NDLI: Columbus payloads flow rate anomalies

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Columbus payloads flow rate anomalies

Content Provider	NASA Technical Reports Server (NTRS)
Author	DePalo, Savino Bufano, Gaetana Quaranta, Albino Holt, James M. Palumberi, Sergio Szigetvari, Zoltan Hinderer, S.
Copyright Year	2011
Description	The 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.
File Size	809557
Page Count	13
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110011710
Archival Resource Key	ark:/13960/t9g49pk09
Language	English
Publisher Date	2011-01-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Transducers Computational Fluid Dynamics Flowmeters Thermohydraulics Flow Velocity Water Flow Temperature Control Heat Exchangers Automatic Control Valves Payloads Anomalies Ultrasonics Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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