An engine working on the Otto cycle has 1 kg of air entering at 315 K and a volume of 0.6 m³ at the beginning of compression cycle. At the end of compression cycle, the volume is 0.05 m³. If the maximum temperature of the cycle is 1,163 K, compute the Mean Effective Pressure (in kPa). Let k = 1.4, = 0.718 kJ/kg-K. Cv=0.718 kj/kg-k

An engine working on the Otto cycle has 1 kg of air entering at 315 K and a volume of 0.6 m³ at the beginning of compression cycle. At the end of compression cycle, the volume is 0.05 m³. If the maximum temperature of the cycle is 1,163 K, compute the Mean Effective Pressure (in kPa). Let k = 1.4, = 0.718 kJ/kg-K. Cv=0.718 kj/kg-k

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Intake air into an Otto engine is at 14.7 psia and 530 deg R with an Air- Fuel Ratio of 15. The heating value of the fuel is 18,900 BTU/lb fuel. The corresponding ideal cycle efficiency is 50%. The actual engine has a volumetric efficiency of 75% and a brake engine efficiency of 55%. Use an overall value of k = 1.33. Compute the brake mean effective pressure and the compression ratio of the engine. ANS: 105.5 psi, 8.18
The max temperature of an Otto cycle working under air standard conditions is 8000 degrees Celsius. Determine the compression ratio of the cycle if the heat injected in each cycle is 350kJ/kg.
3. 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 95 kPa and 27 °C. Accounting for the variation of specific heats with temperature, determine (a) the temperature after the heat addition process, (b) the thermal efficiency. and (c) the mean effective pressure. T, K h, kJ/kg Pr u, kJ/kg 300 300.19 1.3860 214.07 621.2 57.60 624.95 41.85 840 866.08 860 888.27 63.09 641.40 39.12 880 910.56 68.98 657.95 36.61 900 932.93 75.29 674.58 34.31 1700 1880.1 1025 1392.7 4.761 1750 1941.6 1161 1439.8 4.328 sº, kJ/(kg-K) 1.70203 2.77170 2.79783 2.82344 2.84856 3.5979 3.6336
An otto cycle engine has a compression ratio of 8:1. At the beginning of the compression stroke the air is at 103.5 kPa and 300K. If the heat added is 920 kJ/kg. Calculate the maximum pressure in the cycle (kPa).
An Otto cycle operating in an air standard conditions has a peak temperature of 800degree C. If the heat added in each cycle is equal to 350kJ/kg, determine the compression ratio of the cycle.
An ideal Diesel cycle has the air inlet temperature and pressure of 25 °C and 92 kPa respectively. The compression ratio is 18:1 while the maximum cycle temperature is 1,127 °C. Take Specific heat at constant pressure and constant volume for air as 1.008 kJ/kg K and 0.713 kJ/kg K respectively. Calculate the absolute temperature after the isentropic compression process to one decimal place and include the correct unit (absolute temperature). Add units
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 99 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. Determine the mean effective pressure. The mean effective pressure is 569.685 kPa.
Temperature after the heat addition process = K Thermal efficiency =% Mean effective pressure = kpa
A Brayton cycle with an air-powered regenerator has a pressure ratio of 8. The lowest and highest temperatures of the cycle are 310 K and 1150 K. The adiabatic efficiencies of the compressor and turbine are 75% and 82%, respectively, and the efficiency of the regenerator is 65%. Show the cycle in the T-s diagram. Consider the variation of the specific heats with temperature. a) The temperature of the air at the turbine exit, b) Net work of the cycle, c) Calculate the thermal efficiency of the cycle.
A refrigerant 22 refrigeration system carries a load of 82 kW at an evaporator pressure of 354 kPa and a condenser pressure of 1460 kPa. The liquid refrigerant is subcooled by 4 degrees before entering the expansion valve and the vapor is superheated by 5 degrees before entering the compressor. The compressor operates at 28 r/s. The stroke-to-bore ratio of the twin-cylinder compressor is 1.20 and the actual volumetric efficiency is 82 per cent. Determine (a) mass flow rate of refrigerant, (b) mass flow rate of cooling water in the condenser for a 7-degree change in temperature, and (c) the bore and stroke. Ans. (a) 0.5025 kg/s, (b) 3.43 kg/s, (c) 9.2 x 11 cm