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 100LD

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 100LD

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Calculate the pressure, P3, of the R-134a in state 3.

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.
Calculate the pressure, P3, of the R-134a in state 3.
Spring 2
Spring 1
h2
h,
Piston
he
R-134a

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