Explanation Write relation of thermal efficiency of the combined gas-steam power plant. η cc = η g + η s − η g η s (I) Here, the efficiency of the combined gas-steam power plant is η cc , the efficiency of the gas power cycle is η g , and the efficiency of the steam power cycle is η s . Conclusion: Factoring out the term η g from Equation (I) as follows. η cc = η s + η g ( 1 − η s ) (II) In Equation (II), the term η g ( 1 − η s ) is positive and the term η s is lesser than 1 ( η s < 1 ) . The result of Equation (II) is greater than the value of η s . Thus, the thermal efficiency of the combined gas-steam power plant is greater than the efficiency of steam power cycle. Factoring out the term η s from Equation (I) as follows. η cc = η g + η s ( 1 − η g ) (III) In Equation (III), the term η s ( 1 − η g ) is positive and the term η g is lesser than 1 ( η g < 1 ) . The result of Equation (III) is greater than the value of η g

8th Edition

ISBN: 9780073398174

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

See similar textbooks

Concept explainers

IC engines

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…

Question

Chapter 10.9, Problem 113RP

To determine

Prove that the efficiency of the combined gas-steam power plant is greater than either the efficiency of gas power cycle or steam power cycle.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 10.9, Problem 112RP

Chapter 10.9, Problem 114RP

Students have asked these similar questions

A gas within a piston-cylinder assembly executes a Carnot power cycle during which the isothermal expansion occurs at TH= 500 K and the isothermal compression occurs at Tc = 290 K. Determine: (a) the thermal efficiency. (b) the percent change in thermal efficiency if TH increases by 10% while Tc remains the same. (c) the percent change in thermal efficiency if Tc decreases by 10% while TH remains the same. (d) the percent change in thermal efficiency if TH increases by 10% and Tc decreases by 10%.

(A) the net heat energy absorbed during a cyclic process (the difference between heat flowing into the system and heat leaving the system) is the work. If we regard the atmosphere as a heat engine, what is the work being done by the atmosphere? That is, what phenomenon or phenomena are a realization of the work being done by the atmosphere? (B) Of all possible heat engines, the Carnot cycle has the maximum efficiency between any two operating temperatures (think of these temperatures as the maximum and minimum temperatures encountered during the cycle). Estimate the Carnot efficiency of Earth's atmosphere. [Hint: Think about the temperature variation with latitude.] (C) Do you think the efficiency of the real atmosphere would be "close" or "far" from the Carnot efficiency? Please explain your answer.

Two reversible cycles operate between hot and cold reservoirs at temperatures TH and TC, respectively. (a)If one is a power cycle and the other is a refrigeration cycle, what is the relation between the coefficient of performance of the refrigeration cycle and the thermal efficiency of the power cycle? (b)If one is a refrigeration cycle and the other is a heat pump cycle, what is the relation between their coefficients of performance?

Chapter 10 Solutions

Thermodynamics: An Engineering Approach

Ch. 10.9 - Why is the Carnot cycle not a realistic model for...Ch. 10.9 - Prob. 2P Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - Consider a steady-flow Carnot cycle with water as...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - How do actual vapor power cycles differ from...Ch. 10.9 - The entropy of steam increases in actual steam...

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Prove that the efficiency of the combined gas-steam power plant is greater than either the efficiency of gas power cycle or steam power cycle.

Solution Summary: The author demonstrates that the efficiency of the combined gas-steam power plant is greater than either the efficient of gas power cycle or steam.

Concept explainers

Prove that the efficiency of the combined gas-steam power plant is greater than either the efficiency of gas power cycle or steam power cycle.

Want to see the full answer?

Chapter 10 Solutions