Chapter 8, Problem 8.56P

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One mol of an ideal gas is taken through The gas is subjected a three-step cyclic process. successively to an isothermal expansion at 600 K from 5 to 3 bar (path a to b), a constant-pressure cooling (b to c), and a constant-volume heating (c to a). All processes are reversible. Cy and Cp AH for each step and for the entire process. Draw the cycle on the PV diagram. Compile all results in a table, as follows: 21.686 J mol-K-1 =30 J mol-1K-1. Calculate Q, W, AU and %3D

1 mol of ideal gas was isothermally compressed but irreversible @130degreecelcius from from 2.5 to 6.5 bar in a piston. The needed work is 30%>reversible work of this process (isothermal). The transferred heat from gas flows to heat sink @25degcelcius during the compression. Find entrophy changes, total entropy and the heat sink.

SU-2 A gas at 500K is in a cylinder with a frictionless piston. The gas goes thru a reversible cycle during which it absorbs 400J from a reservoir at 500K. During part of the cycle the gas rejects heat Q to a reseroir at 300K. Let the system be defined as the gas. a) What is the change in entropy for the system for one cycle of operation of the engine? Briefly explain your answer. b) Find the change in entropy for the universe for one cycle of operation of the engine. Briefly explain your answer. c) Find the change in entropy for the surroundings for one cycle of operation of the engine. Briefly explain your answer. d) Use your results from the previous parts to find how many joules of heat were rejected to the 300K reservoir during this process.

1. In a steam power plant steam enters the turbine at 6 bar and 400°C and is expanded isentropic ally to the condenser pressure of 0.1 bar. If the isentropic efficiency of the turbine is 80%, find the actual net work output and the thermal efficiency.

78 kg of water vapor is found as saturated vapor at 650 kPa pressure in a cube-shaped container with a fixed volume. The cube lost heat and its pressure dropped to 325 kPa. Since the environmental conditions are 100 kPa 25 ºC, find the exergy change of the steam in the first and the last state, the exergy change in the steam, the exergy destruction and the second-law efficiency for this process change.

SHOW COMPLETE AND LEGIBLE SOLUTION. FAST ANSWERS WILL BE GIVEN UPVOTE. ANSWER B ONLY.

2000 kg cast iron hoisin at 350 degree Celsius is quenched in 4000 kg of water at 15 degree Celsius. Find the amount of heat transferred to the water bath, entropy change for water and cast iron, use the entropy generation to prove that the entire system does not violate the second law of thermodynamics. Water specific heat of 4.18kj/kg.k, cast iron specific heat of 0.42kj/kg.k

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