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International Space Station Crew Quarters Ventilation and Acoustic Design ImplementationThe International Space Station (ISS) United States Operational Segment has four permanent rack sized ISS Crew Quarters (CQs) providing a private crew member space. The CQs use Node 2 cabin air for ventilation/thermal cooling, as opposed to conditioned ducted air-from the ISS Common Cabin Air Assembly (CCAA) or the ISS fluid cooling loop. Consequently, CQ can only increase the air flow rate to reduce the temperature delta between the cabin and the CQ interior. However, increasing airflow causes increased acoustic noise so efficient airflow distribution is an important design parameter. The CQ utilized a two fan push-pull configuration to ensure fresh air at the crew member's head position and reduce acoustic exposure. The CQ ventilation ducts are conduits to the louder Node 2 cabin aisle way which required significant acoustic mitigation controls. The CQ interior needs to be below noise criteria curve 40 (NC-40). The design implementation of the CQ ventilation system and acoustic mitigation are very inter-related and require consideration of crew comfort balanced with use of interior habitable volume, accommodation of fan failures, and possible crew uses that impact ventilation and acoustic performance. Each CQ required 13% of its total volume and approximately 6% of its total mass to reduce acoustic noise. This paper illustrates the types of model analysis, assumptions, vehicle interactions, and trade-offs required for CQ ventilation and acoustics. Additionally, on-orbit ventilation system performance and initial crew feedback is presented. This approach is applicable to any private enclosed space that the crew will occupy.
Document ID
20100017014
Document Type
Conference Paper
Authors
Broyan, James L., Jr. (NASA Johnson Space Center Houston, TX, United States)
Cady, Scott M (GeoControl Systems, Inc. Houston, TX, United States)
Welsh, David A. (MEI Technologies, Inc. Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2010
Subject Category
Acoustics
Report/Patent Number
JSC-CN-20185
Meeting Information
International Conference on Environmental Systems(Barcelona)
Funding Number(s)
WBS: WBS 401769.06.05.01.02.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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