To facilitate a crew of six astronauts, approximately 30 metric tons of oxygen propellants would be required for ascent. This significant amount would be cumbersome and costly to transport from Earth. The solution? Produce it right on Mars.
Drawing oxygen from Mars' abundant carbon dioxide (CO2) presents a significant advantage. This innovative technique is part of an approach termed in situ resource utilization (ISRU). Recent accomplishments, such as the Mars Oxygen ISRU Experiment (MOXIE) Project, have demonstrated the viability of a prototype system that can successfully convert Martian CO2 into oxygen (O2). Now, the focus shifts towards elevating this prototype into a fully operational system.
In their latest research, published in Space: Science and Technology, researchers Donald Rapp and Eric Hinterman lay the groundwork for a full-scale Mars ISRU system. Their model proposes producing 30 metric tons of liquid oxygen over 14 months, accounting for the diurnal and seasonal shifts in the Mars environment.
Their study outlines the ISRU system's architecture, setting the stage with a straightforward layout. Central to this system are electrolysis cells or stacks of these cells. These cells are responsible for converting Martian CO2 into oxygen. As they function, a compressor draws in the Mars atmosphere, compressing it from Mars' pressure to the designated stack pressure. A subsequent process involving heat exchangers pre-warms the incoming gas to the stack temperature before it's introduced into the electrolysis cells.
The system's intricacies are vast. For efficient oxygen production, the voltage across these cells needs to remain between specific parameters: above the 0.96 V Nernst voltage for oxygen production and below the 1.13 V Nernst voltage, where unwanted carbon deposition could occur.
Operational considerations are equally detailed. The proposed 14-month (420-sol) run aims to maintain an average oxygen production rate of 3.0 kg/h, leading to a total of 30,240 kg of oxygen. Various control schemes have been proposed to optimize operations, factoring in the electrolysis stacks, the compressor's revolutions per minute (RPM), and other system components.
Delving deeper into the technicalities, the researchers scrutinized area-specific cell resistance, current density, and flow rate across different control strategies. Each option displayed its unique characteristics, with specific operational voltages and configurations. Some configurations approached the boundaries of operational feasibility, signaling potential concerns.
In their analysis, the researchers provided a comprehensive understanding of power requirements. For the solid oxide electrolysis (SOXE) system, the electrochemical power varied between the control options, with additional power needs for preheating and compensating for heat loss. The study also examined the compressor's efficiency, taking into account motor losses and other factors. Finally, the rate of heat extraction from the system by the cryocooler was gauged, essential for cooling gaseous oxygen to its boiling point and subsequently liquefying it.
This extensive study on the ISRU system offers a promising step towards making Mars missions more self-sufficient, allowing future astronauts to utilize the resources of the Red Planet for their benefit.
Research Report:Adapting a Mars ISRU System to the Changing Mars Environment
|Subscribe Free To Our Daily Newsletters|
A multinational crew blasts off from Florida, heading for the International Space Station
Station Hosts 11 Crewmates from Five Countries
NASA challenges students to fly Earth and Space experiments
US seeks to extend China science accord, but only briefly for now
Pulsar Fusion forms partnership with University of Michigan for electric propulsion
Benchmark Space Systems cracks code for viable ASCENT propellant
Japan postpones 'Moon Sniper' launch for third time
Private rocket maker sends remote-sensing satellite into orbit
Sols 3932-3933: Touch and Go, Go, Go!
Scientists proposed to adapt a Mars ISRU system to the changing Mars environment
Mars helicopter Ingenuity completes 56th flight
Photocatalytic CO2 conversion for artificial carbon cycle at extraterrestrial sites
From rice to quantum gas: China's targets pioneering space research
China to launch "Innovation X Scientific Flight" program, applications open worldwide
Scientists reveal blueprint of China's lunar water-ice probe mission
Shenzhou 15 crew share memorable moments from Tiangong Station mission
Momentus announces reverse stock split|
LeoStella and Hera Systems Establish Strategic Alliance
Viasat provides status update on Inmarsat-6 F2
Pentagon awards contracts for next 'swarm' of tiny missile defense satellites
Northrop Grumman delivers mini laser to US Government
NASA to demonstrate laser communications from Space Station
UNIDIR and SWF Introduce the Space Security Lexicon: Bridging the Gap in Space Terminology
Newly discovered planet has longest orbit yet detected by the TESS mission
Thermometer molecule confirmed on exoplanet WASP-31b
Accretion disks: How big are they really?
Study explains how part of the nucleolus evolved
SwRI will lead Hubble, Webb observations of Io, Jupiter's volcanic moon
In the service of planetary science, astrophysics and heliophysics
Mysterious Neptune dark spot detected from Earth for the first time
Neptune's Disappearing Clouds Linked to the Solar Cycle
|Subscribe Free To Our Daily Newsletters|