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Which of the following is prohibited by the 2nd law of thermodynamics? A device that uses...
Second Law of Thermodynamics Learning Goal: To understand the implications of the second law of thermodynamics...
Second Law of Thermodynamics Learning Goal: To understand the implications of the second law of thermodynamics. The second law of thermodynamics explains the direction in which the thermodynamic processes tend to go. That is, it limits the types of final states of the system that naturally evolve from a given initial state. The second law has many practical applications. For example it explains the limits of efficiency for heat engines and refrigerators. To develop a better understanding of this law,...
Which statement can be attributed to the 2nd Law of Thermodynamics? a For any real process,...
Which statement can be attributed to the 2nd Law of Thermodynamics? a For any real process, energy is conserved. b For any real process, entropy is conserved. c Energy flow has a direction. d Energy has a magnitude. Entropy change across a pump used in a certain practical application was found out to have a negative value. Which of the below statement is true? a The entropy generation across the pump is negative. b There is heat loss from the...
is Spring 19 5.1 For a device operating on a cycle has to comply with either the Kelvin-Planck Statement or the Clausius Statement of the Second Law of Thermodynamics (a) True(b) False (a) It gai...
is Spring 19 5.1 For a device operating on a cycle has to comply with either the Kelvin-Planck Statement or the Clausius Statement of the Second Law of Thermodynamics (a) True(b) False (a) It gained 1000 KJ by heat (b) It gained 1000KJ by net work input only (c) It gained 5.2 The internal energy of a closed system increases by 1000 KJ. This is due to: 1000KJ by a combination of heat and work input (d) Depending on the...
Problem 1 (10 points). Consider a newly invented power cyclic device performing a power cycle whi...
Problem 1 (10 points). Consider a newly invented power cyclic device performing a power cycle while interacting with two thermal reservoirs. The device absorbs 2000 kJ from the hight temperature reservoir at 1000 K, and releases certain amount of heat to the low temperature reservoir at 500 K. Now consider three claims on its thermal efficiency or per ormance: η 70, η 0%, and Y-40%. (a, 4 points) Formulate the entropy production for the cyclic process in terms of the...
Cooling tower is a special recycling device which applies the heat rejection process. Figure Q4 (a)...
Cooling tower is a special recycling device which applies the heat rejection process. Figure Q4 (a) shows the cooling tower system that extracts waste heat to the atmosphere through the cooling of a water stream to a lower temperature. Sketch the water recycle in the cooling tower Q4 (a) (5 marks) High leaving water temperature will cause a drop in process cooling efficiency, increasing system power consumption, creating physical discomfort to people within an air-conditioned area, and have a detrimental...
Which of the following is correct regarding the zeroth law of thermodynamics? Select one: O a....
Which of the following is correct regarding the zeroth law of thermodynamics? Select one: O a. it describes how a system changes its state by only focusing on the initial and final state without regard how the final state is achieved. O b. it deals with all modes of thermodynamic equilibrium between bodies. O c. it is about thermal equilibrium among bodies. O d. it is concerned with energy conservation where essentially energy only changes its form. O e. it...
2 Thermodynamics Equations (Cycles) • Solve the following problems from the textbook (Thermodynamics: An Engineering Approach,...
2
Thermodynamics Equations (Cycles)
• Solve the following problems from the textbook (Thermodynamics: An Engineering Approach, by Yunus A. Cengel and Michael A. Boles, 8th Edition, SI Version, 2015): Gas Power Cycles: Obtain problem statements from the textbook Air-Standard Cycles (Otto Cycles) Problems No.: 9-32 An ideal Otto cyele has a compression ratio of 8. At the beginning of the compression process, air at 95 kPa and 27°C, and 750 kJ/kg of heat is transferred to air during the constant-...
Please show work for A 1-4! 1. Heat engines A heat engine is a device that...
Please show work for A 1-4!
1. Heat engines A heat engine is a device that does work by exchanging thermal energy with its environment. All heat engines operate in cycles during which a system, also known as the working substance, passes through a series of thermodynamic processes returning repeatedly to each state. A. Device 1, shown at right, represents a heat engine operating between 900 K reservoirs at 900 K and 400 K. (The system interacting with the reservoirs...
please help thermodynamics a) Explain the methods that can be adopted to increase the thermal efficiency...
please help thermodynamics
a) Explain the methods that can be adopted to increase the thermal efficiency of a vapor power cycle. You may use a T-s diagram to explain your reasons. b) A steam regenerative cycle, shown below, is delivering 100 MW of power. Steam from the boller is supplied to the turbine at 8 MPa. 400°C. After expanding isentropically in the 1st stage turbine to a pressure of 1 MPa, steam is taken to the reheater where Its temperature...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
is Spring 19 5.1 For a device operating on a cycle has to comply with either the Kelvin-Planck Statement or the Clausius Statement of the Second Law of Thermodynamics (a) True(b) False (a) It gained 1000 KJ by heat (b) It gained 1000KJ by net work input only (c) It gained 5.2 The internal energy of a closed system increases by 1000 KJ. This is due to: 1000KJ by a combination of heat and work input (d) Depending on the...
Problem 1 (10 points). Consider a newly invented power cyclic device performing a power cycle while interacting with two thermal reservoirs. The device absorbs 2000 kJ from the hight temperature reservoir at 1000 K, and releases certain amount of heat to the low temperature reservoir at 500 K. Now consider three claims on its thermal efficiency or per ormance: η 70, η 0%, and Y-40%. (a, 4 points) Formulate the entropy production for the cyclic process in terms of the...
Cooling tower is a special recycling device which applies the heat rejection process. Figure Q4 (a) shows the cooling tower system that extracts waste heat to the atmosphere through the cooling of a water stream to a lower temperature. Sketch the water recycle in the cooling tower Q4 (a) (5 marks) High leaving water temperature will cause a drop in process cooling efficiency, increasing system power consumption, creating physical discomfort to people within an air-conditioned area, and have a detrimental...
Which of the following is correct regarding the zeroth law of thermodynamics? Select one: O a. it describes how a system changes its state by only focusing on the initial and final state without regard how the final state is achieved. O b. it deals with all modes of thermodynamic equilibrium between bodies. O c. it is about thermal equilibrium among bodies. O d. it is concerned with energy conservation where essentially energy only changes its form. O e. it...
2
Thermodynamics Equations (Cycles)
• Solve the following problems from the textbook (Thermodynamics: An Engineering Approach, by Yunus A. Cengel and Michael A. Boles, 8th Edition, SI Version, 2015): Gas Power Cycles: Obtain problem statements from the textbook Air-Standard Cycles (Otto Cycles) Problems No.: 9-32 An ideal Otto cyele has a compression ratio of 8. At the beginning of the compression process, air at 95 kPa and 27°C, and 750 kJ/kg of heat is transferred to air during the constant-...
Please show work for A 1-4!
1. Heat engines A heat engine is a device that does work by exchanging thermal energy with its environment. All heat engines operate in cycles during which a system, also known as the working substance, passes through a series of thermodynamic processes returning repeatedly to each state. A. Device 1, shown at right, represents a heat engine operating between 900 K reservoirs at 900 K and 400 K. (The system interacting with the reservoirs...
please help thermodynamics
a) Explain the methods that can be adopted to increase the thermal efficiency of a vapor power cycle. You may use a T-s diagram to explain your reasons. b) A steam regenerative cycle, shown below, is delivering 100 MW of power. Steam from the boller is supplied to the turbine at 8 MPa. 400°C. After expanding isentropically in the 1st stage turbine to a pressure of 1 MPa, steam is taken to the reheater where Its temperature...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
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