Microsoft Word - Cengel and Boles TOC _2-03-05_.doc

Chapter 7 | 415 entropy generation during this process. Answers:(a) 442 kPa, 69.5°C, (b) 0.258 kJ/kg K 7–166 Refrigerant-134a e ...

7–174 Consider a three-stage isentropic compressor with two intercoolers that cool the gas to the initial temperature between th ...

Chapter 7 | 417 7–182 The explosion of a hot water tank in a school in Spencer, Oklahoma, in 1982 killed 7 people while injuring ...

7–188 A 1200-W electric resistance heating element whose diameter is 0.5 cm is immersed in 40 kg of water initially at 20°C. Ass ...

Chapter 7 | 419 the entire system cools to the surrounding air temperature of 70°F. Determine the total entropy generated during ...

water pipe heats the water from 16 to 43°C. Taking the den- sity of water to be 1 kg/L, determine the electric power input to th ...

Chapter 7 | 421 350 kW power is produced by the turbine, determine the effi- ciency of the turbine. Take the density of LNG to b ...

isentropic efficiency of 80 percent, the power produced by the turbine is (a) 194 kW (b) 291 kW (c) 484 kW (d) 363 kW (e) 605 kW ...

Chapter 8 EXERGY: A MEASURE OF WORK POTENTIAL | 423 T he increased awareness that the world’s energy resources are limited has c ...

8–1 ■ EXERGY: WORK POTENTIAL OF ENERGY When a new energy source, such as a geothermal well, is discovered, the first thing the e ...

The notion that a system must go to the dead state at the end of the process to maximize the work output can be explained as fol ...

Potential energy is also a form of mechanical energy, and thus it can be converted to work entirely. Therefore, the exergyof the ...

8–2 ■ REVERSIBLE WORK AND IRREVERSIBILITY The property exergy serves as a valuable tool in determining the quality of energy and ...

of the model (isentropic) process is not the same as the actual exit state and it is limited to adiabatic processes. In this sec ...

Irreversibility can be viewed as the wasted work potentialor the lost opportunityto do work. It represents the energy that could ...

430 | Thermodynamics Analysis We take the iron blockas the system. This is a closed system since no mass crosses the system boun ...

Chapter 8 | 431 The irreversibility for this process is determined from its definition, Discussion Notice that the reversible wo ...

8–3 ■ SECOND-LAW EFFICIENCY, hII In Chap. 6 we defined the thermal efficiencyand the coefficient of perfor- mancefor devices as ...

That is, engine Ais converting 60 percent of the available work potential to useful work. This ratio is only 43 percent for engi ...

For a heat engine,the exergy supplied is the decrease in the exergy of the heat transferred to the engine, which is the differen ...