1 MECE2320U-THERMODYNAMICS HOMEWORK # 5 Instructor: Dr. Ibrahim Dincer Assignment Date: Thursday, 22 October 2015 Assignment Type: Individual Due Date: Thursday, 29 October 2015 (3.00 pm latest, leave in dropbox 8) 1) As shown in figure, the inlet and outlet conditions of a steam turbine are given. The heat loss from turbine is 35 kJ per kg of steam. a) Show all the state points on T-v diagram b) Write mass and energy balance equations c) Calculate the turbine work 2) As shown in figure, refrigerant R134a enters to a compressor. Write both mass and energy balance equations. Calculate the compressor work and the mass flow rate of refrigerant. 3) As shown in figure, the heat exchanger uses the heat of hot exhaust gases to produce steam. Where, 15% of heat is lost to the surroundings. Exhaust gases enters the heat exchanger at 500°C. Water enters at 15°C as saturated liquid and exit at saturated vapor at 2 MPa. Mass flow rate of water is 0.025 kg/s, and for exhaust gases, it is 0.42 kg/s. The specific heat for exhaust gases is 1.045 kJ/kg K, which can be treated as ideal gas. 1 Turbine 2 ? 1 = 1 ??/? ?1 = 1 ??? ?1 = 300 ℃ ?1 = 40 ?/? ? ??? =? ????? = 35 ??/?? ?2 = 150 ??? ?2 = 0.9 ?2 = 180 ?/? 1 Compressor 2 ???? ???? = 1.3 ?3/??? ?1 = 100 ??? ?1 = −20 ℃ ? ?? =? ? ???? = 3 ?? ?2 = 800 ??? ?2 = 60 ℃ 2 a) Write mass and energy balance equations. b) Calculate the rate of heat transfer to the water. c) Calculate the exhaust gases exit temperature. 4) As shown in figure, two refrigerant R134a streams mix in a mixing chamber. If the mass flow rate of cold stream is twice that of the hot stream. a) Write mass and energy balance equations. b) Calculate the temperature of the mixture at the exit of the mixing chamber c) Calculate the quality at the exit of the mixing chamber 5) As shown in figure, an air conditioning system requires airflow at the main supply duct at a rate of 140 m3/min. The velocity inside circular duct is not to exceed 9 m/s. Assume that the fan converts 85% of electrical energy it consumes into kinetic energy of air. a) Write mass and energy balance equations. b) Calculate the size of electric motor require to drive the fan c) Calculate the diameter of the main duct ?2 = 1 ??? ?2 = 90 ℃ ?1 = 1 ??? ?1 = 30 ℃ ?3 =? ?3 =? 140 ?3/??? 9 ?/? Air Fan

## 1 MECE2320U-THERMODYNAMICS HOMEWORK # 5 Instructor: Dr. Ibrahim Dincer Assignment Date: Thursday, 22 October 2015 Assignment Type: Individual Due Date: Thursday, 29 October 2015 (3.00 pm latest, leave in dropbox 8) 1) As shown in figure, the inlet and outlet conditions of a steam turbine are given. The heat loss from turbine is 35 kJ per kg of steam. a) Show all the state points on T-v diagram b) Write mass and energy balance equations c) Calculate the turbine work 2) As shown in figure, refrigerant R134a enters to a compressor. Write both mass and energy balance equations. Calculate the compressor work and the mass flow rate of refrigerant. 3) As shown in figure, the heat exchanger uses the heat of hot exhaust gases to produce steam. Where, 15% of heat is lost to the surroundings. Exhaust gases enters the heat exchanger at 500°C. Water enters at 15°C as saturated liquid and exit at saturated vapor at 2 MPa. Mass flow rate of water is 0.025 kg/s, and for exhaust gases, it is 0.42 kg/s. The specific heat for exhaust gases is 1.045 kJ/kg K, which can be treated as ideal gas. 1 Turbine 2 ? 1 = 1 ??/? ?1 = 1 ??? ?1 = 300 ℃ ?1 = 40 ?/? ? ??? =? ????? = 35 ??/?? ?2 = 150 ??? ?2 = 0.9 ?2 = 180 ?/? 1 Compressor 2 ???? ???? = 1.3 ?3/??? ?1 = 100 ??? ?1 = −20 ℃ ? ?? =? ? ???? = 3 ?? ?2 = 800 ??? ?2 = 60 ℃ 2 a) Write mass and energy balance equations. b) Calculate the rate of heat transfer to the water. c) Calculate the exhaust gases exit temperature. 4) As shown in figure, two refrigerant R134a streams mix in a mixing chamber. If the mass flow rate of cold stream is twice that of the hot stream. a) Write mass and energy balance equations. b) Calculate the temperature of the mixture at the exit of the mixing chamber c) Calculate the quality at the exit of the mixing chamber 5) As shown in figure, an air conditioning system requires airflow at the main supply duct at a rate of 140 m3/min. The velocity inside circular duct is not to exceed 9 m/s. Assume that the fan converts 85% of electrical energy it consumes into kinetic energy of air. a) Write mass and energy balance equations. b) Calculate the size of electric motor require to drive the fan c) Calculate the diameter of the main duct ?2 = 1 ??? ?2 = 90 ℃ ?1 = 1 ??? ?1 = 30 ℃ ?3 =? ?3 =? 140 ?3/??? 9 ?/? Air Fan

