1) A piston with water vapor at a pressure of 300 kPa and a temperature of 175 oC in the cylinder Assembly, 20 kg of fluid is compressed to a pressure of 950 kPa. In order to keep the temperature of the water inside the piston cylinder Assembly constant, the heat generated during compression is thrown into a heat well at a temperature of 80 C. a) In the first case, what phase is the water in? b) In the last case, what phase is the water in? c) Find a change in entropy in water with a change in state.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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1) A piston with water vapor at a pressure of 300 kPa and a temperature of 175 oC in the
cylinder Assembly, 20 kg of fluid is compressed to a pressure of 950 kPa. In order to keep the
temperature of the water inside the piston cylinder Assembly constant, the heat generated
during compression is thrown into a heat well at a temperature of 80 C.
a) In the first case, what phase is the water in?
b) In the last case, what phase is the water in?
c) Find a change in entropy in water with a change in state.
d) Calculate the amount of heat drawn from the cylinder, assuming that the state change is
a reversible process at constant temperature.
e) Find the entropy change of the heat well.
f) Specify whether the process is reversible or irreversible when the total entropy change
covering the Piston cylinder mechanism and the heat well is taken into account.
g) Determining the state change in saturation curves and values is also shown in the
diagrams T (°C)-s (kJ/ups) and P (Pa) - m3 (m3/kg).
Transcribed Image Text:1) A piston with water vapor at a pressure of 300 kPa and a temperature of 175 oC in the cylinder Assembly, 20 kg of fluid is compressed to a pressure of 950 kPa. In order to keep the temperature of the water inside the piston cylinder Assembly constant, the heat generated during compression is thrown into a heat well at a temperature of 80 C. a) In the first case, what phase is the water in? b) In the last case, what phase is the water in? c) Find a change in entropy in water with a change in state. d) Calculate the amount of heat drawn from the cylinder, assuming that the state change is a reversible process at constant temperature. e) Find the entropy change of the heat well. f) Specify whether the process is reversible or irreversible when the total entropy change covering the Piston cylinder mechanism and the heat well is taken into account. g) Determining the state change in saturation curves and values is also shown in the diagrams T (°C)-s (kJ/ups) and P (Pa) - m3 (m3/kg).
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