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Dr. Munzer Ebaid. 1. Chapter (4). ENERGY ANALYSIS OF. CLOSED SYSTEMS. Thermodynamics: An Engineering Approach, 6th Edition. Yunus A. Cengel ...
Thermodynamics: An Engineering Approach, 6th Edition Yunus A. Cengel, Michael A. Boles McGraw-Hill, 2008

Chapter (4)

ENERGY ANALYSIS OF CLOSED SYSTEMS

SOLVED PROBLEMS Dr. MUNZER EBAID Dr. Munzer Ebaid

1

Boundary Work Problems

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2

Problem (4-7)

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3

Problem (4-12)

Given :

R − 134a (saturated Liquid ) p1 = p2 = 900 kPa

V1 = 200 L = 0.2 m 3

Find Boundary Work?

Q

Dr. Munzer Ebaid

4

Problem (4-12)

At p2 = 900 kPa, Tsat = 35.51C

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5

Problem (4-21)

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6

Problem (4-25)

Superheated region

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Tsat @ p =800 = 170.41 oC

7

Closed System Energy Analysis

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8

Problem (4-30)

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9

Problem (4-32)

=1.5W

Q&

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=1.0W

10

Closed System Energy Analysis Ideal Gases

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11

Problem (4-65) Determine the internal energy change when the membrane is ruptured. Determine the final air pressure when the membrane is ruptured.

Adiabatic Process

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12

Problem (4-65)

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13

Problem (4-69)

Given : p1 = 200 kPa , p2 = 50 kPa

T1 = T2 = 50 C (Isothermal process )

Q = 1500 kJ

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14

Problem (4-69)

=1500 kJ

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15

Closed System Energy Analysis Solids and Liquids

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16

Problem (4-82) Given : T1 = 20 C , T2 = 80 C

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17

Problem (4-86)

Steel Balls are heated to T = 900 oC and then cooled to T = 100 oC at an air temperature of Tair = 25 oC

Dr. Munzer Ebaid

d Ball = 8 mm

18

Problem (4-86)

Q Transfered

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19

THE END

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