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Envelopes of Operating Conditions for Acceptable Crew Comfort at Low Space Station Ventilation Velocities
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English
Abstract
It was shown in a previously-published study, that for the light crewmember activity levels applicable to Space Station, ventilation velocities could be lower than 15 feet per minute, and still provide for crew comfort. However, the previous calculations to determine the effects of ventilation velocity upon heat flux were conducted only for nominal values of other environmental parameters. As described in this paper, the study has been expanded to establish envelopes of operation in terms of five main independent variables: crewmember activity levels (metabolic rates), cabin air temperatures, cabin air relative humidities, ventilation velocities, and levels of clothing. The results are presented in terms of data tables, such that the boundaries for achieving acceptable crew comfort can be determined for combinations of the five independent variables over realistic ranges. Using these tables, sets of operating conditions might be chosen as alternatives to the most power-intensive (high velocity) one, to achieve the required heat flux for comfort.
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Sargent, D., "Envelopes of Operating Conditions for Acceptable Crew Comfort at Low Space Station Ventilation Velocities," SAE Technical Paper 941508, 1994, https://doi.org/10.4271/941508.Also In
References
- System Specification for the International Space Station Alpha SSP 41000A 31 March 1994
- Sargent, D.H. Minimum Ventilation Velocities for Maintaining Space Station Crew Comfort SAE Publication 932191 23rd International Conference on Environmental System July 14 1993
- Man-System Integration Standard I October 1989
- Physiological Principles for Comfort and Health, Chapter 8 8.4 8.6 ASHRAE Handbook 1985 Fundamentals Volume, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc. Atlanta, GA 1985
- Physiological Principles for Comfort and Health, Chapter 8 8.15 8.17 ASHRAE Handbook 1985 Fundamentals Volume, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc. Atlanta, GA 1985