Jim leads the Multicore Design Evaluation team for Freescale's NMG/NSD division. Jim has 27 years of industry experience focused on distributed systems, microprocessor and SoC architecture, design verification, and optimization. Jim is an IEEE Senior Member, and is a board member for the Multicore Association. He is also chair of the Integrated Systems & Circuits Science area for the Semiconductor Research Corporation (SRC), and chair of the Multicore Resource API Working group for the Multicore Association. Jim earned a Ph.D. in Electrical and Computer Engineering from the
ESAThe Columbus Active Thermal Control System (ATCS) is the main thermal bus for the pressurized racks working inside the European laboratory. One of the ATCS goals is to provide proper water flow rate to each payload (P/L) by controlling actively the pressure drop across the common plenum distribution piping. Overall flow measurement performed by the Water Pump Assembly (WPA) is the only flow rate monitor available at system level and is not part of the feedback control system. At rack activation the flow rate provided by the system is derived on ground by computing the WPA flow increase. With this approach, several anomalies were raised during these 3 years on-orbit, with the indication of low flow rate conditions on the European racks FSL, BioLab, EDR and EPM. This paper reviews the system and P/Ls calibration approach, the anomalies occurred, the engineering evaluation on the measurement approach and the accuracy improvements proposed, the on-orbit test under evaluation with NASA and finally discusses possible short and long term solutions in case of anomaly confirmation.
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