A Closed Respiratory System Evaluator
AERONAUTICAL SYSTEMS DIV WRIGHT FIELD OH WRIGHT FIELD
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A program to develop a device capable of simulating human respiration and recording the operating characteristics of closed respiratory systems is summarized. The clos d respiratory system evaluator is capable of performing all tests necessary to evaluate the performance of any type closed respiratory system. From an analysis of all conceivable techniques of simulating the respiration of man, it was concluded that a mechanical system is superior to all others. The operation of the evaluator entails the following 1 oxygen is extracted from the gas flow along with any inert gases, carbon dioxide, and water vapor already present, 2 the inert gases unavoidably removed are added back to the flow from storage, 3 carbon dioxide and water vapor are added from storage in an amount equal to the desired addition rate plus that quantity unavoidably removed by oxygen extraction. The capabilities of the evaluator are 1 oxygen removal rate of 0.02 to 0.85 lbshr at STP, 2 carbon dioxide addition rate of 0.02 to 2.8 lbshr, 3 sensible heat addition rate of 0 to 300 BTUhr and 4 water vapor addition rate of 0.02 to 0.9 lbhr.