The cycle on which an air refrigerator works is known as ________.
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A.
Carnot Cycle
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B.
Ericson cycle
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C.
Stirling cycle
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D.
Bell Coleman cycle
Correct Answer:
D. Bell Coleman cycle
Explanation:
The Bell Coleman cycle, also known as the Reversed Joule or Brayton cycle, is the standard thermodynamic cycle used in air refrigeration systems. Unlike vapor compression systems that use refrigerants like R-134a, this cycle uses air as the working fluid. It consists of four distinct processes: isentropic compression, constant-pressure cooling, isentropic expansion, and constant-pressure heat absorption (refrigeration). Because air remains in a gaseous state throughout the entire process, this cycle is particularly common in aircraft cooling applications where weight and safety are primary concerns.
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