Required information An air-standard Diesel cycle has a compression ratio of 18.2. Air is at 120°F and 14.7 psia at the beginning of the compression process and at 3250 R at the end of the heat addition process. Account for the variation of specific heats with temperature. Use data from tables. Determine the heat rejection per unit mass. (You must provide an answer before moving on to the next part.) The heat rejection per unit mass is 173.693 Btu/lbm.

Required information An air-standard Diesel cycle has a compression ratio of 18.2. Air is at 120°F and 14.7 psia at the beginning of the compression process and at 3250 R at the end of the heat addition process. Account for the variation of specific heats with temperature. Use data from tables. Determine the heat rejection per unit mass. (You must provide an answer before moving on to the next part.) The heat rejection per unit mass is 173.693 Btu/lbm.

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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ces ! Required information A four-cylinder, four-stroke, spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a total displacement volume of 1.8 L. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is 1.1 kJ per cycle per cylinder. The gas constant of air is R = 0.287 kJ/kg-K and use constant specific heats with cv=0.821 kJ/kg-K, cp = 1.108 kJ/kg-K, and k= 1.35. Determine the maximum temperature and pressure that occur during the cycle. (You must provide an answer before moving on to the next part.) The maximum temperature during the cycle is The maximum pressure during the cycle is K. kPa.
Required information 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. Account for the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg-K. Determine the thermal efficiency. (You must provide an answer before moving on to the next part.) The thermal efficiency is %
! Required information Consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200 K. Use variable specific heats. Determine the back work ratio and the thermal efficiency of the cycle, assuming a regenerator with 79 percent effectiveness is used. The back work ratio is The thermal efficiency is [ %. 1%.
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
1. What is the specific enthalpy at the outlet of the turbine and compressor in KJ/Kg 2.what is the power output per unit mass flow rate of air of the turbine . 3.what is the rate of heat input per unit mass flow rate of the air during the heat addition process
the compression ratio of an ideal Otto cycle is 8. Pressure of air at the beginning of the isentropic compression process 95 kPa, Temperature 27 °C and constant volume input to the cycle is 750 kJ / kg. Consider that the specific constant is taking; which of the following are the temperature and pressure values at the end of the heat input into the cycle? (Cp=1.005 kJ/ups, C, =0.718 kJ / ups, R=0.287 kJ/ups, k=1.4) Please select one: a.4392 КРа 1534к O b.4392 Pa 1534 K с. 439.2 КРа 1734 К d.439.2 kPa 1534 K e.4392 kPa 1734 K
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An ideal Diesel engine uses air initially at 20°C and 90 kPa at the beginning of the compression process. If the compression ratio is 15 and the maximum temperature in the cycle is 2000ºC, determine the following: .net work (kJ) produced a. 812 b. 930 c. 1010 d. 1414 mean effective pressure (kPa) a. 812 b. 930 cut-off ratio a. 1.3 b. 2.8 c. 1010 d. 1414 c. 2.6 d. 5.7
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