Concept explainers
(a)
The entropy change of the computer chips.
(a)

Explanation of Solution
Given:
The mass of the computer chips
The specific heat of the computer chips
The initial temperature of the computer chips
The final temperature of the computer chips
The mass of the refrigerant liquid
Calculation:
Calculate the heat released by the computer chips.
Refer the Table A-11 “Saturated refrigerant-134a—Temperature table”, to obtain the below properties for the at final temperature of
Calculate the mass of the refrigerant vaporized during this heat exchange process.
Write the expression for the energy balance equation.
Here, the total energy entering the system is
Substitute
Here, the mass is
Small fraction of the refrigerant us vaporized during the process so the the mass of the refrigerant liquid at state 1 and state 2 are same
Calculate the change in the entropy of the R-134a.
Thus, the entropy change of the computer chips is
Calculate the entropy change of the computer chips.
Thus, the entropy change of the R-134 is
Calculate the total entropy change of the entire system.
Thus, the entropy change of the entire system is
(b)
The entropy change of the R-134.
(b)

Explanation of Solution
Calculate the entropy change of the computer chips.
Thus, the entropy change of the R-134 is
(c)
The entropy change of the entire system.
(c)

Explanation of Solution
Calculate the total entropy change of the entire system.
Thus, the entropy change of the entire system is
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Chapter 8 Solutions
Fundamentals Of Thermal-fluid Sciences In Si Units
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