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Technical Paper

Phase Change Water Recovery for Space Station - Parametric Testing and Analysis

Vapor Compression Distillation (VCD) technology for phase change recovery of potable water from wastewater has evolved as a technically mature approach for use aboard the Space Station. A program to parametrically test an advanced preprototype Vapor Compression Distillation Subsystem (VCDS) was completed by Life Systems for the National Aeronautics and Space Administration (NASA) Johnson Space Center (JSC) during 1985. In parallel with parametric testing, a hardware improvement program was initiated to incorporate and verify certain key improvements into the advanced preprototype VCDS following initial parametric tests. Specific areas of improvements included long-life, self-lubricated bearings, a lightweight, highly-efficient compressor and a long-life magnetic drive. These improvements are now incorporated and verification testing started.