View: https://x.com/TitaniumSV5/status/1746737267203621212
Tender Document
https://eproc.vssc.gov.in/common/vi...300022301&id=ff8081818c6d2b13018caf540fb61586
1/n (Gaganyaan ECLSS tender document)Environmental Control and Life Support System (ECLSS) consists of:Thermal & Humidity Control System (THCS) Cabin Pressure Control System (CPCS) Air Revitalization & Trace Contaminant Control System (ARS)ECLSS Control system #ISRO
2/n
The Environment control and life control system has to cater to 3 crew for 7-day mission. The cabin specifications considering the human physiological requirements and comfort are as follows:
3/n Schematic of the ECLSS system:
4/n Total volume of Gaganyaan crew module cabin is 6.7㎥.Cabin air volume is 4.8㎥.Optimal cabin temperature - 23 ± 3˚C (prechilled to 18 ˚C before ascent and deboost)Relative humidity - 30-70%Nominal cabin pressure - 101kPa
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5/n ECLSS duty cycle duration rating -In-orbit - 7 days Pre-launch - 2.5hoursAscent to orbit - 20min Descent from orbit - 50min Emergency time safety margin:In-orbit - 130min Descent - 50min Total - 180min
6/n Open loop ECLSS for a duration up to 7 days supporting 3 crew for LEO orbit of 400 km. System shall be modular which can be scaled for different mission duration 3-7 days and number of crews from 1-3.
7/n Crew activities required for ECLSS functioning:
8/n Redundancy in systems including crew intervention.System which will generate O2 and remove CO2 in case Cabin Ventilation Unit (CVU) is not operational.
9/n Triple redundancy with FDI and re-configuration logic for sensors and electronics – Detailed FDI algorithm shall be generated.Provision for crew override/manual operation for mechanical systems. Provide real time display/warnings to crew about critical parameters.
10/n Thermal and Humidity Control System (THCS):Maintain thermal conditioning of the CM so as to ensure crew health and comfort and to ensure that all systems/ equipment can be maintained within their operating temperature envelopes by removing or adding sensible heat.
11/n The main function of cabin thermal control system is to maintain the cabin temperature within 23± 3C (Nominal) and relative humidity 30 to 70%. The equipment temperature shall be maintained using cold plate. Electronic equipment mounted on the cold plate<45°C)
12/n It shall be able to accept thermal energy from crew and components(includes electronic components, pumps, heat exchangers, fans & cold plates).Transport the thermal energy from heat source (CM) to heat sink (SM radiators) using close loop mechanically pumped system.
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