ATCS Re-Certification Test: The Investigation of Columbus MT Loop Performances Close and Beyond Its Maximum Operative Limits 2006-01-2164
The Moderate Temperature (MT) Columbus Active Thermal Control Subsystem (ATCS) has been conceived to collect all the waste thermal loads generated in the various Columbus Module Subsystems and in the ISPR Payloads and reject them through the NODE 2 (Water/Ammonia) Inter-Loop Heat Exchangers providing a controlled and stable cooling resource to the experiments with the help of temperature and delta pressure control laws. The maximum amount of ATCS mass flow rate, actively modulated and shared among the different loop segments, depends on the total thermal head to be controlled and rejected.
A deep and wide study - ATCS Re-Certification - was undertaken to increase the cooling resources offered to the ISPR Payloads. Starting from the already base lined total cooling mass flow rate of about 950 [kg/h], the capability to reach flow figure of 1050 [kg/h] was carefully investigated.
Scope of this paper is to describe a test campaign - ATCS Re-Certification Test - performed with the ATCS loop in its final Flight Configuration and the relevant analytical experimental data assessment.
The test campaign objectives were: better characterize in terms of hydraulic performance the COF MT loop for operative conditions close and beyond the former nominal boundaries and to provide experimental data for the final tuning of the Thermal-Hydraulic Mathematical Model THMM (ESATAN-FHTS coded) in the highest Flow Rate and Water Pump provided prevalence area.