Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781260048766
Author: CENGEL
Publisher: MCG
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Chapter 3.8, Problem 128RP
On the property diagrams indicated below, sketch (not to scale) with respect to the saturated liquid and saturated vapor lines and label the following processes and states for refrigerant-134a. Use arrows to indicate the direction of the process, and label the initial and final states:
- (a) On the P-v diagram, sketch the constant-temperature process through the state P = 280 kPa, v = 0.06 m3/kg as pressure changes from P1 = 400 kPa to P2 = 200 kPa. Place the value of the temperature on the process curve on the P-v diagram.
- (b) On the T-v diagram, sketch the constant-specific-volume process through the state T = 20°C, v = 0.02 m3/kg from P1 = 1200 kPa to P2 = 300 kPa. For this data set, place the temperature values at states 1 and 2 on its axis. Place the value of the specific volume on its axis.
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Students have asked these similar questions
The diagram presented represents a thermodynamic process experienced by 27.5mmol (millimoles) of a monatomic ideal gas. The volume axis is divided into equal increments υ0=777cm3 while the pressure axis is divided into equal increments p0=0.301atm.
Part (a) How much work, in joules, does the gas perform on its environment during the thermodynamic process represented in the diagram?
Part (b) What is the change, in joules, of the internal energy of the gas during the process represented in the diagram?
Part (c) How much heat, in joules, is absorbed by the gas during the process represented in the diagram?
A cylinder-piston assembly initially contains water at 3 MPa and 300°C. The
water is cooled at constant volume to 200 °C, and then compressed isothermally
to a final pressure of 2.5 MPa. Sketch the process on a T-v diagram and find the
specific volume at the 3 states. [Ans. 0.081l m kg. 0.0811, 1.155x10 m kg]
Consider the following table for Refrigerant-134a.
Required:
а)
Complete the table and show all analyses in detail for each condition (Use "not
applicable" whenever it is needed)
b)
Draw P-u (Pressure-Specific enthalpy) and T-u diagrams for each condition. Show
states and clearly label all data (P,u, and T ) on the diagrams with respect to the dome.
Number
T (°C)
P (kPa)
U (kJ/kg)
Phase
I
-6
125
ii
35
220
Chapter 3 Solutions
Thermodynamics: An Engineering Approach
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