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A piston-cylinder device contains 25 g of saturated water vapor which is maintained at a constant pressure of 300 kPa. The system is defined as shown as the dashed line in the figure below. A resistance heater within the system is turned on and transfers 7.2 kJ of energy into the system. At the same time, a heat loss of 3.7 kJ occurs. (a) In what form of energy interaction, heat or work, does the resistance heater (d) add energy, and why? (b) Draw a P-v diagram for this process. (c) Write the first law for this process. Simplify your equation by incorporating the property enthalpy. Justify any approximations you make. Use the result of (c) to determine the final temperature of the steam. m=25 g (water) Sat. Vapor P=300 kPa (const) Qloss=3.7 kJ I System Resistance heater 7.2 kJ into system

A piston-cylinder device contains 25 g of saturated water vapor which is maintained at a constant pressure of 300 kPa. The system is defined as shown as the dashed line in the figure below. A resistance heater within the system is turned on and transfers 7.2 kJ of energy into the system. At the same time, a heat loss of 3.7 kJ occurs. (a) In what form of energy interaction, heat or work, does the resistance heater (d) add energy, and why? (b) Draw a P-v diagram for this process. (c) Write the first law for this process. Simplify your equation by incorporating the property enthalpy. Justify any approximations you make. Use the result of (c) to determine the final temperature of the steam. m=25 g (water) Sat. Vapor P=300 kPa (const) Qloss=3.7 kJ I System Resistance heater 7.2 kJ into system

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
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A piston-cylinder device contains 25 g of saturated water vapor which is maintained at a constant pressure of 300 kPa. The system is defined as shown as the dashed line in the figure below. A resistance heater within the system is turned on and transfers 7.2 kJ of energy into the system. At the same time, a heat loss of 3.7 kJ occurs. (a) In what form of energy interaction, heat or work, does the resistance heater add energy, and why? (b) Draw a \( P - \nu \) diagram for this process. (c) Write the first law for this process. Simplify your equation by incorporating the property enthalpy. Justify any approximations you make. (d) Use the result of (c) to determine the final temperature of the steam. **Diagram Explanation:** The diagram shows a piston-cylinder system containing saturated water vapor with a mass of 25 g at a constant pressure of 300 kPa. Inside the system, a resistance heater is depicted, which adds 7.2 kJ of energy into the system. An arrow labeled \( Q_{\text{loss}} = 3.7 \, \text{kJ} \) indicates a heat loss from the system. The dashed line represents the boundary of the system.
Transcribed Image Text:A piston-cylinder device contains 25 g of saturated water vapor which is maintained at a constant pressure of 300 kPa. The system is defined as shown as the dashed line in the figure below. A resistance heater within the system is turned on and transfers 7.2 kJ of energy into the system. At the same time, a heat loss of 3.7 kJ occurs. (a) In what form of energy interaction, heat or work, does the resistance heater add energy, and why? (b) Draw a \( P - \nu \) diagram for this process. (c) Write the first law for this process. Simplify your equation by incorporating the property enthalpy. Justify any approximations you make. (d) Use the result of (c) to determine the final temperature of the steam. **Diagram Explanation:** The diagram shows a piston-cylinder system containing saturated water vapor with a mass of 25 g at a constant pressure of 300 kPa. Inside the system, a resistance heater is depicted, which adds 7.2 kJ of energy into the system. An arrow labeled \( Q_{\text{loss}} = 3.7 \, \text{kJ} \) indicates a heat loss from the system. The dashed line represents the boundary of the system.
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