Microwave Volatile Extraction Through Hollow Augers in Regolith
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Solution Overview
Problem
Current methods for extracting volatiles from planetary bodies in space face challenges due to low heat transfer in vacuum conditions and porous regolith, which limits the effectiveness of surface heating in liberating subsurface volatiles, and require significant resources and energy for propellant transportation.
Innovation Solution
A system utilizing microwave energy delivered through a hollow auger or drill to penetrate the regolith and heat subsurface layers, allowing volatiles to sublime and be collected using a cold trap, reducing the need for surface excavation and energy-intensive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If surface heating methods are used to extract volatiles from planetary bodies, then the process is simpler to implement, but heat transfer efficiency is low due to vacuum conditions and porous regolith
Solution Approach 1:
The patent replaces conventional thermal conduction heating with microwave electromagnetic radiation heating. The microwave heating element delivers energy directly to subsurface regolith through the hollow drill shaft, bypassing the inefficient surface heat transfer pathway. This substitution of heating mechanism resolves the contradiction by achieving high heat transfer efficiency without sacrificing ease of implementation, as the microwave system integrates directly into the drilling operation.
Solution Approach 2:
The hollow drill shaft serves as an intermediary medium that conducts microwave energy from the surface equipment down to the subsurface regolith. This intermediary allows the heating energy to reach the target zone efficiently through the vacuum and porous regolith layers, resolving the heat transfer efficiency problem while maintaining the simplicity of surface-based operation.
2Device complexity
If surface heating is used to liberate subsurface volatiles, then equipment complexity is reduced, but energy consumption increases significantly
Solution Approach 1:
The microwave heating system replaces energy-intensive surface heating methods with targeted subsurface microwave irradiation. The microwave energy is delivered directly to the regolith at depth, reducing the total energy required to reach the volatiles. This substitution maintains relatively simple equipment while dramatically reducing energy consumption compared to surface heating methods that must heat entire surface layers.
Solution Approach 2:
The system applies heating locally at the subsurface target zone rather than heating the entire surface area. The microwave energy is concentrated in the regolith surrounding the hollow drill shaft, creating a localized heating zone that efficiently liberates volatiles without wasting energy on surrounding areas. This local quality approach reduces overall energy consumption while keeping equipment complexity manageable.
3Use of energy by moving object
If microwave energy is delivered through hollow auger or drill, then subsurface heating efficiency improves, but device complexity increases
Solution Approach 1:
The hollow drill shaft serves multiple functions: it acts as both the drilling structure for penetrating the regolith and as the waveguide for delivering microwave energy to the subsurface target. This multi-functionality integrates the heating delivery system into the existing drilling operation, improving subsurface heating efficiency without adding separate complex heating equipment.
Solution Approach 2:
The patent merges the drilling function and microwave delivery function into a single integrated system. The hollow shaft that would normally just transport drill cuttings is instead used as the microwave transmission medium. This merging of functions achieves efficient subsurface heating while avoiding the complexity of separate drilling and heating systems.
4Weight of moving object
If in-situ resource utilization is implemented, then mass of resources needed for transportation is reduced, but technology complexity increases
Solution Approach 1:
The system extracts volatile substances directly from the planetary body's regolith at the mission site. By taking out the needed resources (water, methane, oxygen, etc.) in-situ rather than transporting them from Earth, the mass of resources requiring transportation is dramatically reduced. The microwave heating and volatile collection technology enables this extraction without requiring complex processing facilities.
Solution Approach 2:
The system uses the planetary body's own regolith as the resource source, making the mission self-sufficient. The hollow drill shaft penetrates the local regolith, microwaves heat it to release volatiles, and the collection system captures these substances for immediate use. This self-service approach reduces transportation mass while keeping technology complexity relatively low by utilizing available local materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach efficiently extracts volatiles from planetary bodies by penetrating deep into the regolith, reducing the mass of resources needed for transportation and extending spacecraft mission duration through in-situ resource utilization, while minimizing energy consumption and potential damage from surface heating.
Implementation Method 1
a microwave energy source for delivering microwave energy to the hollow auger
Implementation Method 2
allowing volatiles to sublime and be collected using a cold trap
Implementation Method 3
a condensation apparatus coupled to said drilling structure to receive said volatile substance from said drilling structure, said condensation apparatus for condensing said volatile substance for concentration and storage of said volatile substance
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A system for extraction of volatiles from bodies in a vacuum. The volatile containing solid may be subsurface heated with microwave or RF energy subliming volatiles that are captured with a containment structure that directs the flow of the volatile through a cold trap for collecting and condensing the volatile. In one variation, a sample, or an entire body may be enveloped in a sealed container for extraction of volatiles that are then collected and condensed. In a further variation, a planetary surface area is covered and the perimeter sealed at the surface. The area is then heated from above to release volatiles that are then collected and condensed. To heat layers below the surface that contain high concentrations of volatiles, a hollow auger can gain access to the subsurface volatile and microwave or RF energy can be delivered down the hollow auger with a coax cable and vapor can escape through the hollow auger to a capture apparatus.