L2-WTR-MELT CRITICAL RESOURCES Level 2 · hardware

Ice Melting & Heating

ice_melting_heating_system

Thermal extraction system that heats ice-bearing lunar regolith to liberate water vapor, then condenses and collects liquid water for downstream processing.

Purpose

Convert frozen water ice trapped in lunar regolith into liquid water, the first step in the water processing chain.

Context

Operates at or near permanently shadowed regions where temperatures are as low as 40 K, requiring significant thermal energy input to sublime and capture water from regolith matrix.

Principles

▸Water ice in regolith sublimates at temperatures above ~160 K in vacuum
▸Thermal extraction requires heating regolith to 100-200 C for efficient release
▸Microwave heating can penetrate regolith for volumetric energy delivery
▸Cold traps capture sublimated water vapor for condensation
▸Batch processing allows regolith cycling: heat, extract, dump, reload

Typical implementations

▸Enclosed retort chambers with resistive or RF heating elements
▸Microwave emitters for in-situ regolith heating
▸Cold-finger condensers to capture water vapor
▸Vacuum-sealed auger transport for regolith handling
▸Heat recovery systems to preheat incoming regolith

Lunar considerations

▸PSR temperatures as low as 40 K require enormous delta-T heating
▸Vacuum sublimation means water goes directly from ice to vapor
▸Regolith dust management critical in feed and discharge systems
▸Solar power unavailable in PSRs, requiring nuclear or beamed energy
▸Volatile contaminants (CO2, NH3, H2S) co-released with water

Specifications

Functional

primary function	Thermally extract water from ice-bearing lunar regolith and condense it into liquid form
inputs	ice_bearing_regolith, electrical_or_thermal_power
outputs	raw_liquid_water, spent_regolith, volatile_gases
water extraction efficiency	>90% of contained ice recovered
processing temperature	100-200 C
volatile separation	water separated from CO2, NH3, H2S

Physical

materials	stainless_steel_retort, ceramic_insulation, RF_heating_coils, cold_trap_condensers
operating location	near PSR or within pressurized processing module
input temperature	40-100 K from PSR regolith
output temperature	near ambient for liquid water collection

Operational

thermal range c	-173, 127
lifetime years	100

Interfaces

Provides

→Water Purificationraw_watercritical
Extracted liquid water containing dissolved contaminants
→L0-ARKvolatile_gasessupporting
CO2, NH3, and other volatiles for potential use

Requires

←L0-ARKice_bearing_regolithcritical
Mined regolith from PSR containing water ice
←L0-ARKelectrical_powercritical
Heating energy for regolith processing