Monday, 4/25/11 at 9AM in SMT 354.

Please post any questions you have relating to the 1st test as comments on this blog entry.

Test 1 covers Ch 1-5 in Cengel & Boles and in LearnThermo.com.

Best of luck !

Dr. B

## Saturday, April 23, 2011

## Wednesday, April 20, 2011

### ENGR 224 - HW #4

This HW covers CB chapter 6 or LT chapter 6.

The homework consists of 8 problems for a total of 45 pts.

Please begin your question with the problem number you are asking about.

Cengel & Boles: Ch 6:

6.79 - Effect of Source and Sink Temperatures on HE Efficiency - 6 pts

6.85 - Thermal Efficiency of a Geothermal Power Plant - 3 pts

6.107 - Carnot HE Used to Drive a Carnot Refrigerator - 6 pts

6.110 - Actual and Maximum COP of an Air-Conditioner - 8 pts

6.134 - Thermal Efficiency of Heat Engines in Series - 4 pts

Special Problems

WB-1 - "Show That" Problem Using the K-P Statement of the 2nd Law - 6 pts

WB-2 - Reversible, Irreversible and Impossible Power Cycles - 6 pts

WB-3 - A Reversible HE Used to Drive a Reversible Heat Pump - 6 pts

The homework consists of 8 problems for a total of 45 pts.

Please begin your question with the problem number you are asking about.

Cengel & Boles: Ch 6:

6.79 - Effect of Source and Sink Temperatures on HE Efficiency - 6 pts

6.85 - Thermal Efficiency of a Geothermal Power Plant - 3 pts

6.107 - Carnot HE Used to Drive a Carnot Refrigerator - 6 pts

6.110 - Actual and Maximum COP of an Air-Conditioner - 8 pts

6.134 - Thermal Efficiency of Heat Engines in Series - 4 pts

Special Problems

WB-1 - "Show That" Problem Using the K-P Statement of the 2nd Law - 6 pts

WB-2 - Reversible, Irreversible and Impossible Power Cycles - 6 pts

WB-3 - A Reversible HE Used to Drive a Reversible Heat Pump - 6 pts

## Wednesday, April 13, 2011

### ENGR 224 - HW #3

This HW covers CB chapter 5 or LT chapter 5.

The homework consists of 10 problems for a total of 65 pts.

Please begin your question with the problem number you are asking about.

Cengel & Boles, Ch 5:

5.35 - Adiabatic Steam Nozzle - 5 pts

5.54 - Adiabatic Gas Turbine - 5 pts

5.112 - Steam Flow in a HEX Tube - 5 pts

5.138 - Filling a Balloon with Helium - 10 pts

5.142 - Charging a Cylinder with a Spring-Loaded Piston - 8 pts

Special Problems

WB-1 - Effluent Pressure in a Non-Adiabatic Steam Diffuser - 5 pts

WB-2 - Steady-State, Polytropic Air Compressor - 5 pts

WB-3 - Analysis of a Two-Stage, Adiabatic Turbine - 6 pts

WB-4 - Analysis of an Adiabatic Steam De-Superheater - 8 pts

WB-5 - Waste Heat Steam Generator - 8 pts

The homework consists of 10 problems for a total of 65 pts.

Please begin your question with the problem number you are asking about.

Cengel & Boles, Ch 5:

5.35 - Adiabatic Steam Nozzle - 5 pts

5.54 - Adiabatic Gas Turbine - 5 pts

5.112 - Steam Flow in a HEX Tube - 5 pts

5.138 - Filling a Balloon with Helium - 10 pts

5.142 - Charging a Cylinder with a Spring-Loaded Piston - 8 pts

Special Problems

WB-1 - Effluent Pressure in a Non-Adiabatic Steam Diffuser - 5 pts

WB-2 - Steady-State, Polytropic Air Compressor - 5 pts

WB-3 - Analysis of a Two-Stage, Adiabatic Turbine - 6 pts

WB-4 - Analysis of an Adiabatic Steam De-Superheater - 8 pts

WB-5 - Waste Heat Steam Generator - 8 pts

## Wednesday, April 06, 2011

### ENGR 224 - HW #2

This HW covers CB chapters 2, 4 and parts of 6 or LT chapters 3 & 4.

The homework consists of 16 problems for a total of 57 pts.

Please begin your question with the problem number you are asking about.

Cengel & Boles: Ch 3:

3.26(2pts) -

Use either the NIST Webbook or the Thermal/Fluids Toolbox (TFT) Excel plug-in.

Use the default reference state for both the NIST and TFT.

3.29E(2pts) -

Use either the NIST Webbook or the Thermal/Fluids Toolbox (TFT) Excel plug-in.

Use the default reference state for both the NIST and TFT.

Cengel & Boles: Ch 4:

4.8(6pts) : W ~ -22 kJ

4.42(5pts) : Q ~ 12750 kJ

4.59E(4pts) : See textbook

4.60(4pts) : ΔU ~ 6200 Btu/lbm

Special Problems

WB-1(5pts) : ΔHvap ~ 575 to 600 Btu/lbm

WB-2(8pts) : ΔH14 ~ 9900 J

WB-3(6pts): Q23 ~ -85 Btu , Wcycle ~ -20 Btu

WB-4(3pts) : q ~ -97 Btu/h-ft2

WB-5(3pts) : Q ~ 3500 W

WB-6(3pts) : Lins ~ 6 cm

WB-7(3pts) : Wb ~ 350 kJ

Cengel & Boles: Ch 6: 6.23(2pts), 6.41(2pts), 6.55(2pts). These problems should be pretty easy.

The homework consists of 16 problems for a total of 57 pts.

Please begin your question with the problem number you are asking about.

Cengel & Boles: Ch 3:

3.26(2pts) -

Use either the NIST Webbook or the Thermal/Fluids Toolbox (TFT) Excel plug-in.

Use the default reference state for both the NIST and TFT.

3.29E(2pts) -

Use either the NIST Webbook or the Thermal/Fluids Toolbox (TFT) Excel plug-in.

Use the default reference state for both the NIST and TFT.

Cengel & Boles: Ch 4:

4.8(6pts) : W ~ -22 kJ

4.42(5pts) : Q ~ 12750 kJ

4.59E(4pts) : See textbook

4.60(4pts) : ΔU ~ 6200 Btu/lbm

Special Problems

WB-1(5pts) : ΔHvap ~ 575 to 600 Btu/lbm

WB-2(8pts) : ΔH14 ~ 9900 J

WB-3(6pts): Q23 ~ -85 Btu , Wcycle ~ -20 Btu

WB-4(3pts) : q ~ -97 Btu/h-ft2

WB-5(3pts) : Q ~ 3500 W

WB-6(3pts) : Lins ~ 6 cm

WB-7(3pts) : Wb ~ 350 kJ

Cengel & Boles: Ch 6: 6.23(2pts), 6.41(2pts), 6.55(2pts). These problems should be pretty easy.

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