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ud tthiperature tor all the state points identified in the cycle and hence determine the net heat rate of the cycle and the back work ratio. Briefly comment on the results. (10 marks) O 2014 DIT...
Calculate without constant specific heat (Cp). An air-standard dual cycle has a compression ratio of 14...
Calculate without constant specific heat (Cp). An air-standard dual cycle has a compression ratio of 14 and cut-off ratio of 1.2. The pressure ratio during constant volume heat addition is 1.5. Determine the: (A) Thermal efficiency (B) Amount of heat added (C) Maximum gas pressure and temperature when the cycle is operated at 80kPA and 20°C at the beginning of the compression.
(12 points) An ideal Otto cycle operates with a compression ratio of 10. At the beginning...
(12 points) An ideal Otto cycle operates with a compression ratio of 10. At the beginning of the compression process, the air is at 101 kPa and 27°C. During the constant volume heat addition process, 790 kJ/kg of heat is transferred to the air. Accounting for variable specific heats with temperature, determine: the maximum temperature during the cycle 1266.862 °C the maximum pressure during the cycle 6239.424 kPa the specific net work output 475.495481 kJ/kg the mean effective pressure (MEP)...
An air-starndard dual cycle has a compression ratio of 15 and a cutoff ratio of 1.15....
An air-starndard dual cycle has a compression ratio of 15 and a cutoff ratio of 1.15. At the beginning of compresso, -95 kPa and T- 300 K. The pressure increases by a factor of 2.2 during the constant volurne heat addition process. If the mass of air is 0.04 kq (a) the heat addition at constant volume,in ki. kl (b) the heat additiorn at constant pressure,in k (c) the net work cf the cycle, in k. kl (d) the heat...
Q6. (a) Using appropriate diagrams to support your answer: (i) Briefly describe the Otto cycle [3...
Q6. (a) Using appropriate diagrams to support your answer: (i) Briefly describe the Otto cycle [3 marks] (ii) Briefly describe the actual spark ignition engine cycle [3 marks] (iii) Discuss the differences between i and ii above. [4 marks] (b) 1 kg of air is taken through constant volume cycle. At the commencement of the adiabatic compression, the pressure and temperature are 90 kN/m² and 20°C, respectively. The adiabatic compression has a volume ratio of 7.5:1. The maximum pressure of...
Q1. An ideal dual cycle engine works with a stroke volume of 10 litres of air...
Q1. An ideal dual cycle engine works with a stroke volume of 10 litres of air with a compression ratio of 16. The pressure and temperature of air before isentropic compression is 1 bar and 300 K respectively. If the heat is added at a constant pressure of 70 bar and 5% of the stroke, determine: (10 M) i. ii. Pressure ratio Cut-off ratio iii. iv. V. vi. vii. viii. Mass of air contained in the cylinder Heat added per...
Use variable specific heats. An air-standard dual cycle has a compression ratio of 14 and cut-off...
Use variable specific heats. An air-standard dual cycle has a compression ratio of 14 and cut-off ratio of 1.2. The pressure ratio during constant volume heat addition (process 2-X) is 1.5. Determine the: (A) Thermal efficiency (B) Amount of heat added (C) Maximum gas pressure and temperature when the cycle is operated at 80kPA and 20°C at the beginning of the compression. Use variable specific heats.
Diesel Cycle a. The pressure and temperature at each state in this cycle. b. The compression ratio. c. The cutoff ratio. d. The thermal efficiency. e. The MEP (mean effective pressure.) Consider an a...
Diesel Cycle
a. The pressure and temperature at each state in this cycle.
b. The compression ratio.
c. The cutoff ratio.
d. The thermal efficiency.
e. The MEP (mean effective pressure.)
Consider an air-standard Diesel cycle (this means use variable specific heats). The inlet state to the compression process is at 95 kPa and 300 K. At the end of the heat addition process, the temperature is 2150 K and the pressure is 7200 kPa. Accounting for the variation of...
Problem 9.025 SI An air-standard dual cycle has a compression ratio of 8.6 and displacement of...
Problem 9.025 SI An air-standard dual cycle has a compression ratio of 8.6 and displacement of Vo = 2.2 L. At the beginning of compression, P1 = 95 kPa, and T1 = 290 K. The heat addition is 4.25 kJ, with one quarter added at constant volume and the rest added at constant pressure. Determine: c) each of the unknown temperatures at the various states, in K. the net work of the cycle, in kJ. the power developed at 3000...
