16-15M An air-standard Otto cycle operates with a compression ratio of 8.55. At the beginning of compression the air is at 0.98 bar and 32°C, and during the heat-addition process the pressure is air is a tripled.
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- A four-cylinder, four-stroke engine has a displacement volume of 300 cc (cubic centimeter) per cylinder. The compression ratio of the engine is 10 and operates at a speed of 3000 rev/min. The engine is required to develop an output of 40 kW at this speed. Calculate the cycle efficiency, the necessary rate of heat addition, the mean effective pressure, and the maximum temperature of the cycle. The inlet conditions are 1 .1bar and 30 deg.C, respectively. Analyze using the Otto cycle and Diesel cycle. Compare the results.A compression ratio of 8 is achieved by using an ideal air-standard Otto cycle engine. The working fluid has a pressure of 100 kPa and a temperature of 27°C at the start of the compression process, and the constant volume heat addition process supplies 800 kJ/kg of heat to the working fluid. What are the (a )the temperature, volume and pressure of the air at the end of each process (in K, m3 and kPa) (b) the net work output/cycle [kJ/kg], and (c) the thermal efficiency of this engine cycleAn air-standard Compression Ignition cycle has a compression ratio of 18.2. Air is at 3200°R at the end of the heat addition process. Neglecting the variation of specific heats with temperature, determine the following: a. Cut-off ratio b. Net output work of the cycle Heat rejection per unit mass, Btu/lb d. Thermal efficiency of the cycle(%). Compare this efficiency value if the cycle has to run on an air standard Carnot Cycle.
- A cycle that works with standard air complies with the Otto principle, this cycle has a compression ratio of 9, plus a maximum temperature of 1400 K and a minimum temperature of 250 K. If variable specific heats are taken into account with the change oftemperatures, calculate:1. The thermal efficiency of the cycle.2. Amount of heat transferred to the air3. The temperature at the completion of the isentropic expansion.4. Generate the P-v and T-s Charts with all the dataon the ideal dual-Combustion Q6) In an engine working cycle, the temperature and pressure at the beginning of Compression are 100°℃ and loo kpa respectively. The Gomperssion ratio is 10:1. If the maximum Pressure is limited to 7000 kPa and 1.675 kJ of heat is supplied Per kg of airs determine the temperature at salient (key) Points of the cycle and the air standard efficiency. of the engine. Assume CP=1.0035 kJ/kg.k, Cu= 0.71 65 kJ/kg. kAn air standard diesel cycle operates at a maximum temperature and pressure of 3000 K and 8500 kPa. The air’s condition before entering compression stroke is 100 kPa at 300 K. a. Draw the cycle’s P-V and T-S diagrams (use state points 1-2-3-4 in order).b. Identify all unknown temperatures (K) and pressures (kPa) at 4 state points.c. Determine the compression ratio and cut-off ratio of the engine.d. Calculate the cycle’s thermal efficiency.e. What is the cycle’s mean effective pressure (kPa)?
- Required information Problem 09.052 - Ideal Diesel Cycle with Variable Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 103 kPa and 27°C. Account for the variation of specific heats with temperature. The gas constant of air is R= 0.287 kJ/kg-K. Problem 09.052.b - Thermal Efficiency in Variable Heat Capacity Diesel Cycle Determine the thermal efficiency. (You must provide an answer before moving on to the next part.) The thermal efficiency is 59.38 %.An ideal Brayton cycle with regeneration has a pressure ratio of 8. Air enters the compressor at 300 K and the turbine at 1400 K. If the effectiveness of the regenerator is 100 %, determine: a- back work ratio,b- the net work output,c- the thermal efficiency of the cycle, andd- draw the p-v and T-s diagrams.Account for the variation of specific heats with temperature.An SI engine operates on an Otto cycle at 3800 RPM, with maximum cycle temperature andpressure of 3100 K and 7846 kPa. The engine has a compression ratio of 9.8:1, and immediately after combustion there is 0.000622 kg of exhaust gas in eachcylinder.During exhaustblowdown, the average mass flow rate through the single exhaust valve is 0.218 kg/sec. Atthe end of blowdown, cylinder pressure is reduced to exhaust pressure of 101 kPa.Calculate:(a) Temperature in cylinder at end of exhaust blowdown. [K](b) Mass of exhaust gas in cylinder at end of blowdown. [kg](c) Crank angle when exhaust valve opens. [° bBDC]
- An air-standard Spark Ignition cycle has a compression ratio of 10.2. Air is at 3000°R at the end of the heat addition process. Neglecting the variation of specific heats with temperature, determine the following:a. Net output work of the cycleb. Heat rejection per unit mass, Btu/lbc. Thermal efficiency of the cycle(%). Compare this efficiency value if the cycle has to run on an air standard Carnot Cycle.In a C.I. engine working on the dual combustion cycle the compression ratio is 12.5:1. Air at 101.3kPa and 35°C is compressed adiabatically. Fuel is then added until the pressure reaches 4000kPa, then at constant pressure to a temperature of 1425°C. After adiabatic expansion to the initial volume exhaust takes place. Calculate: (a). work done/kg air (b). thermal efficiencyA 4-litre 4-cylinder air-standard Otto cycle engine works on benzene fuel at an air-fuel ratio of 15.The compression ratio of the engine is 10. At the start of the compression stroke, conditions in the cylinders are 60°C and 100 KPa. the benzene low heating value is 41800 KJ/kg Calculate: 1. Temperature and pressure at each state of the cycle, Indicated thermal efficiency, Residual gas temperature after blow down and ambient temperature 2.plot the PV diagram of this cycle and If this engine is operating on the dual cycle, will the efficiency be larger or smaller than the diesel cycle?