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Which of the following structures allows for gas exchange between the tissues of a leaf and the atmosphere?

## Which of the following structures allows for gas exchange between the tissues of a leaf and the atmosphere?

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One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell __________. A) an electric current is produced by a chemical reaction B) electrons flow toward the anode C) a nonspontaneous reaction is forced to occur D) O2 gas is produced at the cathode E) oxidation occurs at the cathode

## One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell __________. A) an electric current is produced by a chemical reaction B) electrons flow toward the anode C) a nonspontaneous reaction is forced to occur D) O2 gas is produced at the cathode E) oxidation occurs at the cathode

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Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxide gas, and water. Cu(s) + 4 HNO3(aq)  Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O() If you have 0.500 moles of Cu you need at least 2.00 moles of HNO3 to produce 0.500 moles of Cu(NO3)2. you need at least 2.00 moles of HNO3 to produce 1.00 moles of Cu(NO3)2. you need at least 2.00 moles of HNO3 to produce 2.00 moles of Cu(NO3)2. you need at least 0.250 moles of HNO3 to produce 0.500 moles of Cu(NO3)2. you need at least 0.125 moles of HNO3 to produce 0.500 moles of Cu(NO3)2.

## Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxide gas, and water. Cu(s) + 4 HNO3(aq)  Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O() If you have 0.500 moles of Cu you need at least 2.00 moles of HNO3 to produce 0.500 moles of Cu(NO3)2. you need at least 2.00 moles of HNO3 to produce 1.00 moles of Cu(NO3)2. you need at least 2.00 moles of HNO3 to produce 2.00 moles of Cu(NO3)2. you need at least 0.250 moles of HNO3 to produce 0.500 moles of Cu(NO3)2. you need at least 0.125 moles of HNO3 to produce 0.500 moles of Cu(NO3)2.

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The reaction of 50 mL of 2 Cl gas with 50 mL of 4 CH gas via the equation: 2 4 3 Cl (g) + CH (g)®HCl (g) + CH Cl (g) will produce a total of __________ mL of products if pressure and temperature are kept constant. A) 100 B) 50 C) 200 D) 150 E) 250

## The reaction of 50 mL of 2 Cl gas with 50 mL of 4 CH gas via the equation: 2 4 3 Cl (g) + CH (g)®HCl (g) + CH Cl (g) will produce a total of __________ mL of products if pressure and temperature are kept constant. A) 100 B) 50 C) 200 D) 150 E) 250

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Question 2 0 / 1 point The formation of our solar system began when electrons settled into orbit around hydrogen nuclei water condensed into an icy body a shock wave from a nearby exploding star started a cloud of dust and gas spinning all matter and energy exploded from a tiny singularity in the big bang

## Question 2 0 / 1 point The formation of our solar system began when electrons settled into orbit around hydrogen nuclei water condensed into an icy body a shock wave from a nearby exploding star started a cloud of dust and gas spinning all matter and energy exploded from a tiny singularity in the big bang

F6.1 Piloted ignition occurs when the lower flammable limit is reached in the gas phase in the vicinity of the ignition pilot. True False F6.2 The flashpoint of a liquid fuel is always lower than its boiling point. True False F6.3 The vapor concentration just above the surface of a boiling liquid is 100%. True False F6.4 The autoignition temperature of a liquid fuel is close to its boiling point. True False F6.5 Piloted ignition of solid fuels typically occurs at surface temperatures ranging from 250°C to 400°C, while autoignition temperatures usually exceed 500°C. True False F6.6 Except for very low heating conditions, the physical thickness of objects that exhibit “thin” piloted ignition behavior is typically of the order of 0.1-0.2 mm. 1-2 mm. 10-20 mm. F6.7 The time to piloted ignition of a “thin” object is proportional to the inverse of the net heat flux at its exposed surface. True False F6.8 The time to piloted ignition of a “thick” object is proportional to the inverse of the net heat flux at its exposed surface. True False