CONTAMINANT FREEZE-OUT STUDY FOR CLOSED RESPIRATORY SYSTEMS
GARRETT CORP LOS ANGELES CA AIRESEARCHMFG DIV
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The purpose of this program was to conduct an analytical feasibility study on contaminant freeze-out water vapor and carbon dioxide systemns, which employ the endothermlc conversion of liquid oxygen to gaseous oxygen as a heat sink. Simple freeze-out systems, combination freeze-out and adsorption systems, and systems with auxiliary cooling were studied and compared. From the point of view of minimum weight and minimum number of components, the simple freeze-out system with water removal dumped overboard as a vapor to a vacuum appeared to be the best system. A desirable feature of this system is that the liquid oxygen requirements are low about equal to the normal metabolic oxygen consumption rate. A possible undesirable feature is that the frozen out water is not recovered. The system uses a four-channel regenerative switching heat exchanger in which cooling with freeze out, regeneration of the effluent air, and sublimation of the frozen out contaminants occur simultaneously The final portion of the study consists of the preliminary design of a model version of the simple freeze-out system with water removal. Recommendations as to the amount and type of additional effort required to prove feasibility and to reduce the design approach to hardware practice are also given.
- Life Support Systems