E115_Problem_Set_6 - e 115 Engineering Thermodynamics...

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e 115 Engineering Thermodynamics Fall 2009 University of California Problem set 6 Due: Wednesday, September 16 th , in lecture 1) (35 points) One mole of an ideal monatomic gas is taken through the cycle shown below. 0 1 2 3 4 5 6 7 8 9 10 11 0 10 20 30 40 50 P (atm) V (L) I II III IV The gas is initially at a pressure of 10 atm and a temperature of 1000°C. The complete cycle returns the gas to state I. The cycle consists of four steps: 1. Step 1 is an isothermal tripling of the volume. 2. Step 2 takes the gas to a pressure of 1 atm along a polytropic path given by PV 3 = 1.026 × 10 5 atm 3 . 3. Step 3 compresses the gas isobarically. 4. Step 4 returns the gas to its initial state along a polytropic path given by PV 5 = 1.246 × 10 6 atm 5 .
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E115 Problem Set 6 A. M. Glaeser 1 2 1 a) Calculate q and w for each step of this cycle. (20 points) b) What is the efficiency of this process? Calculate the efficiency of a Carnot cycle operating between the minimum temperature ( T L
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This note was uploaded on 02/12/2011 for the course E 115 taught by Professor Staff during the Fall '08 term at University of California, Berkeley.

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E115_Problem_Set_6 - e 115 Engineering Thermodynamics...

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