Homework Answers
a) 2nd law efficiency is defined as the it is a measure of how much the theoretical maximum carnot you achieve, in simple word it is the comparison between system thermal efficiency to maximum possible efficiency.it is the ratio of output energy if system to input energy.
2nd law efficiency is always will be in between of carnot and 1st law of efficiency.
1st law is purely related with the specific technology applied.and 2nd law is employed with actual technology and technology that theoretical be best for particular task.
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a) In thermodynamics, what is the second law efficiency? How does it differ from the first...
Chose the correct answer(s) from the multiple choice lists below 1. Exergy of a system is a) b) always increasing e) guided by the first and second laws of thermodynamics for reversible proce...
Chose the correct answer(s) from the multiple choice lists below 1. Exergy of a system is a) b) always increasing e) guided by the first and second laws of thermodynamics for reversible processes only Un d) limited by the second law of thermodynamics for all processes. processes, it is destroyed partly or completely). e) equal to the Gibs free energy of the system. 211two electrodes, one made of u (E.-3.06 V) and another made of Cu ΟΕ.+034V placed in an...
Thermodynamics 2: STARTING FROM QS 2) 1) In an ideal Brayton cycle air enters the compressor...
Thermodynamics 2: STARTING FROM QS 2) 1) In an ideal Brayton cycle air enters the compressor at T = 300K and P = 1 bar with a volumetric flow rate = 20 m3/s. Air enters the turbine at P = 10 bar and T = 1800K. Find: a) The thermal efficiency b) The backwork ratio c) The net power generation in MW 2) For the same states above consider a cycle where the isentropic efficiency of the compressor and turbine...
Mechanical Engineering Thermodynamics, ME 200 5- Workshop - Open system first law with Air as an...
Mechanical Engineering Thermodynamics, ME 200 5- Workshop - Open system first law with Air as an ideal gas Pre-work (1) Write the ideal gas law? (2) What is the value of the universal gas constant in english units (both units: 2 .and... .) (3) What is the ideal gas constant for air (both sets of units)? (4) Write conservation of energy (first law) for an open system (control volume): (5) Write down the options of how to find the value...
T =1050 K P.950 kPa m-5k/s Q=12 kW Question 1 150 Points) Combustion gases that we...
T =1050 K P.950 kPa m-5k/s Q=12 kW Question 1 150 Points) Combustion gases that we can assume to be air enter a gas turbine at T-1050 K and P-950 kPa at a mass flow rate of 5 kg/s and leave the turbine at T 850 K and P-500 kPa. The heat lost to the surroundings at 25 °C is 12 kW. The flow through the turbine is steady state steady flow process. The air can be assumed to be...
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-...
Problem 1 (Marks 3) Smithfield power station in NSW, Australia operates on 4 gas turbines. Each of the gas turbine unit...
Problem 1 (Marks 3) Smithfield power station in NSW, Australia operates on 4 gas turbines. Each of the gas turbine unit operates on the regenerative Brayton Cycle between the pressure limits of 100 kPa and 700 kPa. Air enters the compressor at 30°C at a rate of 12.6 kg/s and leaves at 260°C. It is then heated in a regenerator to 400°C by hot combustion gases leaving the turbine. Diesel fuel with heating value of 42,000 kJ/kg is burned in...
Control volume is given by the following The exergy rese batence is given for der /...
Control volume is given by the following The exergy rese batence is given for der / 1 1 1 1 1 2 [her to the smeri şincelets Describe the following (1-T/T;) .. (ver-p, dVer de . 17 marks b) Steam is throttled from 7 MPa and 500 C to a pressure of 1 MPa. Determine the decrease in exergy of the steam during this process. Assume the surroundings to be at 25°C (6 marks) c) A freezer is maintained at...
Can someone please help out with these questions? Thanks. 1. State the First Law of Thermodynamics...
Can
someone please help out with these questions? Thanks.
1. State the First Law of Thermodynamics 2. What are the sign conventions for the heat O and the work W . How is the First Law related to conservation of energy? 4. Define internal energy 5. Does internal energy depend on path, in other words how a system got to the state its in? 6. How does the First Law apply to weight gain? . What is an irreversible process?...
Chemical Unive ChE Engineering Department 205: Given by Dr. M. K. Hadi-kali Time allowed: 2h This...