An air-standard dual cycle has a compression ratio of 9.1 and displacement of Vd= 2.2 L....
An air-standard dual cycle has a compression ratio of 9.1 and displacement of Vd= 2.2 L. At the beginning of compression, p1 = 95 kPa, and T1 = 290 K. The heat addition is 4.75 kJ, with one quarter added at constant volume and the rest added at constant pressure. Determine: a) each of the unknown temperatures at the various states, in K. b) the net work of the cycle, in kJ. c) the power developed at 3000 cycles per...
4. (20 points): In a constant-volume the start. The temperature of air at the beginning of the compre temperature attained in the cycle is 2100°C. Take kar-1.4 and Rar = 0.287 kJ/kg K. Determine. a)...
4. (20 points): In a constant-volume the start. The temperature of air at the beginning of the compre temperature attained in the cycle is 2100°C. Take kar-1.4 and Rar = 0.287 kJ/kg K. Determine. a) The compression ratio b) The thermal efficiency of the cycle c) The work done d) The mean effective pressure (MEP) if Pi = 100 kPa Otto cycle the pressure at the end of compression is 12 times thatt ssion is 40°C. The maximum
4. (20...
(12 points) An ideal Otto cycle operates with a compression ratio of 10. At the beginning of the compression process, the air is at 101 kPa and 27°C. During the constant volume heat addition process, 790 kJ/kg of heat is transferred to the air. Accounting for variable specific heats with temperature, determine: the maximum temperature during the cycle 1266.862 °C the maximum pressure during the cycle 6239.424 kPa the specific net work output 475.495481 kJ/kg the mean effective pressure (MEP)...
An air-starndard dual cycle has a compression ratio of 15 and a cutoff ratio of 1.15. At the beginning of compresso, -95 kPa and T- 300 K. The pressure increases by a factor of 2.2 during the constant volurne heat addition process. If the mass of air is 0.04 kq (a) the heat addition at constant volume,in ki. kl (b) the heat additiorn at constant pressure,in k (c) the net work cf the cycle, in k. kl (d) the heat...
Q6. (a) Using appropriate diagrams to support your answer: (i) Briefly describe the Otto cycle [3 marks] (ii) Briefly describe the actual spark ignition engine cycle [3 marks] (iii) Discuss the differences between i and ii above. [4 marks] (b) 1 kg of air is taken through constant volume cycle. At the commencement of the adiabatic compression, the pressure and temperature are 90 kN/m² and 20°C, respectively. The adiabatic compression has a volume ratio of 7.5:1. The maximum pressure of...
Q1. An ideal dual cycle engine works with a stroke volume of 10 litres of air with a compression ratio of 16. The pressure and temperature of air before isentropic compression is 1 bar and 300 K respectively. If the heat is added at a constant pressure of 70 bar and 5% of the stroke, determine: (10 M) i. ii. Pressure ratio Cut-off ratio iii. iv. V. vi. vii. viii. Mass of air contained in the cylinder Heat added per...
Diesel Cycle
a. The pressure and temperature at each state in this cycle.
b. The compression ratio.
c. The cutoff ratio.
d. The thermal efficiency.
e. The MEP (mean effective pressure.)
Consider an air-standard Diesel cycle (this means use variable specific heats). The inlet state to the compression process is at 95 kPa and 300 K. At the end of the heat addition process, the temperature is 2150 K and the pressure is 7200 kPa. Accounting for the variation of...
Problem 9.025 SI An air-standard dual cycle has a compression ratio of 8.6 and displacement of Vo = 2.2 L. At the beginning of compression, P1 = 95 kPa, and T1 = 290 K. The heat addition is 4.25 kJ, with one quarter added at constant volume and the rest added at constant pressure. Determine: c) each of the unknown temperatures at the various states, in K. the net work of the cycle, in kJ. the power developed at 3000...
4. (20 points): In a constant-volume the start. The temperature of air at the beginning of the compre temperature attained in the cycle is 2100°C. Take kar-1.4 and Rar = 0.287 kJ/kg K. Determine. a) The compression ratio b) The thermal efficiency of the cycle c) The work done d) The mean effective pressure (MEP) if Pi = 100 kPa Otto cycle the pressure at the end of compression is 12 times thatt ssion is 40°C. The maximum
4. (20...
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