(a) Explanation Sketch the T − s diagram for the ideal gas refrigeration cycle as in Figure (1). Write the relation between temperature and pressure for an isentropic process. T 2 s = T 1 ( P 2 P 1 ) ( k − 1 ) / k (I) Here, the specific heat ratio of helium is k , initial temperature of an isentropic process is T 1 , temperature at the exit of an isentropic process is T 2 s , initial pressure is P 1 , and the pressure at the exit of an isentropic process is P 2 . Write the formula for the isentropic efficiency of the turbine ( η T ) . η T = h 3 − h 4 h 3 − h 4 s η T = T 3 − T 4 T 3 − T 4 s (II) Here, specific enthalpy at the turbine inlet is h 3 , specific enthalpy at the isentropic exit of turbine is h 4 s , specific enthalpy at the actual exit of turbine is h 4 , temperature at the inlet of turbine is T 3 , temperature at the isentropic exit of turbine is T 4 s , and the temperature at the actual exit of turbine is T 4 . Write the formula for the isentropic efficiency of the compressor ( η C ) . η C = h 2 s − h 1 h 2 − h 1 η C = T 2 s − T 1 T 2 − T 1 (III) Here, specific enthalpy at the compressor inlet is h 1 , specific enthalpy at the isentropic exit of compressor is h 2 s , specific enthalpy at the actual exit of compressor is h 2 , and the temperature at the actual exit of compressor is T 2 (b) To determine The coefficient of performance for the ideal gas refrigeration cycle. (c) To determine The mass flow rate of the helium for the ideal gas refrigeration cycle.

8th Edition

ISBN: 9780073398174

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

Publisher: McGraw-Hill Education

See similar textbooks

Videos

Question

Chapter 11.10, Problem 73P

(a)

To determine

The minimum temperature in the ideal gas refrigeration cycle.

(b)

To determine

The coefficient of performance for the ideal gas refrigeration cycle.

(c)

To determine

The mass flow rate of the helium for the ideal gas refrigeration cycle.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 11.10, Problem 71P

Chapter 11.10, Problem 74P

Students have asked these similar questions

Which of the following sequences converge and which diverge? n+1 6) a = 1- 2n (-1)+1 7) a = 2n-1 2n 8) an = n+1 1 9) a = sin + 2 n sin n 10) a = n 11) an = 12) a = 13) an 14) an 15) an 16) an n 2" In(n+1) = 81/n n n =(1+7)" = = 10n 3 n 1/n 17) an = In n 1/n n' 18) a =√4"n

Qu 3 Nickel (Ni) single crystal turbine blades burn less fuel at higher temperatures because blades are grown on [110] closed packed direction. Nickel (Ni) at 20°C is FCC, and has an atomic radius, R, of 0.125 nm. Draw a reduced-sphere unit cell for this crystal and draw and label the vector [I 10], starting from the origin (0, 0, 0). a) Calculate the length of the vector [| 10] in nanometers. Express your answer in nanometers to one significant figure. b) Calculate the linear density of Nickel in the [| 1 0] direction in [atom/nm]. Express your answer in atoms/nm to one significant figure. show all work problems

handwritten-solutions, please!

Chapter 11 Solutions

Thermodynamics: An Engineering Approach

Ch. 11.10 - Why is the reversed Carnot cycle executed within...Ch. 11.10 - Why do we study the reversed Carnot cycle even...Ch. 11.10 - 11–3 A steady-flow Carnot refrigeration cycle uses...Ch. 11.10 - Does the ideal vapor-compression refrigeration...Ch. 11.10 - Why is the throttling valve not replaced by an...Ch. 11.10 - It is proposed to use water instead of...Ch. 11.10 - In a refrigeration system, would you recommend...Ch. 11.10 - Does the area enclosed by the cycle on a T-s...Ch. 11.10 - Consider two vapor-compression refrigeration...Ch. 11.10 - The COP of vapor-compression refrigeration cycles...

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.