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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Potassium condensing tests of horizontal multitube convective and radiative condensers operating at vapor temperatures from 1250 to 1500 degrees F
Potassium condensing tests of horizontal multitube convective and radiative condenser operating at vapor temperatures
Analysis of fin-tube condenser radiator designs for Rankine cycle space electric power system
Nonredundant direct condensing finned-tube space radiator for 1-mw rankine electric power generation, considering also meteoroid protection
Analysis of a megawatt level direct condenser- radiator for space power system
Space radiator-condenser design and performance analysis computer programs - users manual
Steady state performance of multitube, centrally finned, potassium condensing radiator
Thermophysical properties of working fluids and tube, header, and fin materials and compatibility analysis for design of space electric power radiator-condenser systems
Computer program for analysis of Apollo type fuel cell cooling loops
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A well-resolved two-dimensional nonlinear numerical simulation of the radiative/thermal instability in a sheared magnetic field is described which leads to filament formation. The condensation is initiated by a linearly unstable mode and widens until it is slowed by thermal conduction parallel to B. During the nonlinear evolution, the minimum temperature falls from 10 to the 6th K to 10 to the 4th K and eventually reaches a state of local thermal equilibrium in about five e-folding times.
Liquid metal radiator and condenser test facility
Radiative properties of solid condensed gases with respect to cryodeposits
Sensitivities of condenser, radiator, and pump bypass temperature controls to control flow
Design studies of condensers and radiators for cesium and potassium vapor cycle space power plants
ATLAS Laser Thermal Control System (LTCS) thermal vacuum testing where the condenser-radiator was placed in a vertical position, it was found that the loop heat pipe (LHP) reservoir required much more control heater power than the analytical model had predicted. The required control heater power was also higher than the liquid subcooling entering the reservoir using the measured temperatures and the calculated mass flow rate based on steady state LHP operation. This presentation describes the investigation of the LHP behaviors under a gravity assist mode with a very cold radiator sink temperature and a large thermal mass attached to the evaporator. It is concluded that gravity caused the cold liquid to drop from the condenser-radiator to the reservoir, resulting in a rapid decrease of the reservoir temperature. When the reservoir temperature was increasing, a reverse flow occurred in the liquid line, carrying warm liquid to the condenser-radiator. Both events consumed the reservoir control heater power. The fall and rise of the reservoir temperature also caused the net heat input to the evaporator to vary due to the release and storage of the sensible heat of the thermal mass. The combination of these effects led to a persistent reservoir temperature oscillation and a repeated influx of cold liquid from the condenser. This was the root cause of the extraordinary high control heater power requirement in the LTCS TV test. Without gravity assist, such a persistent temperature oscillation will not be present.
Weight of partially segmented direct condenser radiator for large space power supply systems
Direct condensing and indirect radiators for nuclear potassium Rankine systems