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7.134E R-134a at 90 F, 125 psia is throttled in a steady flow to a lower pressure, so it comes out at 10 F. What is the specific entropy generation?

7.134E R-134a at 90 F, 125 psia is throttled in a steady flow to a lower pressure, so it comes out at 10 F. What is the specific entropy generation?

Elements Of Electromagnetics
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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**Problem 7.134E** R-134a at 90°F, 125 psia is throttled in a steady flow to a lower pressure, so it comes out at 10°F. What is the specific entropy generation? **Explanation:** In this problem, a refrigerant (R-134a) undergoes a throttling process. Initially, it is at a temperature of 90°F and a pressure of 125 psia. It is then expanded through a throttling device, resulting in a lower pressure and a lower outlet temperature of 10°F. The task is to determine the specific entropy generation during this process. The problem involves concepts of thermodynamics, specifically entropy changes in a throttling process. Throttling is an isenthalpic process, meaning the enthalpy remains constant, which can be useful in finding entropy changes. Solutions typically involve using refrigerant tables or software to find relevant thermodynamic properties and applying the second law of thermodynamics to calculate the entropy generation.
Transcribed Image Text:**Problem 7.134E** R-134a at 90°F, 125 psia is throttled in a steady flow to a lower pressure, so it comes out at 10°F. What is the specific entropy generation? **Explanation:** In this problem, a refrigerant (R-134a) undergoes a throttling process. Initially, it is at a temperature of 90°F and a pressure of 125 psia. It is then expanded through a throttling device, resulting in a lower pressure and a lower outlet temperature of 10°F. The task is to determine the specific entropy generation during this process. The problem involves concepts of thermodynamics, specifically entropy changes in a throttling process. Throttling is an isenthalpic process, meaning the enthalpy remains constant, which can be useful in finding entropy changes. Solutions typically involve using refrigerant tables or software to find relevant thermodynamic properties and applying the second law of thermodynamics to calculate the entropy generation.
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