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Steam at 1.4 MPa and 350 °C enters an adiabatic turbine at a rate of 450 kg/hr. The exhaust pressure is 100 kPa. To start, assume the turbine is reversible. Neglect changes in kinetic and potential energy and assume steady flow. (a) Sketch this process on a T- s diagram.

Steam at 1.4 MPa and 350 °C enters an adiabatic turbine at a rate of 450 kg/hr. The exhaust pressure is 100 kPa. To start, assume the turbine is reversible. Neglect changes in kinetic and potential energy and assume steady flow. (a) Sketch this process on a T- s diagram.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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4 Irreversible turbine Steam at 1.4 MPa and 350 °C enters an adiabatic turbine at a rate of 450 kg/hr. The exhaust pressure is 100 kPa. To start, assume the turbine is reversible. Neglect changes in kinetic and potential energy and assume steady flow. Sketch this process on a T - s diagram. (a) (b) turbine. Now, consider that the turbine is irreversible. We can define the adiabatic-turbine efficiency nT as: Find the temperature of the exhaust stream and the power produced by the (c) (d) (e) (1) where h, is the inlet enthalpy, he,a is the actual exit enthalpy, and he,s is the isentropic exit enthalpy. This quantity can be viewed as the ratio of the irreversible power to the reversible power. Let's take n 0.8. = hi - he,a hi - he,s NT = Draw the irreversible process on a T s diagram with a dashed line. Find the power produced by the actual turbine and the actual exit enthalpy. Calculate the rate of entropy generation.
Transcribed Image Text:4 Irreversible turbine Steam at 1.4 MPa and 350 °C enters an adiabatic turbine at a rate of 450 kg/hr. The exhaust pressure is 100 kPa. To start, assume the turbine is reversible. Neglect changes in kinetic and potential energy and assume steady flow. Sketch this process on a T - s diagram. (a) (b) turbine. Now, consider that the turbine is irreversible. We can define the adiabatic-turbine efficiency nT as: Find the temperature of the exhaust stream and the power produced by the (c) (d) (e) (1) where h, is the inlet enthalpy, he,a is the actual exit enthalpy, and he,s is the isentropic exit enthalpy. This quantity can be viewed as the ratio of the irreversible power to the reversible power. Let's take n 0.8. = hi - he,a hi - he,s NT = Draw the irreversible process on a T s diagram with a dashed line. Find the power produced by the actual turbine and the actual exit enthalpy. Calculate the rate of entropy generation.
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