3.) Consider a cold air-standard Otto cycle. Operating data at table below. The and R =...
A cold air-standard Otto cycle (k =1.4) has a compression ratio of 7.0. At the beginning of the compression process, P,=90 kPa, T,=27°C, and V,=0.004 m3. The maximum cycle temperature is 1127°C. For this cycle determine: (a) Sketch a P-V diagram for the cycle and label the data states (b) the net work output (kW) (c) the thermal efficiency Page 5 of 6
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...
1. Consider the air-standard Otto cycle with a compression ratio r = 12 and a minimum temperature and pressure of T=300K and P=1bar and a maximum temperature of 1200K. Find the thermal efficiency and compare to the cold air efficiency. 2. For the Otto cycle above calculate the thermal efficiency if the maximum temperature is now, 1400, 1600, and 1800 K. Comment on the trend. 3. For the Diesel cycle with a compression ratio of 18, a minimum temperature and...
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,...
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....
Required information An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27 and 720 kJ/kg of heat is transferred to air during the constant volume heat addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R=0.287 kJ/kg.K. Determine the network output (You must provide an answer before moving on to the next part.) The net work output...
(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 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...
An air standard Otto cycle at the initial condition of P,=1 bar, T,=290 °K, V = 400 cm². The maximum temperature of the engine is 2200°K and compression ratio is 8. The mass of air is assumed to be 4.8x104kg. Assume isentropic process exits in both compression and expansion strokes. (a) Sketch the P-V and T-S diagram of the cycle (5%), (b) determine the total heat addition to the gas in kj (20%). (c) Net cycle work output of the...
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temperature is 1116°C. Accounting for variable specific heats, determine: (a) the heat addition per cycle in kJ. Ans: 3.368 kJ (b) the net work per cycle in kJ. Ans: 1.907 kJ (c) the mean effective pressure in kPa. Ans: 460.6 kPa (d) the...