EMERGENCY BREATHING AND SUIT PRESSURIZATION SYSTEM.

Abstract : The design and fabrication of an Emergency Breathing and Suit Pressurization System (EBSPS), capable of sustaining three full-pressure suited crewmen within the Aerospace Medical Research Laboratories Life Support System Evaluator, has been investigated. Two operating modes are provided. One, when the Evaluator is pressurized, the Emergency Breathing and Suit Pressurization System operates as an openloop system and ventilates the pressure suit with the ambient air. Two, when the Evaluator is depressurized, the Emergency Breathing and Suit Pressurization System operates as a closed environmental control system, and provides the crewmen with a habitable atmosphere. In this latter mode, the system regulates the suit pressure, the CO2 partial pressure, relative humidity, composition (100% O2), and temperature of the ventilating air, and supplies oxygen for breathing and leakage make up as required. In all modes, the Emergency Breathing and Suit Pressurization System regulates the flow of ventilating atmosphere through the pressure suits. (Author)