The ideal vapour-compression refrigeration cycle is not a reversible cycle becauseQuestion 1Select one or more:a.heat input is not isothermal across an infinitesimal temperature differenceb.the ideal compression process is non-isentropicc.heat rejection is not isothermal across an infinitesimal temperature differenced.expansion process through the throttling valve is irreversiblee.phase changes that occurring during heat input and output cannot be reversed

The ideal vapour-compression refrigeration cycle is not a reversible cycle due to several reasons:

a. Heat input is not isothermal across an infinitesimal temperature difference: In a reversible cycle, the heat exchange process should be isothermal, meaning it should occur at a constant temperature. However, in the vapour-compression cycle, the heat input process is not isothermal.

b. The ideal compression process is non-isentropic: In a reversible cycle, the compression process should be isentropic, meaning there should be no change in entropy. However, in the vapour-compression cycle, the compression process is not isentropic.

c. Heat rejection is not isothermal across an infinitesimal temperature difference: Similar to the heat input, the heat rejection process in a vapour-compression cycle is not isothermal, which makes the cycle irreversible.

d. Expansion process through the throttling valve is irreversible: The throttling process, which is an essential part of the vapour-compression cycle, is an irreversible process. This is because it involves a rapid expansion of the refrigerant which does not allow the system to maintain equilibrium.

e. Phase changes that occur during heat input and output cannot be reversed: The phase changes that occur during the heat input and output processes in the vapour-compression cycle are irreversible. This is because these phase changes involve a change in the physical state of the refrigerant, which cannot be easily reversed.