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A piston-cylinder device initially contains steam at 3.5 MPa, and 250°C. Steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated water vapor. The cooling continues until the water is at 150°C. Determine the total work and heat transfer per unit mass of water (kJ/kg). Draw the processes on T-v diagram.

A piston-cylinder device initially contains steam at 3.5 MPa, and 250°C. Steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated water vapor. The cooling continues until the water is at 150°C. Determine the total work and heat transfer per unit mass of water (kJ/kg). Draw the processes on T-v 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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Sat. u h m³/kg kJ/kg kJ/kg kJ/kg-K P= 3.50 MPa (242.56°C) 0.05706 2603.0 2802.7 6.1244 225 250 0.05876 2624.0 2829.7 300 0.06845 2738.8 2978.4 0.07680 2836.0 3104.9 6.6601 0.08456 2927.2 3223.2 350 400 6.8428 450 0.09198 3016.1 3338.1 7.0074 0.09919 3104.5 3451.7 7.1593 500 Saturated water-Temperature table Specific volume, m³/kg Temp., T°C Sat. Press., PkPa U₂ Sat. Sat. liquid, vapor, U₂ 150 155. 160 165 170. 125 130 135 140 361.53 0.001080 145 415.68 0.001085 232.23 0.001065 270.28 0,001070 313.22 0.001075 6.1764 6.4484 476.16 0.001091 543.49 0.001096 618.23 0.001102 700.93 0.001108 792.18 0.001114 Internal energy, kJ/kg Steam 3.5 MPa 250 °C Enthalpy, kJ/kg Sat. Sat. liquid, Evap., vapor, "48 "₂ 0.44600 0.77012 524.83 2009.5 2534.3 525.07 2188.1 2713.1 0.66808 546.10 1993.4 2539.5 546.38 2173.7 2720.1 0.58179 567.41 1977.3 2544.7 567.75 2159.1 2726.9 0.50850 588.77 1960.9 2549.6 589.16 2144.3 2733.5 610.19 1944.2 2554.4 610.64 2129.2 2739.8 1927.4 2559.1 632.18 2113.8 2745.9 1910.3 2563.5 653.79 2098.0 2751.8 1893.0 2567.8 675.47 2082.0 2757.5 696.46 1875.4 2571.9 697.24 2065.6 2762.8 1857.5 2575.7 719.08 2048.8 2767.9 0.39248 631.66 0.34648 653.19 0.30680 674.79 0.27244 0.24260 718.20 Sat. liquid, Evap., hy ng Sat. vapor, h₂
Transcribed Image Text:Sat. u h m³/kg kJ/kg kJ/kg kJ/kg-K P= 3.50 MPa (242.56°C) 0.05706 2603.0 2802.7 6.1244 225 250 0.05876 2624.0 2829.7 300 0.06845 2738.8 2978.4 0.07680 2836.0 3104.9 6.6601 0.08456 2927.2 3223.2 350 400 6.8428 450 0.09198 3016.1 3338.1 7.0074 0.09919 3104.5 3451.7 7.1593 500 Saturated water-Temperature table Specific volume, m³/kg Temp., T°C Sat. Press., PkPa U₂ Sat. Sat. liquid, vapor, U₂ 150 155. 160 165 170. 125 130 135 140 361.53 0.001080 145 415.68 0.001085 232.23 0.001065 270.28 0,001070 313.22 0.001075 6.1764 6.4484 476.16 0.001091 543.49 0.001096 618.23 0.001102 700.93 0.001108 792.18 0.001114 Internal energy, kJ/kg Steam 3.5 MPa 250 °C Enthalpy, kJ/kg Sat. Sat. liquid, Evap., vapor, "48 "₂ 0.44600 0.77012 524.83 2009.5 2534.3 525.07 2188.1 2713.1 0.66808 546.10 1993.4 2539.5 546.38 2173.7 2720.1 0.58179 567.41 1977.3 2544.7 567.75 2159.1 2726.9 0.50850 588.77 1960.9 2549.6 589.16 2144.3 2733.5 610.19 1944.2 2554.4 610.64 2129.2 2739.8 1927.4 2559.1 632.18 2113.8 2745.9 1910.3 2563.5 653.79 2098.0 2751.8 1893.0 2567.8 675.47 2082.0 2757.5 696.46 1875.4 2571.9 697.24 2065.6 2762.8 1857.5 2575.7 719.08 2048.8 2767.9 0.39248 631.66 0.34648 653.19 0.30680 674.79 0.27244 0.24260 718.20 Sat. liquid, Evap., hy ng Sat. vapor, h₂
A piston-cylinder device initially contains steam at 3.5 MPa, and 250°C. Steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated water vapor. The cooling continues until the water is at 150°C. Determine the total work and heat transfer per unit mass of water (kJ/kg). Draw the processes on T-v diagram.
Transcribed Image Text:A piston-cylinder device initially contains steam at 3.5 MPa, and 250°C. Steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated water vapor. The cooling continues until the water is at 150°C. Determine the total work and heat transfer per unit mass of water (kJ/kg). Draw the processes on T-v diagram.
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