Advanced Life Support Research and Technology Development Metric

Fixed masses, mostly equipment, and time dependent masses, mostly consumables,are identified separately and applied as appropriate to the mission. Note that the ISSbaseline for food is taken from Bourland (1998), though Hanford (1997) provides asimilar value.ISS ECLSS Mission Definition DataNumber of Crew 4 USOS onlyNominal Duration 3,650 days at the same site, or 10 Earth years.LocationLEOISS ECLSS Infrastructure CostsFactor Value Units CommentsMass Delivery Factor 2 kg packaged/kg unpackagedFor components requiring packaging(food and clothing)Pressurized Volume 0.015 m³/kg ISS common module;No shielding or secondary structuresPower 11.4 W/kg Nuclear power; Based on SP100 ProgramHeat Rejection 25.4 W/kgCrew Time 2 person•hr/kg A rough estimateDerived Costs for MissionEnergy 492.48 kWh/kgHeat Rejection 3,950.2 kWh/kgReferences: Hanford (1997) and Hanford and Ewert (1996).ISS Food and Clothing Componentskg/(person•day)Required Food (hydrated) 1.955Total Food Mass 3.910Clothing 1.4Packaged Clothing 2.8From Bourland (1998) and ISS Laundry Package. The dry weight value for ISS food is0.674 kg/(person•day) excluding packaging. The full mass of food includes moisture asISS food is not completely dehydrated.ISS ECLSS Physical Quantities Translated to Equivalent System Mass (ESM)EquipmentMass[kg ESM]ResupplyMass[kg ESM]AssumedVolume[kg ESM]ResupplyVolume[kg ESM]AveragePower[kW]AverageCooling[kW]CrewTime[kg ESM]TotalMass[kg ESM]2,031 119,808 18,059 6,641 621 269 457 147,8861.4% 81.0% 12.2% 4.5% 0.4% 0.2% 0.3%Physical mass (equipment/initial mass plus the resupply mass) equals 121,838 kg ESM andaccounts for 82.4% of the total equivalent system mass.