Final answer:
Compression refrigeration systems absorb heat mainly by the evaporation of a liquid. This process is facilitated by the compressor raising the temperature and pressure of the refrigerant, which then evaporates in the evaporator coils, absorbing heat and cooling the space.
Step-by-step explanation:
Compression refrigeration systems utilize the concept of heat absorption primarily by A) the evaporation of a liquid. In these systems, an electrically driven compressor increases both the temperature and pressure of the refrigerant. This high-pressure gas then moves to the condenser coils, where it releases heat to the surrounding environment and condenses into a liquid. Subsequently, the liquid refrigerant goes through a pressure-reducing valve before reaching the evaporator coils. In the evaporator, the liquid absorbs heat as it evaporates back into a gas, effectively cooling the space.
The key components involved in this heat absorption process are the compressor, which increases the pressure and temperature of the refrigerant, and the evaporator, which facilitates the refrigerant evaporation, thereby absorbing heat from the surroundings.
The cycle is continuous: the refrigerant travels through the system, shifting phases between liquid and gas, and in the process, it transfers heat from one place to another, contributing to the cooling effect desired by the refrigeration system.