Multi-Environment MLI: Novel Multi-Functional Insulation for Mars Missions

Human exploration requires advances in cryogenic propellant storage for missions to Earth orbit, cis-lunar, Mars and beyond. NASA has need of new technology offering high performance insulation for Mars missions, including Mars LOX or LCH4 surface liquefaction and storage and Mars Lander/Ascent Vehicle. Quest Thermal Group has developed Multi-Environment MLI (MEMLI), a novel multi-functional thermal insulation system that uses a thin lightweight semi-rigid Vacuum Shell supported by Quest IMLI layers and spacers for low heat flux and optimized for Mars atmospheric pressure.Quest engineers designed, modeled, analyzed, fabricated and tested a novel multi-functional insulation capable of providing high thermal performance both in-space and on-Mars surface for Mars missions. A thin metal semi-rigid vacuum shell is optimally supported by Quest IMLI spacers, providing low heat flux and low mass.A 10-layer MEMLI prototype provided low 0.19 W/m2 heat flux both in-vacuum and at 4.5 torr CO2 (105-210K), with a low mass of 1.5 kg/m2. Multi-Environment MLI was successfully proven feasible, is at TRL4, and remains a strong candidate for NASA Mars surface liquefaction and Mars Lander needed new technology.This Phase II program will continue developing MEMLI, with focus on further development of lightweight, supported Vacuum Shells for use on more real world tanks, development of flight-like hardware for vacuum control, increasing robustness and durability, and maturing the technology.Tasks in the Phase II program include validation of Mars mission requirements, Phase I review, updating structural and thermal models, continued development of very thin welded semi-rigid vacuum shells (down to 0.005” thick) studying their application, performance and durability for Mars missions. MEMLI will be built, installed and tested on larger, more complex cryogenic tanks for performance in all mission environments (in-air prelaunch, in-space cruise, and on-Mars surface).