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Hi,

For an ideal Rankine cycle,

the temperature-specific entropy diagram can be given as follows,

The pump in this cycle is isentropically 100% efficient.

My question is that why the temperature of the water increases as it flows through the pump (point 1 to 2) if the pump is 100% efficient. I can understand why point 2 is not on the saturation line (need higher temperature at a higher pressure to make a liquid saturated).

Thank you in advance.

For an ideal Rankine cycle,

the temperature-specific entropy diagram can be given as follows,

The pump in this cycle is isentropically 100% efficient.

My question is that why the temperature of the water increases as it flows through the pump (point 1 to 2) if the pump is 100% efficient. I can understand why point 2 is not on the saturation line (need higher temperature at a higher pressure to make a liquid saturated).

Thank you in advance.

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