ESA Document - Emits - ESA

s
HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 166 of 422
The life support system should not be considered exhaustive. It is merely a list of major
components, which give an indication of what LSS mass has to be anticipated.
Note that that the list also includes hardware based on life support and crew accommodation
needs.
3.3.2.6.1 Budgets
The two system options presented have the following mass budgets:
Anticipated Technology
Mass consumables (t) 10.3
Mass system (t) 13.7
Today’s Technology
Mass consumables (t) 22.3
Mass system (t) 19.4
Table 3-18: Mass budgets
Two power modes, a day and a night power mode, were investigated during this study. The
power schemes are based on the power requirements of the equipment to achieve the optimal
mass throughput through the system. Further, when possible, the power needs were optimised to
provide a relatively even power requirement of the LSS independent of the time of the day to
simplify power generation, power conditioning and power storage. The results are shown in
Table 3-19:
Power
Power requirement day (kW) 10.1
Power requirement night (kW) 9.3
Table 3-19: Power budgets
Only a first estimate for the volume of the life support system has been achieved in the course of
the study. The internal volume requirement relates to the volume occupied by the ECLSS inside
the pressurised vessel, as opposed to the external volume requirement, which relates to the
volume needs outside the pressurised volume.
3.3.3 Thermal
Volume
Internal volume requirements (m 3 ) 49
External volume requirements (m 3 ) 7
Table 3-20: Volume requirements
Objective of this part is to assess in a limited extent the feasibility of a Mars transfer vehicle
thermal design and check the maturity / availability of the related technology to fulfill this
mission. A possible design is discussed as an example and its budget quantified to output the
constraints toward the system (mass and power budget).