Assessment of the Technical Characteristics of a Capillary Evaporator in Microgravity (Cemex) - 11.04.14
ISS Science for Everyone
Science Objectives for Everyone
CEM will test two capillary evaporators, the main part of the two-phase heat transfer loops used for thermal control in spacecraft.
Science Results for Everyone
Sponsoring Space Agency
Russian Federal Space Agency (Roscosmos)
ISS Expedition Duration
April 2006 - September 2006
Previous ISS Missions
Performance of thermodynamic analysis and assessment of the technical characteristics of the capillary evaporator. Assessment of proposed technologies of evaporators for future application in space conditions.
Capillary evaporator test performance aboard the ISS RS. The experimental equipment is a monoblock and consists of a capillary evaporator configured as a circuit (CPL1) and an electronic control unit. The capillary evaporator design uses a two-phase heat transfer loop, which is used to support satellite thermal control. The loop consists of an evaporator, cooler and reservoir connected by pipes. The heat generated in the evaporator is transferred by working fluid to the cooler section. The reservoir supports the temperature inside the loop and the required reserves of working fluid. The fans provide cooling of the capacitor. The electronic unit consists of a computer with a single-board microprocessor for data acquisition and regulation of the capillary evaporator power, as well as for setting an operating temperature in the reservoir. Water in amount of 20 ml will be used as a coolant.
The ISS test results provided a good and continued performance of a capillary evaporator with circumferentially microgrooved walls using deionized water as the working fluid. The found results provided evidence of good performance even with low capillary pumping pressure for overcoming the pressure drop along the liquid and vapor lines. It was also noted that this type of evaporator showed easier and faster restart capability than other existing capillary evaporators. (Bazzo 2014)
Bazzo E, Camargo HV, Reimbrecht EG, Berti LF, Santos PH. Ground and microgravity results of a circumferentially microgrooved capillary evaporator. Applied Thermal Engineering. 2014 October; 71(1): 169-174.
Ground Based Results Publications
Energia - Science Research on the ISS Russian Segment
Kit with CEM equipment consisting of the CPL block and Memory map CEM* (in cover). Image courtesy of Russian Space Agency (FSA).
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