Accession Number:

ADA272952

Title:

Physiological Efficacy of a Lightweight Ambient Air Cooling Unit for Various Applications

Descriptive Note:

Final rept. Oct 1988-Sep 1991

Corporate Author:

ARMSTRONG LAB BROOKS AFB TX

Report Date:

1993-10-01

Pagination or Media Count:

18.0

Abstract:

In an attempt to further advance intermittent conditioned air cooling IC concept, a strategy of supplementing continuous air cooling CC was conceived. With this approach, ambient air cooling AC is added during work with conditioned air cooling delivered during rest periods. A compact, battery- powered beltpack cooling unit 8.5 lb, designed and fabricated at the USAF armstrong Laboratory, was used to deliver 12 cfm filtered ambient air during work cycles 10 cfm to the body and 2 cfm to the face. Five experimental trials were completed in a thermally controlled chamber under warm conditions 32 deg C, 40 RH consisting of no cooling NC, IC, and CC during intermittent exercise, as well as NC and AC during continuous exercise. This study suggests that ambient air delivered during work by a lightweight portable unit can be applied in conjunction with conditioned air during rest to further improve personal comfort, reduce skin temperature, and decrease the cumulative fatigue seen over repeated workrest cycles in selected military and industrial applications. Personal cooling, Heat stress, Microclimate cooling, Workrest cycle

Subject Categories:

  • Meteorology
  • Air Conditioning, Heating, Lighting and Ventilating

Distribution Statement:

APPROVED FOR PUBLIC RELEASE