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In the scope of the COLUMBUS-preparatory support technology programme, funded and coordinated by the European Space Agency (ESA/ESTEC), critical components of a mechanically pumped two-phase heat transport system, i.e. evaporator cold plate, evaporative heat exchanger, vapour quality sensors, condenser, accumulator, gas trap and control system, have been identified and developed by a number of European companies under Dornier-subcontract. A comprehensive test programme, focussed on the investigation of critical components performance characteristics and limits, has generally demonstrated very satisfactory and partially even excellent results. However, experience gained during test performance as well as overall test evaluation have concluded in several recommendations for further analysis, improving modifications and a continuation of testing aimed at an enhancement of European two-phase technology know-how.