L2-ISR-ICE ESSENTIAL RESOURCES Level 2 · hardware

Ice Mining System

Thermal Ice Extraction & Sublimation Capture Subsystem

The thermal ice extraction and sublimation capture subsystem extracts water ice bound in lunar regolith within permanently shadowed regions by heating the material to drive off water vapor and recapturing it in cold-trap condensers. Operating in permanent darkness at ambient temperatures of 40 to 110 K, the system must raise regolith temperatures above 150 K to induce sublimation. Because lunar surface pressure is roughly 10^-12 torr, unsealed water vapor escapes instantly to vacuum. Heating efficiency is further constrained by the regolith’s extremely low thermal conductivity of approximately 0.01 W/mK, requiring sealed heating chambers to thermally separate and capture the 5 to 22 weight-percent ice fraction.

Thermal extraction of water ice from PSR regolith via heating, sublimation, and vapor capture

Purpose

Liberate water ice from regolith in Permanently Shadowed Regions through controlled heating, capture the sublimated water vapor before it escapes to vacuum, and deliver collected water to L1-WTR for processing into potable water, O2, and H2

Context

L2-ISR-ICE operates in the harshest environment of any Ark subsystem — PSR cold traps at 40-110K in permanent darkness. Water ice at 5-22 wt% is intimately mixed with regolith particles and must be thermally separated. Sublimation occurs directly from solid ice to vapor at these pressures (~10^-12 torr), requiring sealed heated enclosures with cold-trap condensers to capture vapor before it is lost to the lunar vacuum.

Principles

▸Water ice sublimates directly to vapor at lunar surface pressures (~10^-12 torr) when heated above ~150K
▸Thermal mining heats regolith in enclosed chambers to drive off ice as vapor while retaining solid material
▸Cold-trap condensers downstream of heated zones recapture water vapor as frost or liquid
▸Energy required: ~2.6 MJ/kg to sublimate ice + sensible heating of regolith mass
▸Higher ice concentrations (>10 wt%) yield dramatically better energy efficiency per kg water

Typical implementations

▸Heated tent / dome enclosure placed over ice-bearing regolith (Colorado School of Mines concept)
▸Auger-fed heated retort with enclosed vapor collection
▸Microwave heating of regolith to selectively heat water molecules
▸Focused solar or electrical radiant heating panels in sealed enclosures

Lunar considerations

▸PSR temperatures (40-110K) require significant energy to heat regolith to sublimation temperatures (>150K)
▸All operations in permanent darkness — no solar energy available at mine face
▸Ultra-high vacuum means any unsealed system loses water vapor instantly to space
▸Regolith thermal conductivity is very low (~0.01 W/mK) — heating is slow and localized
▸Ice may exist as thin coatings on grains, interstitial fills, or discrete lenses — each requires different extraction approach

Specifications

Functional

primary function	Extract water ice from PSR regolith through thermal processing and vapor capture
inputs	Ice-bearing regolith (5-22 wt% H2O) from L2-ISR-EXC or direct in-situ heating, Electrical power for heating elements, Containment structures and cold traps
outputs	Collected water (liquid or frost) to L2-ISR-TRANS for delivery to L1-WTR, De-iced regolith (dry) to L2-ISR-BEN for mineral processing, Co-released volatiles (CO, H2, He-3) to L2-ISR-VOL
water extraction rate kg per hour	5
capture efficiency percent	95
energy per kg water kWh	3.5
operating temperature k	150-400 (heated zone)
availability	0.9

Physical

materials	Stainless steel heating chambers, Nichrome or SiC heating elements, Aluminum cold-trap condenser surfaces, Kapton/MLI thermal insulation
temperature range c	-233 to +127 (ambient PSR to heated chamber)
radiation	Minimal in PSR (shielded by crater walls from solar)
dust	Ice-bearing regolith in direct contact with heating surfaces

Operational

power consumption w	2000
thermal range c	-233, 127
lifetime years	100
mtbf hours	6000

Interfaces

Provides

→Water Processingmaterialessential
Collected water ice/liquid from sublimation capture for purification and electrolysis
→Beneficiation and Sortingmaterialsupporting
De-iced dry regolith still containing useful minerals for beneficiation
→Volatile Capture Systemmaterialsupporting
Co-released volatiles (CO, H2, He-3) captured during thermal extraction
→Mining Control Systemdataessential
Extraction rates, temperatures, vapor pressures, ice yield per batch

Requires

←Excavation Systemmaterialessential
Ice-bearing regolith excavated from PSR deposits and loaded into heating chambers
←Power Generation Systempowercritical
Electrical power (~2 kWe) for regolith heating elements and vapor collection systems
←Active Thermal Control Systemthermalessential
Cold-side thermal management for condenser surfaces and heated-zone insulation
←Mining Control Systemdataessential
Heating profiles, batch scheduling, and extraction mode commands