Outer panel-mediated cooling system

An outer panel-mediated cooling system of a transportation machine, comprising:

• an outer shell including an outer panel and an inner panel located inward of the outer panel;
• a heat source chamber that is located inward of the inner panel and in which a gas receives heat from a heat source;
• a cooling path that is located between the outer and inner panels, into which at least one of a pressurized gas and a return gas from the heat source chamber flows, in which the at least one gas releases heat outside through the outer panel to change into a cooled gas, and out of which the cooled gas flows;
• a non-cooling path that is located between the outer and inner panels and thermally insulated from the cooling path and the outer panel and through which at least one of the pressurized gas and the return gas from the heat source chamber passes;
• a mixing chamber into which the cooled gas leaving the cooling path and an uncooled gas leaving the non-cooling path flow, in which the cooled gas and the uncooled gas are mixed to form a mixed gas, and out of which the mixed gas flows toward the heat source chamber;
• and
• a flow rate regulating valve that regulates a flow rate of gas flowing toward the mixing chamber, wherein
• the flow rate regulating valve includes at least one of a first flow rate regulating valve that regulates a flow rate of the cooled gas flowing from the cooling path toward the mixing chamber and a second flow rate regulating valve that regulates a flow rate of the uncooled gas flowing from the non-cooling path toward the mixing chamber.