a) Explanation Express the energy balance by taking nozzle as the system which is a control volume to obtain net actual kinetic energy. E ˙ in − E ˙ out = Δ E ˙ system E ˙ in − E ˙ out = 0 E ˙ in = E ˙ out m ˙ [ h 1 + V 1 2 2 ] = m ˙ [ h 2 + V 2 2 2 ] [ h 1 + V 1 2 2 ] = [ h 2 + V 2 2 2 ] (I) Here, the rate of total energy entering the system is E ˙ in , the rate of total energy leaving the system is E ˙ out , the rate of change in the total energy of the system is Δ E ˙ system , rate of mass flow is m ˙ , initial and final specific enthalpy is h 1 and h 2 respectively, and initial and final velocity is V 1 and V 2 respectively. Write the expression for the exit velocity using equation (I). V 2 = 2 ( h 1 − h 2 ) + V 1 2 (II) Conclusion: From Table A-6, “Superheated water”, select the initial enthalpy ( h 1 ) and initial entropy ( s 1 ) at the pressure of 7 MPa and temperature of 500 ° C as 3411 b) To determine The isentropic efficiency of the nozzle c) To determine The exergy destruction within the nozzle

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ISBN: 8220102809444

Author: CENGEL

Publisher: YUZU

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Chapter 8.8, Problem 72P

To determine

The exit velocity of the steam

To determine

The isentropic efficiency of the nozzle

To determine

The exergy destruction within the nozzle

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Chapter 8.8, Problem 71P

Chapter 8.8, Problem 73P

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