Explanation Given: The volume of the steam cooker ( ν ) is 20 L . The maximum pressure in the cooker ( P max ) is 150 kPa . The initial pressure of water ( P w ) is 175 kPa. The quality of the steam ( x 1 ) is 10 % . The final quality of the steam ( x 2 ) is 40 % . Calculation: Refer Table A-5, “the saturated water-pressure table”, obtain the following properties for the pressure of 175 kPa. v f = 0.001057 m 3 / kg v g = 1.0037 m 3 / kg s f = 1.4850 kJ / kg ⋅ K s f g = 5.6865 kJ / kg ⋅ K Calculate the initial specific volume. v 1 = v f + x 1 ( v g − v f ) v 1 = 0.001057 m 3 / kg + 0.10 ( 1.0037 m 3 / kg − 0.001057 m 3 / kg ) = 0.1013 m 3 / kg Calculate the initial entropy of the system. s 1 = s f + x 1 s f g s 1 = 1.4850 kJ / kg ⋅ K + 0.10 ( 5.6865 kJ / kg ⋅ K ) = 2.0537 kJ / kg ⋅ K Refer Table A-5, “the saturated water-pressure table”, Obtain the following properties for the final pressure of 150 kPa. v f = 0.001053 m 3 / kg v g = 1.1594 m 3 / kg s f = 1.4337 kJ / kg ⋅ K s g = 5.7894 kJ / kg ⋅ K Calculate the final specific volume. v 2 = v f + x 2 ( v g − v f ) v 2 = 0.001053 m 3 / kg + 0.40 ( 1.1594 m 3 / kg − 0.001053 m 3 / kg ) = 0.4644 m 3 / kg Calculate the final entropy of the system. s 2 = s f + x 2 s f g s 2 = 1.4337 kJ / kg ⋅ K + 0.40 ( 5.7894 kJ / kg ⋅ K ) = 3.7494 kJ / kg ⋅ K Calculate the initial mass. m 1 = ν v 1 m 1 = 20 L × 1 m 3 1000 L 0.1013 m 3 / kg m 1 = 0.020 m 3 0.1013 m 3 / kg = 0.1974 kg Calculate the final mass. m 2 = ν v 2 m 2 = 20 L × 1 m 3 1000 L 0.4644 m 3 / kg m 2 = 0.020 m 3 0.4644 m 3 / kg = 0

5th Edition

ISBN: 9780078027680

Author: Yunus A. Cengel Dr., Robert H. Turner, John M. Cimbala

Publisher: McGraw-Hill Education

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. T…

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Chapter 8, Problem 55P

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The minimum entropy change of the thermal energy reservoir.

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Chapter 8, Problem 54P

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