The ideal gas-refrigeration cycle is the same as the

Concept:

Ideal gas-refrigeration cycle works on reversed Brayton (or) Joule cycle.

Concept:

Air refrigeration systems:

• Air refrigeration systems belong to the class of gas cycle refrigeration systems, in which a gas is used as the working fluid
• The gas does not undergo any phase change during the cycle, consequently, all the internal heat transfer processes are sensible heat transfer processes.
• The air refrigeration system works on the reverse Joule cycle or reverse Brayton cycle or Bell-Coleman Cycle.
• First air is compressed and then heat removed, this air is then expanded to a lower temperature than before it was compressed.
• Work must be taken out of the air during the expansion, otherwise, the entropy would increase.

Important Points

• Gas Turbine works on Joule Cycle.
• Steam Engines works on Rankine Cycle.
• Spark ignition (SI) engines or petrol engines work on Otto Cycle.
• Carnot cycle is the most efficient heat engine cycle.
• Refrigerator and AC work on vapour compression cycle.