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Investigation of Transient Performance for a SublimatorSublimators have been used as heat rejection devices for a variety of space applications including the Apollo Lunar Module and the Extravehicular Mobility Unit (EMU). Sublimators typically operate with steady-state feedwater utilization at or near 100%. However, sublimators are currently being considered to operate in a cyclical topping mode, which represents a new mode of operation for sublimators. Sublimators can be used as a topper during mission phases such as low lunar or low earth orbit. In these mission phases, the sublimator will be repeatedly started and stopped during each orbit to provide supplemental heat rejection for the portion of the orbit where the radiative sink temperature exceeds the system setpoint temperature. This paper will investigate the effects of these transient starts and stops on the feedwater utilization during various feedwater timing scenarios. The X-38 sublimator and Contamination Insensitive Sublimator (CIS) were tested in a ground vacuum chamber to understand this behavior and to quantify the feedwater performance. Data from various scenarios will be analyzed to investigate feedwater utilization under the cyclical conditions
Document ID
Document Type
Conference Paper
Sheth, Rubik B.
(NASA Johnson Space Center Houston, TX, United States)
Stephan, Ryan A.
(NASA Johnson Space Center Houston, TX, United States)
Leimkuehler, Thomas O.
(Paragon Space Development Corp. Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
Meeting Information
41st International Conference on Environmental Systems(Portland, OR)
Funding Number(s)
WBS: WBS 780896.04.06
Distribution Limits
Public Use Permitted.
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