Crew water loop & resupply

Steady-state crew water balance: potable, hygiene and electrolysis demand vs urine / condensate recovery, loop closure and resupply (makeup) mass for a mission: ISS-class BVAD defaults.

SIDUS educational calculator. Category crew. Tags: crew, ECLSS, ISS, logistics, resupply, water. Pure SI. Not flight software.

Formula

m = max(0, ṁ_dem − ṁ_rec) · N · t

Crew water loop resupply

Primary sources

• Life Support Baseline Values and Assumptions Document (NASA/TP-2015-218570 Rev2) (NASA): Per-crewmember-day water usage and wastewater planning values (Tables 4-20 / 4-21).
• NASA Achieves Water Recovery Milestone on International Space Station (NASA): Public ISS water recovery figures (UPA, WPA, Brine Processor Assembly, ~98% total recovery).
• NASA-STD-3001 (Human Spaceflight standards overview) (NASA): Human-system standards context (ppO₂ / atmosphere). SIDUS flags are educational. They are not flight-rule substitutes.
• ISS ECLSS overview literature (NASA ISS program (public summaries)): Public ISS life-support system context for educational O₂/CO₂/thermal models: not a flight-rule substitute.

How do AI agents use this tool?

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.