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3-37E A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation F= kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. Answers: 81.5°F, 120 Btu/lbm W Fluid -D- FIGURE P3-37E Spring

3-37E A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation F= kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. Answers: 81.5°F, 120 Btu/lbm W Fluid -D- FIGURE P3-37E Spring

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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**Transcription for Educational Website:** **Problem 3-37E:** A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation \( F = kx \) is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. **Answers:** 81.5°F, 120 Btu/lbm **Diagram Explanation:** The diagram labeled "FIGURE P3-37E" shows a vertical piston-cylinder device. Inside the cylinder, a spring is positioned above a fluid labeled as "Fluid." This represents the R-134a liquid-vapor mixture. The spring is compressed initially, indicating a potential for expansion. The cylinder has a defined piston diameter marked as \( D \).
Transcribed Image Text:**Transcription for Educational Website:** **Problem 3-37E:** A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation \( F = kx \) is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. **Answers:** 81.5°F, 120 Btu/lbm **Diagram Explanation:** The diagram labeled "FIGURE P3-37E" shows a vertical piston-cylinder device. Inside the cylinder, a spring is positioned above a fluid labeled as "Fluid." This represents the R-134a liquid-vapor mixture. The spring is compressed initially, indicating a potential for expansion. The cylinder has a defined piston diameter marked as \( D \).
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This is the only Superheated R-134a property table we are given, how do we find the final state of R-134a the superheated state from here?

 

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# Superheated Refrigerant-134a: Property Tables and Charts ## TABLE A-13E This table provides thermodynamic properties of superheated refrigerant-134a at various pressures and temperatures. The properties listed are: - **T (°F)**: Temperature in degrees Fahrenheit. - **\( u \) (Btu/lbm)**: Specific internal energy in British thermal units per pound mass. - **\( h \) (Btu/lbm)**: Specific enthalpy in British thermal units per pound mass. - **\( s \) (Btu/lbm R)**: Specific entropy in British thermal units per pound mass per degree Rankine. The table is divided into different sections, each for a specific pressure: - **\( P = 10 \text{ psia} (T_{\text{sat}} = -29.52°F)** - **\( P = 15 \text{ psia} (T_{\text{sat}} = -14.15°F)** - **\( P = 20 \text{ psia} (T_{\text{sat}} = 2.43°F)** - **\( P = 30 \text{ psia} (T_{\text{sat}} = 15.37°F)** - **\( P = 40 \text{ psia} (T_{\text{sat}} = 29.91°F)** - **\( P = 50 \text{ psia} (T_{\text{sat}} = 40.37°F)** - **\( P = 60 \text{ psia} (T_{\text{sat}} = 49.84°F)** - **\( P = 70 \text{ psia} (T_{\text{sat}} = 58.30°F)** - **\( P = 80 \text{ psia} (T_{\text{sat}} = 65.89°F)** ### Explanation of Data Columns: - **Sat.**: Denotes properties at saturation condition. - **Temperature (T°F)**: Represents the temperature at which the properties are measured. - **Specific Internal Energy (\( u \))**: Energy contained within the refrigerant due to the motions and interactions of its molecules. - **Specific Enthalpy (\( h \))**: Total heat content of the refrigerant, including internal energy and the product of pressure and volume. -
Transcribed Image Text:# Superheated Refrigerant-134a: Property Tables and Charts ## TABLE A-13E This table provides thermodynamic properties of superheated refrigerant-134a at various pressures and temperatures. The properties listed are: - **T (°F)**: Temperature in degrees Fahrenheit. - **\( u \) (Btu/lbm)**: Specific internal energy in British thermal units per pound mass. - **\( h \) (Btu/lbm)**: Specific enthalpy in British thermal units per pound mass. - **\( s \) (Btu/lbm R)**: Specific entropy in British thermal units per pound mass per degree Rankine. The table is divided into different sections, each for a specific pressure: - **\( P = 10 \text{ psia} (T_{\text{sat}} = -29.52°F)** - **\( P = 15 \text{ psia} (T_{\text{sat}} = -14.15°F)** - **\( P = 20 \text{ psia} (T_{\text{sat}} = 2.43°F)** - **\( P = 30 \text{ psia} (T_{\text{sat}} = 15.37°F)** - **\( P = 40 \text{ psia} (T_{\text{sat}} = 29.91°F)** - **\( P = 50 \text{ psia} (T_{\text{sat}} = 40.37°F)** - **\( P = 60 \text{ psia} (T_{\text{sat}} = 49.84°F)** - **\( P = 70 \text{ psia} (T_{\text{sat}} = 58.30°F)** - **\( P = 80 \text{ psia} (T_{\text{sat}} = 65.89°F)** ### Explanation of Data Columns: - **Sat.**: Denotes properties at saturation condition. - **Temperature (T°F)**: Represents the temperature at which the properties are measured. - **Specific Internal Energy (\( u \))**: Energy contained within the refrigerant due to the motions and interactions of its molecules. - **Specific Enthalpy (\( h \))**: Total heat content of the refrigerant, including internal energy and the product of pressure and volume. -
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