ESA Document - Emits - ESA

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HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 387 of 422
Certain surfaces that cannot be protected by insulating means (docking system for the MAV) are
treated (oxidation anodic, alodine) to minimise heat losses. On the internal face, coils
(circulating fluid from primary loop) thermostatically control the temperature (condensation
avoidance) and the heat exchanges (control of the heat losses). An adequate redistribution of the
rejected heat (thermostatic coils) therefore reduces the use of heater power to the minimum.
4.5.5.4 Budget
4.5.5.4.1 Synthesis per subsystem (main features)
Primary loop
Secondary loop
Fluid loops
Pump assembly: 10 kg, 50W nominal (250 kg/hr) (x 2)
Condenser heat exchangers: 20.6 kg (x 1), cold plates: 3.4 kg (x 5), valves
(on/off, manual): 4 kg (x 10)
26 kg of tubing (dry including insulation, brackets) + 21 kg of water
Pump assembly: 6 kg, 30W nominal (x 2)
Heat exchangers: 5 kg, cold plates: 3.4 kg (x 2), flow control valve: 10 kg
37.3 kg of tubing (dry including insulation, brackets) + 31kg of PMS
Passive thermal control
External radiator One radiator of 8 m2, weighting 43 kg (5.4 kg/m2)
Insulation 0 kg for the main body of the transfer vehicle: the thermal properties of the
MOD shield are exploited, the related budget transferred to structure.
50 kg are provisioned for specific external and internal elements insulation.
50 kg are provisioned as heat shield
Heating system 300W installed power (heating of the lines)
2 control units (1 on), each 6 kg, 29W when shell heaters are 100% duty
cycle
Thermal Protection System and underneath structure
Fairing
Composite structure (core honeycomb, carbon shell)
TBD mm of Norcoat (TPS), provision of 50 kg
Tanks
30 mm of basotect + goldenized kapton layer: TBD kg/m2
encapsulated structure (honeycomb TBD mm) + TBD mm Norcoat (TPS):
TBD kg per tank (x 4)
Table 4-58: Main features
4.5.5.4.2 Overall budget (as introduced to the system)