Working Fluid and Material Selection for Heat Pipes and Vapor Chambers for use in Air-Cooled Temperature Swing Adsorption Compression Systems
Richardson, Tra-My Justine
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An air-cooled Temperature Swing Adsorption Compressor (AC-TSAC) has been identified as the preferred Temperature Swing Adsorption Compressor for use in long duration and space exploration missions. The AC-TSAC compresses Carbon Dioxide (CO2) by thermally cycling an adsorbent material from 20�C to 200�C. Heat pipes and vapors have low mass and a high effective thermal conductivity, and it is desirable to use heat pipes and vapor chambers (HP/VC) in a new AC-TSAC design. For this to be possible, the HP/VC must be properly designed for the 20�C to 200�C temperature range. An important first step of this design process is identifying working fluids and envelope materials that can be used for the HP/VC across this temperature range. In this paper, a detailed selection process is followed to identify said working fluids and envelope materials. Comparison criteria are established, and identified solutions are then compared. This paper details the efforts to find working fluid and envelope material for HP/VC.