In a vapor-cycle cooling system, where does freon absorb heat and change from liquid to gas?

In a vapor-cycle cooling system, the correct location where freon absorbs heat and transitions from a liquid to a gas is the evaporator. In this component, the low-pressure liquid refrigerant (freon) passes through coils or tubes where it is exposed to the air or another fluid to be cooled. As the refrigerant absorbs heat from its surroundings, it transforms into vapor. This process is essential for the cooling effect because it removes heat from the cabin or space being conditioned, thereby lowering the temperature.

The evaporator works by utilizing the principles of thermodynamics, specifically the latent heat of vaporization, where the refrigerant requires energy to change its state from liquid to gas. This phase change is crucial for the overall efficiency and effectiveness of the cooling system.

In contrast, the condenser is where the refrigerant releases heat and changes from gas back to a liquid, while the expansion turbine reduces the pressure of the refrigerant but does not facilitate the heat absorption process. The compressor plays a different role by increasing the pressure of the refrigerant vapor, allowing it to flow back to the condenser. Thus, the evaporator is the key component where the absorption of heat occurs, allowing the system to function properly.