Minimum Ventilation Velocities for Maintaining Space Station Crew Comfort

Format:

Conference/Event

Author/Creator:

Sargent, D. H., author.

Conference Name:

International Conference On Environmental Systems (1993-07-12 : Colorado Springs, Colorado, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1993

Summary:

The ventilation velocity requirements for crew comfort and heat transfer were assessed, as one of several initiatives to ensure that sufficient electric power will be available for Space Station Freedom during the early Man-Tended Capability (MTC) Phase of operations. A rigorous heat transfer analysis, to accommodate microgravity and reduced pressure conditions, was conducted to characterize cabin air effectiveness in transferring metabolic heat away from crewmembers. Maximum possible sweat evaporation rates were estimated based upon rigorous mass transfer correlations.In the range of low work rates applicable to MTC, no single mechanism dominated the heat transfer. Those mechanisms not dependent upon ventilation velocities, radiation and respiration, appeared to be as important, under the nominal conditions, as forced convection and sweat evaporation. It was shown that ventilation velocities could be lower than 15 feet per minute, and still provide sufficient heat flux. These results, in conjunction with test results, led to a reinterpretation of the requirements permitting a lower average velocity than before, and to substantial reductions in cabin air fan power requirements

Notes:

Vendor supplied data

Publisher Number:

932191

Access Restriction:

Restricted for use by site license