HW09_Sol

# HW09_Sol - saturated vapor The heat is rejected from the water at 40°C Show the cycle on a T–s diagram and find the quality of the water at the

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ME 3513 – Thermodynamics I Solutions to Homework Assignment # 9 – Chap. 8 – Entropy, Reversible Processes 1. Consider the steam power plant in Example 6.9 and assume an average T in the line between 1 and 2. Show that this cycle satisfies the inequality of Clausius. 2. Find the missing properties and give the phase of the substance. Plot each state in a P-v and T-s diagram. Indicate the thermodynamic table used in each case, and verify the results with the computer program CATT. a. H2O s = 7.70 kJ/kg K, P = 25 kPa h = ? T = ? x = ? b. H2O u = 3400 kJ/kg, P = 10 MPa T = ? x = ? s = ? c. R-12 T = 0°C, P = 200 kPa s = ? x = ? d. R-134a T = −10°C, x = 0.45 v = ? s = ? e. NH3 T = 20°C, s = 5.50 kJ/kg K u = ? x = ?

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3. Consider a Carnot-cycle heat engine with water as the working fluid. The heat transfer to the water occurs at 300°C, during which process the water changes from saturated liquid to
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Unformatted text preview: saturated vapor. The heat is rejected from the water at 40°C. Show the cycle on a T–s diagram and find the quality of the water at the beginning and end of the heat rejection process. Determine the net work output per kilogram of water and the cycle thermal efficiency. 4. Water at 200 kPa, x = 1.0 is compressed in a piston/cylinder to 1 MPa, 350oC in a reversible process. Find the sign for the work and the sign for the heat transfer. Plot the initial and final state in a P-v and a T-s diagram. 5. Water at 1000 kPa, 250°C is brought to saturated vapor in a piston/cylinder with an isobaric process. Find the specific work and heat transfer. Estimate the specific heat transfer from the area in the T-s diagram and compare it to the correct value....
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## This homework help was uploaded on 04/18/2008 for the course ME 3513 taught by Professor Felicelli during the Fall '04 term at Mississippi State.

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HW09_Sol - saturated vapor The heat is rejected from the water at 40°C Show the cycle on a T–s diagram and find the quality of the water at the

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