How does a heat mover transfer thermal energy in a direction opposite to that of its natural movement?
It doesn't. Energy is added to reverses the gradient. Temperature is heat density. Heat flows form high density to low density. Compressing a gas increases the heat density. Rarifying a gas decreases the heat density. So, compress a gas and run it through a heat exchanger (a coil of tubing). Heat flows from the hot gas to the surrounding, cool fluid. As the cooled gas comes out of the far end of the coil allow it to depressurize and run it through a second heat exchanger. Heat flows form the surrounding, warm fluid into the cold gas.
Have you heard of a heat exchanger? One side goes through tubes and one surronds the tubes with gas or liquid at different temperatures. There is a crossflow which one side releases while the other absorbs heat. They flow in opposite directions. Google shell and tube heat exchangers. You will see some good pictures. Thermal Engineer
