Determine the mass of the R-134a. A piston-cylinder system contains R-134a as shown in the figure. Two linear springs with the samespring constant but different lengths are installed above the frictionless piston. Initially (state 1)the piston is motionless and floating so that the top of the piston is 2 cm from the bottom of Spring1 and 5 cm from the bottom of Spring 2. In this initial state the R-134a has a temperature of T, =-20°C and a quality of 70%. Heat is added to the system causing the piston to rise until it justtouches Spring 1, but Spring 1 exerts no force on the piston. In this state (state 2), the R-134a hasa volume V2 = 30 L. Heating continues until the temperature reaches T3 = 50 °C and Spring 1 iscompressed until the piston just touches Spring 2, but Spring 2 exerts no force on the piston (State3). Heating continues again, compressing both springs until a final pressure is reached (state 4) ofP4 = 190 kPa. The cross-sectional area of the piston is 0.3 m.Determine the mass of the R-134a.Spring 2Spring 1h2h,PistonheR-134a

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Answered: Determine the mass of the R-134a.

Engineering

Mechanical Engineering

Determine the mass of the R-134a.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Chemical and Phase Equilibrium

Phase diagrams or equilibrium phase diagrams are the graphical representations that show the phase transformations of the constituting elements with respect to the pressure, temperature, and compositions. The diagrams show the conditions that limit the different phases, namely solid, liquid, and gas. The diagram can also be utilized to verify the relations between the state variables. Most of the phase diagrams are temperature-pressure phase diagrams, with the variable parameter as the composition. Usually other variables such as solubility and pressure parameters are not indicated in the phase diagram. For a one-component system (unary phase diagram), the phase diagram is generally a function of temperature and pressure as the state variables, or temperature and volume. However, for a binary system (two-phase) having two components, the phase diagram is a function of temperature and composition as the state variables only. Coexisting of the different phases of the constituting elements is indicated in the phase diagram. A ternary phase diagram can be characterized by consisting of three phases in equilibrium.

Question

Determine the mass of the R-134a.

A piston-cylinder system contains R-134a as shown in the figure. Two linear springs with the same
spring constant but different lengths are installed above the frictionless piston. Initially (state 1)
the piston is motionless and floating so that the top of the piston is 2 cm from the bottom of Spring
1 and 5 cm from the bottom of Spring 2. In this initial state the R-134a has a temperature of T, =
-20°C and a quality of 70%. Heat is added to the system causing the piston to rise until it just
touches Spring 1, but Spring 1 exerts no force on the piston. In this state (state 2), the R-134a has
a volume V2 = 30 L. Heating continues until the temperature reaches T3 = 50 °C and Spring 1 is
compressed until the piston just touches Spring 2, but Spring 2 exerts no force on the piston (State
3). Heating continues again, compressing both springs until a final pressure is reached (state 4) of
P4 = 190 kPa. The cross-sectional area of the piston is 0.3 m.
Determine the mass of the R-134a.
Spring 2
Spring 1
h2
h,
Piston
he
R-134a

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