Long‐term Lunar and Martian surface systems present challenges to thermal system design, including changes in thermal load, and large changes in the thermal environment between Lunar (or Martian) day and night. For example, the heat sink temperature at the Lunar equator can vary from 210 to 315 K. The radiator must be sized to reject the design power at the maximum temperature, but must also be able to accommodate both the changing heat sink temperature, as well as changes in power. Variable Conductance Heat Pipe (VCHP) radiators were examined for the main reactor of a fission surface power system, as well as the cavity cooling radiator. A VCHP radiator was designed for Lunar Equator that is capable of maintaining a 16 K temperature drop with a 4% addition to overall mass. Without the VCHP the radiator would experience a 43 K drop in temperature. This design is also capable of handling turndown on the power without an effect to the outlet temperature. At Shackleton Crater, the temperature drop for a conventional heat pipe radiator is small enough that a VCHP is not beneficial at constant power. However, a VCHP will allow turndown ratios of 5:1 or more. A conventional radiator can not be turned down more than 2:1, without valves to bypass part of the radiator. VCHPs are also easier to start than conventional radiators, since the gas‐loading prevents sublimation from the evaporator when the condenser is frozen.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Variable Conductance Heat Pipe Radiators for Lunar and Martian Environments


    Contributors:

    Conference:

    SPACE, PROPULSION & ENERGY SCIENCES INTERNATIONAL FORUM: SPESIF‐2009 ; 2009 ; Huntsville (Alabama)


    Published in:

    AIP Conference Proceedings ; 1103 , 1 ; 57-66


    Publication date :

    2009-03-16


    Size :

    10 pages





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Variable Conductance Heat Pipe Radiators for Lunar and Martian Environments

    Anderson, W.G. / Ellis, M.C. / Walker, K.L. | British Library Conference Proceedings | 2009


    Variable Conductance Heat Pipe for a Lunar Variable Thermal Link

    Peters, Christopher / Hartenstine, John / Anderson, William et al. | AIAA | 2011


    Lunar and Martian Environmental Interactions with Nuclear Power System Radiators

    Perez-Davis, M. E. / Katzan, C. M. / Gaier, J. R. et al. | British Library Conference Proceedings | 1992


    Variable Conductance Heat Pipe Radiator for Lunar Fission Power Systems

    Muzyka, Bryan J. / Peters, Christopher J. / Stern, Theodore G. et al. | AIAA | 2013


    2011-5120 Variable Conductance Heat Pipe for a Lunar Variable Thermal Link

    Peters, C. / Hartenstine, J. / Anderson, W. et al. | British Library Conference Proceedings | 2011