Concept explainers
Complete each line of the following table on the basis of the conservation of energy principle for a closed system.
Qin kJ |
Wout kJ |
E1 kJ |
E2 kJ |
m kg |
e2 – e1 kJ/kg |
280 | — | 1020 | 860 | 3 | — |
−350 | 130 | 550 | — | 5 | — |
— | 260 | 300 | — | 2 | −150 |
300 | — | 750 | 500 | 1 | — |
— | −200 | — | 300 | 2 | −100 |
FIGURE P4–29
Fill the blanks from the below table on the basis of the conservation of energy principle for a closed system.
280 | 1020 | 860 | 3 | ||
130 | 550 | 5 | |||
260 | 300 | 2 | –150 | ||
750 | 500 | 1 | |||
300 | 2 |
Explanation of Solution
Write the energy balance equation for closed system.
Here, energy transfer in to the control volume is
Substitute
Here, amount of heat transfer into the system is
Substitute
Here, initial and final internal energy are
Conclusion:
For row I
Substitute
Substitute
For row II
Substitute
Substitute
For row III
Substitute
Substitute
For row IV
Substitute
Substitute
For row V
Substitute
Substitute
The following table blanks are filled and are shown below as summarized.
280 | 1020 | 860 | 3 | ||
130 | 550 | 5 | |||
260 | 300 | 2 | –150 | ||
750 | 500 | 1 | |||
300 | 2 |
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Chapter 4 Solutions
THERMODYNAMICS: AN ENGINEERING APPROACH
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