Locks, CT, United States)
Broyan, James Lee, Jr.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
April 24, 2014
Publication Date
January 1, 2014
Subject Category
Man/System Technology And Life Support
Report/Patent Number
Meeting Information
Meeting: International Conference on Environmental Systems
Location: Tucson, AZ
Country: United States
Start Date: July 13, 2014
End Date: July 17, 2014
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public Use Permitted.
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