- completed
[LHPR]
On-orbit demonstration experiments for thermal control technologies required for implementing competitive next-generation geostationary communications satellites
- Technology
ISS Science for Everyone
SCIENCE OBJECTIVES FOR EVERYONE
The Loop Heat Pipe Radiator (LHPR), is an advanced two-phase heat transfer device that utilizes the evaporation and condensation of a working fluid to transfer heat, and the capillary force to circulate the fluid. This investigation demonstrates the heat transfer performance/functions under microgravity conditions using the LHPR experimental apparatus, which is grappled by the JEM Remote Manipulator System (JEMRMS). This technology can be applied in the thermal control system of future satellites that generate large amounts of heat that could negatively affect satellite operations.
Experiment Description
RESEARCH OVERVIEW
The Loop Heat Pipe Radiator (LHPR) demonstrates the heat transfer performance/functions under microgravity conditions. This technology can be applied to the thermal control system of future satellites that generate large amounts of heat. The LHPR has an attached reservoir containing an excessive working fluid that enables the control of operating temperature and the shut-down function. As compared to other heat transfer devices, the major advantages of the LHPR are its small size, high reliability, and higher heat transfer capability. These advantages make the LHPR a desirable technology for use in future exploration missions beyond low-Earth orbit.
Applications
SPACE APPLICATIONS
Adequate heat rejection systems are required for both future space exploration vehicles and manned spacecraft. The Loop Heat Pipe (LHP) Radiator technology contributes to realize compact, efficient heat rejection system. It also contributes to realize a LHP-based deployable radiator which is required in near-future large satellite with high heat generation.
EARTH APPLICATIONS
Lessons learned from the Loop Heat Pipe Radiator could also enable this technology to be used on Earth in a variety of industries to reject heat from different industrial and/or mechanical processes.
Operations
OPERATIONAL REQUIREMENTS AND PROTOCOLS
LHPR is launched to the International Space Station (ISS) aboard HTV-7. After arrival at ISS, LHPR is fastened to the Multi-Purpose Experiment Platform (MPEP), and MPEP is attached to the JEM Airlock Slide Table by the ISS crew members. LHPR/MPEP is transferred to external area through the airlock (A/L), grappled by JEMRMS, and maneuvered to LHPR mission position. After completion of the mission, LHPR/MPEP is returned to the habitable area through A/L.
Publications
PRINCIPAL INVESTIGATOR(S)
JAXA
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