Life support resource amounts
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Convert from Human consumption rates to Kerbal consumption ratesNote that all calculations use 1 in-game unit = 1 liter
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Assumptions:kg
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NASA's EVA suit used on board the ISS weights 145 kg fully loaded.145http://en.wikipedia.org/wiki/Extravehicular_Mobility_Unit#Enhanced_EMU
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The Manned Maneuvering Unit (MMU) weights 148 kg fully loaded148http://en.wikipedia.org/wiki/Manned_Maneuvering_Unit#Overview
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The typical NASA astronaut weights 154 lbs (70 kg)7019.28%http://ston.jsc.nasa.gov/collections/trs/_techrep/CR-2004-208941.pdf<- Table 3.3.6Older sources seem to say 80 kg, newer sources (ISS and after) seem to say 70 kg.
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Total363
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Kerbals are 0.8 m tall, compared to 1.8 m for humans
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Kerbal suits come equipped with an MMU
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A Kerbal on EVA weights 0.09 tons (90 kg) in game90http://wiki.kerbalspaceprogram.com/wiki/EVA
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Total90
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Kerbal mass
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If the mass of the Kerbal's EVA suit is linearly proportional to NASA's19.28%17.4#1
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Assuming Kerbals are 1/2 as tall, 1/2 as wide, and 1/2 as fat, and the same density12.50%8.8#2
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Arbitrary value somewhere in between those15.71%11.0#3Chosen to make the consumption ratio below be 25%11.02430919
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Food consumption ratio, using Kleiber's lawhttp://equation-of-the-month.blogspot.it/2012/06/kleiber-law.html
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humansbasal metabolic rate, R=M^3/424.200
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Kerbalsmass #18.50335.14%
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mass #25.08821.02%
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mass #36.04024.96%
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Conclusion
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Kerbals mass11.00kg24.20lbs
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Consumption ratio25.00%
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Consumption, units, mass, and volume
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Oxygenkg/m^3kg/L
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Density (gas)1.410.00141@ 0Â°C / 100 kPahttp://www.wolframalpha.com/input/?i=oxygen+at+0C+and+100+kPahttp://en.wikipedia.org/wiki/Oxygen
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As compressed gas311.80.3118@ 0Â°C / 20 MPa (~197.4 atm)ratio221.1347518http://www.wolframalpha.com/input/?i=oxygen+at+0C+and+200+bar
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As liquid11411.141@ -184.03Â°C / 100 kParatio809.2198582http://www.wolframalpha.com/input/?i=liquid+oxygen+at+100+kPahttp://en.wikipedia.org/wiki/Oxygenhttp://www.engineeringtoolbox.com/oxygen-d_1422.html
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Human consumption
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0.835kg/Earth-dayhttp://ston.jsc.nasa.gov/collections/trs/_techrep/CR-2004-208941.pdf<- Table 3.3.6http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120015507.pdf<- slide 3
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592.198582L/Earth-day
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0.00685415024954L/sec
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2.677999L/Earth-day (compressed)
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0.731814L/Earth-day (liquid)
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Kerbal consumption
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0.20875kg/Earth-day25.00%of human consumption
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0.0521875kg/Kerbin-day
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37.012411L/Kerbin-day
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0.001713537562385L/sec
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0.167375L/Kerbin-day (compressed)
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0.045738L/Kerbin-day (liquid)
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Cost
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0.000055836K\$/LArbitrary value chosen to make the K\$/kg price be slightly higher than Oxidizer
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0.0396K\$/kgOxidizer is 0.005 tons/L or 5 kg/L and costs 0.18 K\$/L for0.036K\$/kg
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0.033066K\$/Earth-dayReal life price is \$3.00 per kghttp://www.chemicool.com/elements/oxygen.html
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0.002066625K\$/Kerbin-day
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Food
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kg/Earth-daym^3 volume
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Human consumptionhttp://ston.jsc.nasa.gov/collections/trs/_techrep/CR-2004-208941.pdf<- Table 4.3.7also see 4.3.1 and 3.3.6 and 4.3.4
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Dry mass0.66also seehttp://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120015507.pdfhttp://www.projectrho.com/public_html/rocket/supplement/102202_LifeSupportPart1.pdfhttp://www.nasa.gov/pdf/146558main_RecyclingEDA(final)%204_10_06.pdfhttp://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20140005433.pdfhttp://www.agrospaceconference.net/sperlonga2006/07%20Wheeler%20-%20NASA%20research.pdf
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Food "as-shipped"1.3752% water0.7124kg water-0.0024http://en.wikipedia.org/wiki/Life_support_system#Human_physiological_and_metabolic_needshttp://www.nasa.gov/audience/foreducators/stseducation/materials/Sustaining_Life.html
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Rehydrated food "as-consumed"2.38
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Packaging mass0.2417.52%
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Food locker mass0.250.0035418.25%volume is the space taken up by the food including packaging "as-shipped". 50% is provided frozen.
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Freezer mass0.8080.0023158.98%
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Trash mass0.29
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Rehydration water1.01
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Total water needed2.163
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Total water consumed2.8754
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Total Storage1.0580.0058564.35%
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Food "as shipped" w/packaging1.64402kg/Earth-dayAdded 0.03402 kg/day because the numbers were not coming out right. Should be "total in == total out" :(
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Food density "as-shipped" including packaging281.02905982906kg/m^3Storage
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0.28102905982906kg/L64.35%% kg/Earth-day
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1.55389414multiplier
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Food volume consumed5.85L/Earth-day
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0.000067708333333L/sec
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Kerbal consumption
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Food "as shipped" w/packaging0.411005kg/Earth-day25.00%
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0.10275125kg/Kerbin-dayStorage
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Food volume consumed0.365625L/Kerbin-day64.35%% kg/Kerbin-day
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0.000016927083333L/sec1.55389414multiplier
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Storage0.066125kg/Kerbin-day
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Cost
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0.238874700854701K\$/L
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0.85K\$/kgArbitrary value
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1.397417K\$/Earth-day
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0.0873385625K\$/Kerbin-day
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