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QUESTION 5 A Stirling engine converts 500 kJ of heat into 200 KJ of work. How...
Question 2 (20%) A heat engine takes 425 kJ of heat from a reservoir at 1000...
Question 2 (20%) A heat engine takes 425 kJ of heat from a reservoir at 1000 °C and discharges its excess heat to a reservoir at 400 °C. This heat engine produces 200 kJ net work. Explain mathematically if this engine is reversible or irreversible and if it is possible to have such a heat engine. Describe the physical reasoning behind your answer.
1. (15 points) Consider a Stirling Engine with the following parameters Working gas Isothermal co...
1. (15 points) Consider a Stirling Engine with the following parameters Working gas Isothermal compression temperature T Isothermal expansion temperature TE Vi Air 80°C 400 °C 650 cm 550 cm3 1000 kPa P1 Operating frequenc Using properties of air at 500K, determine (a) the mass of working gas used in the cycle, (b) the net work done per cycle (in kJ), (c) the net power output produced (in kW), (d) the external heat delivered to the expansion space QE during...
5. A certain heat engine operates between 1000 K and 500 K a) What is the...
5. A certain heat engine operates between 1000 K and 500 K a) What is the maximum efficiency of the engine? (ANS: 0.5) b) Calculate the maximum work that can be done per kJ of heat supplied by the hot source. (ANS: 0.5 kJ) c) How much heat is discharged into the cold sink in a reversible process for each kJ supplied by the hot source? (ANS: 0.25)
QUESTION 9 A heat engine takes in 55 kJ/s heat at 1000°Сand releases its exhaust heat...
QUESTION 9 A heat engine takes in 55 kJ/s heat at 1000°Сand releases its exhaust heat at 40 kJ/s. If the environment has a temperature of 25°C, what is the 2nd law efficiency of this system? (in %) 35.6 50.2 60,9 69.1 65.3
Problem 1 The work output (1000 kJ) and thermal efficiency of a Carnot heat engine (50%)...
Problem 1 The work output (1000 kJ) and thermal efficiency of a Carnot heat engine (50%) are given. The heat supplied to the heat engine, the heat rejected and the temperature of heat sink are to be determined 1200 C Qn 5096 HE1000 kJ sink
A heat engine operates between - 120°C and 450°C. It produces 10 kJ of work with...
A heat engine operates between - 120°C and 450°C. It produces 10 kJ of work with a heat input of 18 kJ. Find the engine's efficiency and determine if it is reversible, irreversible, or impossible.
Solve below questions and choose the correct answer A cyclic heat engine does 50kJ of work...
Solve below questions and choose the correct answer A cyclic heat engine does 50kJ of work per cycle. If efficiency of engine is 75%, the heat rejected per cycle will be 66.6 kJ 16.6 kJ 60.6 kJ 200 kJ Consider air in a cylinder volume of 0.2 L at 7 MPa, 1800K. It now expands in a reversible polytropic process with exponent, n = 1.5, through a volume ratio of 8:1. Calculate the work for the process O 1.61 kJ...
Question #2 10 marks) A heat engine that uses water as the working fluid is being...
Question #2 10 marks) A heat engine that uses water as the working fluid is being used to produce power in a certain location. The condenser of the heat engine is being cooled by drawing 200 kg/s of water from a nearby lake at 25°C and discharging it at 50°C. The thermal efficiency of the heat engine is 40%. Furnace Boiler Condenser 25°C | water from lake 200 kg/s V 50°C water returned to the lake Calculate: i) The amount...
A heat engine has an efficiency of 0.25 when it receives 250 J of heat. The...
A heat engine has an efficiency of 0.25 when it receives 250 J of heat. The amount of heat exhausted by the engine is A 190 B. 250 COJ D. 63) E None of the above. B During an isothermal process involving an ideal gas, 150 J of heat is removed from the system. The change in the internal energy of the gas is A 150J BOJ C 150J D. Unknown; not enough information is given to answer the question....
a. Suppose 1500 Joules of work is done on a system, and 300 Joules of heat...
a. Suppose 1500 Joules of work is done on a system, and 300 Joules of heat are delivered to the system. What happens to the internal energy of that system? b. What is the efficiency of an engine that takes in heat at 200oC, and rejects heat to the environment at 25oC? Big Hint: REMEMBER to work in Kelvin. c. Bernoulli’s equation shows that pressure in a fluid will tend to drop as velocity increases. Assuming a wind speed...
Question 2 (20%) A heat engine takes 425 kJ of heat from a reservoir at 1000 °C and discharges its excess heat to a reservoir at 400 °C. This heat engine produces 200 kJ net work. Explain mathematically if this engine is reversible or irreversible and if it is possible to have such a heat engine. Describe the physical reasoning behind your answer.
1. (15 points) Consider a Stirling Engine with the following parameters Working gas Isothermal compression temperature T Isothermal expansion temperature TE Vi Air 80°C 400 °C 650 cm 550 cm3 1000 kPa P1 Operating frequenc Using properties of air at 500K, determine (a) the mass of working gas used in the cycle, (b) the net work done per cycle (in kJ), (c) the net power output produced (in kW), (d) the external heat delivered to the expansion space QE during...
5. A certain heat engine operates between 1000 K and 500 K a) What is the maximum efficiency of the engine? (ANS: 0.5) b) Calculate the maximum work that can be done per kJ of heat supplied by the hot source. (ANS: 0.5 kJ) c) How much heat is discharged into the cold sink in a reversible process for each kJ supplied by the hot source? (ANS: 0.25)
QUESTION 9 A heat engine takes in 55 kJ/s heat at 1000°Сand releases its exhaust heat at 40 kJ/s. If the environment has a temperature of 25°C, what is the 2nd law efficiency of this system? (in %) 35.6 50.2 60,9 69.1 65.3
Problem 1 The work output (1000 kJ) and thermal efficiency of a Carnot heat engine (50%) are given. The heat supplied to the heat engine, the heat rejected and the temperature of heat sink are to be determined 1200 C Qn 5096 HE1000 kJ sink
A heat engine operates between - 120°C and 450°C. It produces 10 kJ of work with a heat input of 18 kJ. Find the engine's efficiency and determine if it is reversible, irreversible, or impossible.
Solve below questions and choose the correct answer A cyclic heat engine does 50kJ of work per cycle. If efficiency of engine is 75%, the heat rejected per cycle will be 66.6 kJ 16.6 kJ 60.6 kJ 200 kJ Consider air in a cylinder volume of 0.2 L at 7 MPa, 1800K. It now expands in a reversible polytropic process with exponent, n = 1.5, through a volume ratio of 8:1. Calculate the work for the process O 1.61 kJ...
Question #2 10 marks) A heat engine that uses water as the working fluid is being used to produce power in a certain location. The condenser of the heat engine is being cooled by drawing 200 kg/s of water from a nearby lake at 25°C and discharging it at 50°C. The thermal efficiency of the heat engine is 40%. Furnace Boiler Condenser 25°C | water from lake 200 kg/s V 50°C water returned to the lake Calculate: i) The amount...
A heat engine has an efficiency of 0.25 when it receives 250 J of heat. The amount of heat exhausted by the engine is A 190 B. 250 COJ D. 63) E None of the above. B During an isothermal process involving an ideal gas, 150 J of heat is removed from the system. The change in the internal energy of the gas is A 150J BOJ C 150J D. Unknown; not enough information is given to answer the question....
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