a) Explanation Draw the given diesel cycle on P − v diagram as in Figure (1). Write the relationship between temperature and specific volume for the isentropic compression process 1-2from Figure (1). T 2 = T 1 ( v 1 v 2 ) k − 1 (I) Here, the temperature at state 1 is T 1 , the temperature at state 2 is T 2 , specific volume at state 1 is v 1 , specific volume at state 2 is v 2 , and the specific heat ratio is k . Write the relationship between the temperature, pressure, and specific volume for the constant pressure heat addition process 2-3. P 3 v 3 T 3 = P 2 v 2 T 2 For process 2-3, P 2 and P 3 are equal. T 3 = v 3 v 2 T 2 (II) Here, the temperature at state 3 is T 3 , specific volume at state 2 is v 2 , specific volume at state 3 is v 3 , pressure at state 3 is P 3 , pressure at state 2 is P 2 , and specific volume at state 3 is v 3 . From the Table A-2 “Ideal2gas specific heats of various common gases” obtain the below properties for air b) To determine The thermal efficiency of the given diesel cycle c) To determine The mean effective pressure for the given diesel cycle

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ISBN: 8220102809444

Author: CENGEL

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The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical ener…

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Chapter 9.12, Problem 47P

To determine

The temperature and pressure at the end of the heat addition process

To determine

The thermal efficiency of the given diesel cycle

To determine

The mean effective pressure for the given diesel cycle

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Chapter 9.12, Problem 46P

Chapter 9.12, Problem 48P

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The engine designed by Lenoir was essentially an atmospheric engine based on the early steam engines. In this, a combustible mixture was contained in a cylinder: it was ignited and the pressure increased isochorically to the maximum level. After this the gas expanded isentropically through an expansion ratio, re, during which it produced work output. The air-standard cycle returned the gas to state 1 through an isochoric expansion to p₁ and an isobaric compression to V1. Assume p₁ = 1 bar, T₁ = 15 °C, p2 = 10 bar and the expansion ratio, re = 5. Calculate the specific work output and thermal efficiency of this cycle. How does this compare with the efficiency of an equivalent Carnot cycle? [650.30 kJ/kg; 34.97%; 90.0%]

(1) A four-cylinder engine has a compression ratio of 8, and cach cylinder has a maximum volume of 0.6 L. At the beginning of the compression process, the air is at 98 kPa and 17°C, and the maximum temperature in the cycle is 1800 K., dctermine (a) the amount of heat supplied per cylinder. (b) the thermal efficiency, and (c) the number of revolutions per minute rcquired for a net power output of 60 kW. Study the effect of varying the compression ratio from 5 to 11 on the network done and the efficiency of the cycle. Plot the P-v and T-s diagrams for the cycle, and discuss the results.

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Chapter 9 Solutions

EBK THERMODYNAMICS: AN ENGINEERING APPR

Ch. 9.12 - What are the air-standard assumptions?Ch. 9.12 - What is the difference between air-standard...Ch. 9.12 - How does the thermal efficiency of an ideal cycle,...Ch. 9.12 - What does the area enclosed by the cycle represent...Ch. 9.12 - Prob. 5P Ch. 9.12 - Prob. 6P Ch. 9.12 - Can the mean effective pressure of an automobile...Ch. 9.12 - Prob. 8P Ch. 9.12 - What is the difference between spark-ignition and...Ch. 9.12 - Prob. 10P

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The temperature and pressure at the end of the heat addition process

Solution Summary: The author illustrates the relationship between temperature and specific volume for the isentropic compression process 1-2.

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The temperature and pressure at the end of the heat addition process

The thermal efficiency of the given diesel cycle

The mean effective pressure for the given diesel cycle

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