ESA Document - Emits - ESA

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3.3.2.1 Requirements and design drivers
HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 155 of 422
The metabolic needs of the crew have been calculated using the correlations given in ESA
standard PSS-03-406 and crosschecked with relevant sources. The entire calculations have been
based on the energy expenditure of the crew. The schedule for crew activity is shown in Table
3-11. EVA has not been considered because it shall be a kept to a minimum during the
interplanetary mission phase and would negatively influence the energy estimate by
overestimating the needs.
Activity (hours) Astronaut
1 2 3 4 5 6
Sleep 8 8 8 8 8 8
Pre- and post sleep 5 5 5 5 5 5
Leisure activities 0 0 0 0 0 0
Personal hygiene 1 1 1 1 1 1
Eating 2 2 2 2 2 2
Exercise 1.3 1.3 1.3 1.3 1.3 1.3
Station keeping 4.7 4.7 4.7 4.7 4.7 4.7
Laboratory activities 2 2 2 2 2 2
EVA mission tasks 0 0 0 0 0 0
EMU donning/doffing 0 0 0 0 0 0
Egress/ingress 0 0 0 0 0 0
Pre-EVA setup & post EVA EMU care 0 0 0 0 0 0
TOTAL TIME (24hrs) 24 24 24 24 24 24
Table 3-11: Crew Activity Schedule during Earth-Mars transits and in orbit around Mars
Based on the energy expenditure, the metabolic needs and products by the crew have been
estimated. They are shown in Table 3-12:
Per day Per mission
Total metabolic needs
Energy consumption (W*h) 18 053 17 385 078
Energy consumption (MJ) 65.0 62 587
Oxygen consumption (m 3 ) 3 3120
Oxygen consumption (kg) 5 4458
Drinking water (m 3 ) 0 16
Drinking water (kg) 17 16424
Dry food (kg)
Total waste production
4 3894
Faeces (kg) 0 428
Carbon dioxide production (m 3 ) 3 2570
Metabolic water production (kg) 2 1842
Urine production (kg) 9 8902
Faecal liquids (kg) 0 462
Insensible water (kg)
Additional informtion
9 8902
Hygiene water (kg) 24 23112
Nitrogen (kg) 91
Table 3-12: Metabolic needs and products of the crew