ESA Document - Emits - ESA

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4.5.8.1 Requirements and design drivers
HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 394 of 422
The MEV complex consists of two main modules. The Surface Habitation Module (SHM) and
the Mars Ascent Vehicle (MAV). The study required both modules to be equipped with life
support systems, which are not interconnected.
The MAV life support system is designed to provide life support to a crew of three for 5 days.
The mission parameters and the size of the crew allow this study to use the Soyuz TM(A) design
as a reference point.
4.5.8.2 Assumptions and trade-offs
Metabolic Requirements of the Crew
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 Figure
4-122.
SCHEDULE IN HOURS FOR THE MOST ACTIVE DAY
ACTIVITY ASTRONAUT
1 2 3
sleep 8 8 8
pre- and post sleep 5 5 5
leisure activities 0 0 0
personal hygiene 1 1 1
eating 2 2 2
exercise 0 0 0
station keeping 8 8 8
laboratory activities 0 0 0
Metabolic Cost of EVA
EVA mission tasks 0 0 0
EMU donning/doffing 0 0 0
egress/ingress 0 0 0
pre-EVA setup & post EVA EMU care 0 0 0
TOTAL TIME (24hrs) 24 24 24
Figure 4-122: Crew Activity Schedule during Martian surface Stay
Based on the energy expenditure, the metabolic needs and products by the crew have been
estimated and are shown in Figure 4-123.
PER DAY PER MISSION
ENERGY CONSUMPTION (W*h) 8512.8 35753.8
ENERGY CONSUMPTION (J) 30646080 128713536
OXYGEN CONSUMPTION (m3) 1.5 6.4
OXYGEN CONSUMPTION (kg) 2.1827 9.1675
DRINKING WATER (m3) 0.0051 0.0214