Thermal behavior of a cryogenic loop heat pipe for space application

► The cooldown is achieved efficiently thanks to the secondary circuit even in a severe radiation environment. ► A maximum cold power of 19W is transferred with a corresponding limited temperature difference. ► A small heating power applied on the shunted cold reservoir allows to maintain a constant subcooling, thus the system behaves as a capillary pumped loop. ► The radiation heat loads may affect significantly the thermal response of the system. This paper discusses a prototype of cryogenic loop heat pipe (CLHP) working around 80K with nitrogen as the coolant, developed at CEA-SBT in collaboration with the CAS/TIPC and tested in laboratory conditions. In addition to the main loop it features a pressure reduction reservoir and a secondary circuit which allow cooling down the loop from the room temperature conditions to the nitrogen liquid temperature and transferring the evaporator heat leaks and radiation heat loads towards the condenser. The general design, the instrumentation and the experimental results of the thermal response of the CLHP are presented, analyzed and discussed both in the transient phase of cooling from room temperature (i) and in stationary conditions (ii). During phase (i), even in a severe radiation environment, the secondary circuit helped to condense the fluid and was very efficient to chill the primary evaporator. During phase (ii), we studied the effects of transferred power, filling pressure and radiation heat load for two basic configurations of cold reservoir of the secondary circuit. A maximum cold power of 19W with a corresponding limited temperature difference of 5K was achieved across a 0.5m distance. We evidenced the importance of the filling pressure to optimize the thermal response. A small heating power (0.1W) applied on the shunted cold reservoir allows to maintain a constant subcooling (1K). The CLHP behaves as a capillary pumped loop (CPL) in such a configuration, with the cold reservoir being the compensation chamber of the thermal link. The radiation heat loads may affect significantly the thermal response of the system due to boiling process of liquid and large mass transfer towards the pressure reduction reservoir.