8 / 20
A vapor cycle system is composed of...
  • A
    Primary heat exchanger, ice screen, evaporator, pump.
  • B
    Compressor, condenser, expansion valve, evaporator, and a water separator.
  • C
    Compressor, bootstrap, condenser, secondary heat exchanger.
  • D
    Condenser, bootstrap, primary heat exchanger, pack fan.

Refer to figure.
The vapour cycle cooling system comprises several key components, including a compressor, condenser, evaporator, and expansion valve. Here's how the vapor cycle cooling system works:

  • Compression: The cycle begins at the compressor. The compressor's job is to compress a low-pressure, low-temperature vaporized refrigerant gas (freon) into a high-pressure, high-temperature gas. This compression process raises the temperature and pressure of the refrigerant.

  • Condensation: The high-pressure, high-temperature gas then enters the condenser. In the condenser, the hot refrigerant gas (freon) releases heat to the surrounding environment, causing it to condense into a high-pressure liquid. This process is exothermic and releases a significant amount of heat energy.

  • Expansion: The high-pressure liquid refrigerant then passes through an expansion valve. This valve rapidly reduces the pressure of the refrigerant (freon), causing it to expand and become a low-pressure, low-temperature mixture of liquid and vapor. This expansion process is adiabatic and results in a drop in temperature.

  • Evaporation: The low-pressure, low-temperature refrigerant (freon) enters the evaporator. In the evaporator, the refrigerant (freon) absorbs heat from its surroundings. This endothermic process absorbs heat energy from the surroundings, causing a cooling effect.

  • Water separation: The water separator in a cooling system is a component designed to separate water from a mixture of air and water vapor. It effectively removes moisture from the air, preventing it from entering the cooling system.

  • Return to the Compressor: The low-pressure vapor is then returned to the compressor, and the cycle repeats.

This continuous cycle of compression, condensation, expansion, and evaporation allows the vapor cycle cooling system to transfer heat from the cooled space to the external environment, thereby cooling the space. By controlling the temperature and pressure of the refrigerant (freon), the system can maintain a desired temperature within the cooled space.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.