Gravity-Independent Heat Exchangers and Oil-Free Compressors for Modular Refrigeration System

A modular refrigeration system using a vapor compression cycle with gravity-independent heat exchangers and oil-free compressors will be developed to meet targeted space refrigeration needs for lunar and planetary missions, capable of near-term technology infusion. The system will be capable of scaling to meet capacities ranging from 200 W to 1000 W and will deliver an efficiency equivalent to 45% of Carnot. Linear compressor technology will be leveraged to provide oil-free operation. Together with optimized, small diameter tube heat exchangers, the system will be capable of providing robust operation in microgravity conditions. Phase I activities will focus on full design development based on analytical modeling as well as experimental validation of the linear compressor technology. These activities will enable development of a comprehensive design for full prototype validation in Phase II.