Multi-stage thermal pathway with embedded hydrocarbon-coated rib geometry

A payload-cooling system, comprising:

• an aluminum payload chamber comprising an upper aluminum chamber plate and an aluminum internal rib assembly, the aluminum internal rib assembly extending into an interior payload volume and comprising a plurality of aluminum rib segments arranged to define a 2-by-4 segmented conduction grid within the interior payload volume;
• a hydrocarbon thermal control material coating disposed directly on the upper aluminum chamber plate and directly on the aluminum internal rib assembly, the hydrocarbon thermal control material coating comprising tetradecane;
• an outer polymer enclosure surrounding at least a portion of the aluminum payload chamber, the outer polymer enclosure comprising ABS;
• a thermoelectric cooling assembly mounted above the upper aluminum chamber plate, the thermoelectric cooling assembly comprising:
• a thermoelectric chip having a cold side and a hot side;
• and
• a cooling block thermally coupled to the cold side of the thermoelectric chip and thermally coupled to the upper aluminum chamber plate to conduct cooling from the thermoelectric chip into the aluminum internal rib assembly and the hydrocarbon thermal control material coating;
• a front access opening positioned at an angle of approximately forty-five degrees relative to a vertical face of the aluminum payload chamber;
• a fluid circulation pathway thermally coupled to the hot side of the thermoelectric chip and configured to remove heat from the thermoelectric chip;
• and
• a forced-air heat-rejection assembly thermally coupled to the fluid circulation pathway and configured to reject heat to an ambient environment;
• wherein the aluminum internal rib assembly, the hydrocarbon thermal control material coating, the thermoelectric cooling assembly, the fluid circulation pathway, and the forced-air heat-rejection assembly cooperate to establish a multi-stage thermal pathway comprising:
• (1) conduction from the thermoelectric chip into the cooling block;
• (2) conduction from the cooling block into the upper aluminum chamber plate;
• (3) conduction from the upper aluminum chamber plate into the aluminum internal rib assembly;
• (4) thermal buffering and distribution by the hydrocarbon thermal control material coating through the 2-by-4 segmented conduction grid;
• (5) heat transfer from the hot side of the thermoelectric chip into the fluid circulation pathway;
• and
• (6) forced-air heat rejection from the fluid circulation pathway to the ambient environment.