Microsoft Word - Cengel and Boles TOC _2-03-05_.doc
Chapter 8 | 455 (c) The wasted work potential is equivalent to the exergy destroyed, which can be determined from XdestroyedT 0 ...
456 | Thermodynamics The useful work is the difference between these two: That is, 1.43 kJ of the work done is available for cre ...
8–8 ■ EXERGY BALANCE: CONTROL VOLUMES The exergy balance relations for control volumes differ from those for closed systems in t ...
proportional to the amount of mass (Fig. 8–42). Again taking the positive direction of heat transfer to be to the system and the ...
Dividing Eq. 8–48 by m . gives the exergy balance on a unit-mass basisas Per-unit mass: (8–49) where qQ . /m . and wW . /m . a ...
cold stream, provided that the cold stream is not at a lower temperature than the surroundings. Then the second-law efficiency o ...
Chapter 8 | 461 Assumptions 1 This is a steady-flow process since there is no change with time at any point and thus mCV0, ECV ...
462 | Thermodynamics (c) The second-law efficiency of a turbine is the ratio of the actual work delivered to the reversible work ...
Chapter 8 | 463 The maximum power output (reversible power) is determined from the rate form of the exergy balance applied on th ...
464 | Thermodynamics Assumptions 1 Air is an ideal gas. 2 The kinetic and potential energies are negligible. 3 The properties of ...
Chapter 8 | 465 and Discussion Note that a minimum of 281 MJ of work input is required to fill the tank with compressed air at 3 ...
466 | Thermodynamics “Now I’m in bed by 9:30 and I’m up by 6,” he says. “I get twice as much done as I used to. I don’t have to ...
Chapter 8 | 467 Childrenare born with different levels of exergies(talents) in different areas. Giving aptitude tests to childre ...
468 | Thermodynamics In thermodynamics,the first-law efficiency(or thermal efficiency) of a heat engine is defined as the ratio ...
Chapter 8 | 469 The arguments presented here are exploratory in nature, and they are hoped to initiate some interesting discussi ...
Exergy transfer by work: Exergy transfer by mass: The exergy of an isolated system during a process always decreases or, in the ...
Chapter 8 | 471 8–6C Consider a process that involves no irreversibilities. Will the actual useful work for that process be equa ...
8–21 How much of the 100 kJ of thermal energy at 800 K can be converted to useful work? Assume the environment to be at 25°C. 8– ...
Chapter 8 | 473 Now the partition is removed, and the water expands to fill the entire tank. If the final pressure in the tank i ...
activated to stir the water. It is observed that thermal equilib- rium is established after 20 min with a final temperature of 2 ...
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