Chemical Unive ChE Engineering Department 205: Given by Dr. M. K. Hadi-kali Time allowed: 2h This final esam is closed book. Answer problems showint all the necessary steps) 2.One kg of air ul.-20 giaci -21 J mer Krois adia atically and reversibly fro bars and 120 C to 20 bars. calculate the final temperature and the work on joule) required process. Assume that air is an ideal gas. l 3. Calculate the molar volume and the compressibility factor of ethylene...
the temperature is 600K and the pressure is 500 bar. ChE 220 Thermodynamics I Take Home Quiz 2 We want to determine the deviations from the ideal gas law for nitrogen using the virial equation. W...
the temperature is 600K and the pressure is 500 bar.
ChE 220 Thermodynamics I Take Home Quiz 2 We want to determine the deviations from the ideal gas law for nitrogen using the virial equation. We are given the following expermimetal data for the second vrial equation as: 88.7 B 185.4 141.8 exp T (000K B: 21.008 where B is in units of cm3/mol and T is in Kelvin. Use your conditions in the table below for your to determine...
Chose the correct answer(s) from the multiple choice lists below 1. Exergy of a system is a) b) always increasing e) guided by the first and second laws of thermodynamics for reversible processes only Un d) limited by the second law of thermodynamics for all processes. processes, it is destroyed partly or completely). e) equal to the Gibs free energy of the system. 211two electrodes, one made of u (E.-3.06 V) and another made of Cu ΟΕ.+034V placed in an...
Mechanical Engineering Thermodynamics, ME 200 5- Workshop - Open system first law with Air as an ideal gas Pre-work (1) Write the ideal gas law? (2) What is the value of the universal gas constant in english units (both units: 2 .and... .) (3) What is the ideal gas constant for air (both sets of units)? (4) Write conservation of energy (first law) for an open system (control volume): (5) Write down the options of how to find the value...
T =1050 K P.950 kPa m-5k/s Q=12 kW Question 1 150 Points) Combustion gases that we can assume to be air enter a gas turbine at T-1050 K and P-950 kPa at a mass flow rate of 5 kg/s and leave the turbine at T 850 K and P-500 kPa. The heat lost to the surroundings at 25 °C is 12 kW. The flow through the turbine is steady state steady flow process. The air can be assumed to be...
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-...
Problem 1 (Marks 3) Smithfield power station in NSW, Australia operates on 4 gas turbines. Each of the gas turbine unit operates on the regenerative Brayton Cycle between the pressure limits of 100 kPa and 700 kPa. Air enters the compressor at 30°C at a rate of 12.6 kg/s and leaves at 260°C. It is then heated in a regenerator to 400°C by hot combustion gases leaving the turbine. Diesel fuel with heating value of 42,000 kJ/kg is burned in...
Control volume is given by the following The exergy rese batence is given for der / 1 1 1 1 1 2 [her to the smeri şincelets Describe the following (1-T/T;) .. (ver-p, dVer de . 17 marks b) Steam is throttled from 7 MPa and 500 C to a pressure of 1 MPa. Determine the decrease in exergy of the steam during this process. Assume the surroundings to be at 25°C (6 marks) c) A freezer is maintained at...
Can
someone please help out with these questions? Thanks.
1. State the First Law of Thermodynamics 2. What are the sign conventions for the heat O and the work W . How is the First Law related to conservation of energy? 4. Define internal energy 5. Does internal energy depend on path, in other words how a system got to the state its in? 6. How does the First Law apply to weight gain? . What is an irreversible process?...
Chemical Unive ChE Engineering Department 205: Given by Dr. M. K. Hadi-kali Time allowed: 2h This final esam is closed book. Answer problems showint all the necessary steps) 2.One kg of air ul.-20 giaci -21 J mer Krois adia atically and reversibly fro bars and 120 C to 20 bars. calculate the final temperature and the work on joule) required process. Assume that air is an ideal gas. l 3. Calculate the molar volume and the compressibility factor of ethylene...
the temperature is 600K and the pressure is 500 bar.
ChE 220 Thermodynamics I Take Home Quiz 2 We want to determine the deviations from the ideal gas law for nitrogen using the virial equation. We are given the following expermimetal data for the second vrial equation as: 88.7 B 185.4 141.8 exp T (000K B: 21.008 where B is in units of cm3/mol and T is in Kelvin. Use your conditions in the table below for your to determine...
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