Analytical Methods Used in the Design of Thermal Toolbox Elements for Extreme Environments

This paper describes the analytical methods used in the design/development of new thermal toolbox elements for science payload operation/survival in extreme environments. These new thermal tools were developed as a result of five JPL projects (PALETTE, ARTEMIS, ROD-TSW, ES-ROD-TSW, and mini-ROD-TSW) and include thermally-switched enclosures (TSE), parabolic reflector radiators (PRR), spacerless multilayer insulation (SMLI), low conductance thermal isolators (LCTI), 3 types of reverse-operation DTE thermal switches (ROD-TSW), miniaturized loop heat pipes (mini-LHP), Vectran tension cables (VTC), and wire heat leak minimization (WHLM) techniques. The analytical methods are used to predict key performance parameters (KPPs) associated with each thermal tool. The KPPs include TSE lunar night heat loss flux (qLOSS), PRR lunar noon radiative sink temperature (TS), SMLI effective emissivity (*), LCTI thermal conductance (G), ROD-TSW/mini-LHP ON/OFF behavior, VTC structure stiffness and frequency (k and ), and WHLM heat loss. The paper also describes thermal toolbox mission infusion status.