A refrigeration unit is a system designed to remove heat from a designated area, thereby lowering the temperature. It typically consists of components such as a compressor, condenser, evaporator, and expansion valve. These parts work together to circulate a refrigerant, which absorbs heat from the environment and releases it outside, keeping the interior cool. Refrigeration units are commonly used in various applications, including residential refrigerators, commercial freezers, and industrial cooling systems. They play a crucial role in preserving food, pharmaceuticals, and other perishable items by maintaining a stable, low temperature.