Potential of a New Lunar Surface Radiator Concept for Hot Lunar Thermal Environments

Ochoa, Dustin A.; Vogel, Matthew R.; Trevino, Luis; Stephan, Ryan A.

doi:10.4271/2008-01-1960

Cited by 3 publications

(2 citation statements)

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“…As a consequence, converting or allowing the entire suit surface to act as a radiator has been suggested as a potential means of leveraging the local environment for thermal control, and thereby reducing water mass loss associated with EVAs [19][20][21]. In addition, concepts for terraced radiators [22], shielded radiators [23,24], or selectable branch flow radiators [25] have also been proposed. A full suit radiator concept was also extended to include the use of variable infrared (IR) electrochromic materials as radiator surface coatings to achieve active control of variable heat rejection rates [26].…”

Section: Introductionmentioning

confidence: 99%

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Characterizing a Transient Heat Flux Envelope for Lunar-Surface Spacesuit Thermal Control Applications

Hager¹,

Walter²,

Massina³

et al. 2015

Journal of Spacecraft and Rockets

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In this paper, a transient thermal simulation approach is used to characterize the heat flux and heat flux rates between the lunar surface and a moving spacesuit model. Five different lunar-surface settings are simulated with craters and boulders at three solar elevation angles (θ 2, 10, 90 deg). Heat fluxes and rates are evaluated for different parts of the suit and different characteristic tasks along a given path. The simulated paths are based on Apollo mobility studies. The results indicate that, at lower solar elevation angles, which imply lower lunar-surface temperatures, the thermal impact of surface features becomes more pronounced. In all simulated cases, and for more than 85% of the time, the infrared heat fluxes vary at rates below 20 W · m −2 · s −1 . The incidence versus magnitude of infrared heat flux rates follows a power law with a negative exponent. Smaller heat flux rates have a higher occurrence at lower surface temperatures, and vice versa. The created lookup tables with task, solar elevation angle, and incident heat fluxes can be used as a baseline in the design and sizing of thermal control hardware for moving objects on the surface of the Moon. Nomenclature

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Section: Introductionmentioning

confidence: 99%

“…As opposed to the common use of radiators on orbiting spacecraft, maintaining an effective attitude toward a deep-space sink is not practical for a radiator system located on an astronaut who is moving and working on the lunar surface [5,6,23].…”

Section: Introductionmentioning

confidence: 99%