calculate the air standard efficiency of an engine working on constant volume cycle (Otto) if the...
calculate the air standard efficiency of an engine working on constant volume cycle (Otto) if the pressure at the beginning and the end of the compression are 103.5 kpa and 827.5kpa, respectively. take y=1.4
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calculate the air standard efficiency of an engine working on
constant volume cycle (Otto) if the...
Q1 Otto Cycle Bookwork Question An air standard Otto cycle:- 1. Draws air from the environment...
Q1 Otto Cycle Bookwork Question An air standard Otto cycle:- 1. Draws air from the environment at 100 kPa and 5°C. 2. The cycle has a compression ratio of 9.2: 1. 3. Heat (880 kJ/kg) is added to the compressed gases at constant volume. 4. The working fluid is air, a perfect gas with ratio of specific heats y = 1.4 and gas constant R = 287 J/kgk. Follow the instructions below: a) Describe each of the four processes from...
Consider a cold air standard Otto cycle for a 4-stroke engine with four cylinders. The compression...
Consider a cold air standard Otto cycle for a 4-stroke engine with four cylinders. The compression ratio is 9. At the beginning of the compression the air in each cylinder is at 95 kPa, 5 C and occupies a volume of 555 cm^3. During the heat addition process the pressure triples. Determine the efficiency of the cycle and the net power output (per kg of air). If the engine is running at 2800 RPM determine the power output in horsepower....
5) Otto Cycle In this problem, you will analyze the performance of an air-standard Otto cycle for...
5) Otto Cycle In this problem, you will analyze the performance of an air-standard Otto cycle for two cases: 1) variable specific heats of air and 2) constant specific heats of air evaluated at 300 K. The following information is given for the cycle: .The pressure and temperature, respectively, are 100 kPa and 300 K at the beginning of compressionn The compression ratio is 9 . The heat addition per unit mass of air is 1350 kJ/kg For each case,...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine is at 300K and 95kPa (State 1). The air is compressed in the engine to an unknown pressure. Heat is then added during combustion at an amount of 1100 kJ/kg. At the end of the heat addition process, the temperature reaches 2200K. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio of this engine, (c)...
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...
Problem (3) The compression ratio of an air-standard Otto cycle is 8. At the beginning of...
Problem (3) The compression ratio of an air-standard Otto cycle is 8. At the beginning of compression process, the air is at 100 KPa, and 17 °C. 800 kJ/kg of heat is transferred to the air during the constant volume heat addition process. Determine: (a) The highest temperature in the cycle. (b) The highest pressure in the cycle. (c) The net work. (d) The thermal efficiency of the cycle.
3.5 An engine working on ideal Otto cycle, the ratio of temperature at the beginning of...
3.5 An engine working on ideal Otto cycle, the ratio of temperature at the beginning of compression is 300 K. If the ideal air-standard efficiency 0.5, calculate the compression ratio of the engine. If the peak tem- perature of the cycle is 1150 K, calculate the temperature when the piston is at BDC during expansion stroke. Ans: (i) 5.66 (ii) 575 K
Temperature and pressure at the beginning of the compression process of an air-standard Otto cycle are...
Temperature and pressure at the beginning of the compression process of an air-standard Otto cycle are 295 K and 100 kPa, respectively. The compression ratio is 10 and the maximum temperature during the cycle is 2200 K. Draw P-v and T-s diagrams of the cycle and determine: a) The net work in kJ/kg. b) The thermal efficiency. c) The mean effective pressure, in kPa. Assume R = 287 J/kg.K for air.
An ideal Otto cycle with air as the working fluid has a compression ratio of 7....
An ideal Otto cycle with air as the working fluid has a compression ratio of 7. At the beginning of the compression process, air is at 90 kPa and 27°C, and volume of the cylinder v1 = 0.004 m3. The maximum cycle temperature is 1127°C. Taking into account constant specific heats at room temperature, determine, a) the heat rejection (2) b) the net work output (2) c) the thermal efficiency, and (2) d) the mean effective pressure for the cycle...
A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an eng...
A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM. The compression ratio is Te10.4:1, and condi- tions in the cylinders at the start of compression are 65°C and 120 kPa. Crevice volume is equal to 2.8% of clearance volume and has pressure equal to cylinder pressure and temperature equal to 185°C Calculate: (a) Total engine crevice volume. [cm31 (b) Percent of fuel that is trapped in the crevice...
Q1 Otto Cycle Bookwork Question An air standard Otto cycle:- 1. Draws air from the environment at 100 kPa and 5°C. 2. The cycle has a compression ratio of 9.2: 1. 3. Heat (880 kJ/kg) is added to the compressed gases at constant volume. 4. The working fluid is air, a perfect gas with ratio of specific heats y = 1.4 and gas constant R = 287 J/kgk. Follow the instructions below: a) Describe each of the four processes from...
5) Otto Cycle In this problem, you will analyze the performance of an air-standard Otto cycle for two cases: 1) variable specific heats of air and 2) constant specific heats of air evaluated at 300 K. The following information is given for the cycle: .The pressure and temperature, respectively, are 100 kPa and 300 K at the beginning of compressionn The compression ratio is 9 . The heat addition per unit mass of air is 1350 kJ/kg For each case,...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine is at 300K and 95kPa (State 1). The air is compressed in the engine to an unknown pressure. Heat is then added during combustion at an amount of 1100 kJ/kg. At the end of the heat addition process, the temperature reaches 2200K. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio of this engine, (c)...
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...
Problem (3) The compression ratio of an air-standard Otto cycle is 8. At the beginning of compression process, the air is at 100 KPa, and 17 °C. 800 kJ/kg of heat is transferred to the air during the constant volume heat addition process. Determine: (a) The highest temperature in the cycle. (b) The highest pressure in the cycle. (c) The net work. (d) The thermal efficiency of the cycle.
3.5 An engine working on ideal Otto cycle, the ratio of temperature at the beginning of compression is 300 K. If the ideal air-standard efficiency 0.5, calculate the compression ratio of the engine. If the peak tem- perature of the cycle is 1150 K, calculate the temperature when the piston is at BDC during expansion stroke. Ans: (i) 5.66 (ii) 575 K
Temperature and pressure at the beginning of the compression process of an air-standard Otto cycle are 295 K and 100 kPa, respectively. The compression ratio is 10 and the maximum temperature during the cycle is 2200 K. Draw P-v and T-s diagrams of the cycle and determine: a) The net work in kJ/kg. b) The thermal efficiency. c) The mean effective pressure, in kPa. Assume R = 287 J/kg.K for air.
A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM. The compression ratio is Te10.4:1, and condi- tions in the cylinders at the start of compression are 65°C and 120 kPa. Crevice volume is equal to 2.8% of clearance volume and has pressure equal to cylinder pressure and temperature equal to 185°C Calculate: (a) Total engine crevice volume. [cm31 (b) Percent of fuel that is trapped in the crevice...
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