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Saturated vapor R-134a at 500 kPa is throttled to 200 kPa in a steady flow through a valve The kinetic energy in the inlet and exit flow is the same. What is the exit temperature?

Saturated vapor R-134a at 500 kPa is throttled to 200 kPa in a steady flow through a valve The kinetic energy in the inlet and exit flow is the same. What is the exit temperature?

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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**Throttling Process for R-134a** **Problem Statement:** Saturated vapor R-134a at 500 kPa is throttled to 200 kPa in a steady flow through a valve. The kinetic energy in the inlet and exit flow is the same. What is the exit temperature? --- This problem involves a throttling process, where a fluid undergoes a pressure drop without a change in enthalpy, and no work is done. In this case, R-134a, a refrigerant, is used. **Key Concepts:** 1. **Throttling Process:** - No heat transfer, no work done. - Enthalpy remains constant. - Often used in refrigeration cycles. 2. **Given Values:** - Initial Condition: Saturated vapor at 500 kPa. - Final Condition: Pressure is reduced to 200 kPa. - Same kinetic energy at inlet and outlet. 3. **Objective:** - Determine the exit temperature after the throttling process. **Approach:** - Use the steam table or refrigerant table for R-134a to find the properties of the fluid at the initial pressure. - Enthalpy before throttling (inlet) is equal to enthalpy after throttling (exit). - Look up the enthalpy at 500 kPa to find the corresponding temperature after throttling at 200 kPa. This fundamental understanding helps to apply the principles of thermodynamics and the behavior of refrigerants in practical applications.
Transcribed Image Text:**Throttling Process for R-134a** **Problem Statement:** Saturated vapor R-134a at 500 kPa is throttled to 200 kPa in a steady flow through a valve. The kinetic energy in the inlet and exit flow is the same. What is the exit temperature? --- This problem involves a throttling process, where a fluid undergoes a pressure drop without a change in enthalpy, and no work is done. In this case, R-134a, a refrigerant, is used. **Key Concepts:** 1. **Throttling Process:** - No heat transfer, no work done. - Enthalpy remains constant. - Often used in refrigeration cycles. 2. **Given Values:** - Initial Condition: Saturated vapor at 500 kPa. - Final Condition: Pressure is reduced to 200 kPa. - Same kinetic energy at inlet and outlet. 3. **Objective:** - Determine the exit temperature after the throttling process. **Approach:** - Use the steam table or refrigerant table for R-134a to find the properties of the fluid at the initial pressure. - Enthalpy before throttling (inlet) is equal to enthalpy after throttling (exit). - Look up the enthalpy at 500 kPa to find the corresponding temperature after throttling at 200 kPa. This fundamental understanding helps to apply the principles of thermodynamics and the behavior of refrigerants in practical applications.
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