Abstract

Design of a FAME-MLL High Temperature, High Pressure Compressor for a Two-Stage Refrigeration Cycle

The design and analysis for the high-temperature, high pressure compressor is part of a two-stage refrigeration cycle using Methyl Lineolate (MLL) working fluid. This refrigeration cycle is part of a Venus Lander outlined in Anderson et al. (2016) [1]. At a critical temperature of 799 K MLL fluid was selected since it was higher than the Venus environment of 738 K, so therefore latent heat transfer was used in the heat rejection. Due to the high working temperatures and pressures, the mechanical design and proper selection of materials is paramount. As shown in the Cordier diagram, [2] the high specific diameter and low specific speed of this compressor leaves only a few options including a piston type compressor and a screw compressor. To prevent significant thermal expansion or mechanical failure, Nickel-based superalloys are chosen as well as mechanical seals (gold, silver) to mitigate leakage. The 3D design will include SOLIDWORKS rendered mechanical design concepts. For the 100 W compressor, appropriate options will be considered in the presentation as well as fundamental thermodynamic and fluid analyses. [1] "Analysis of a Multi-Cascade Methyl Linoleate/SCO2/Transcritical CO2/R410-A Refrigeration Cycle for use in High Temperature, High Pressure Environments," by Kevin R. Anderson, Chris McNamara, and Ariel Gatti, proceedings of the ASME 2016 IMECE Intl. Mech. Engr. Congress & Expo., Nov. 11-17, Phoenix, AZ USA. [2] Fluid Mechanics and Thermodynamics of Turbomachinery," by S.L. Dixon, and C. Hall, Butterworth-Heinemann, 7th Ed., 2013.

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