Problem # 2 Otto Cycle – Cold Air Standard Analysis An air-standard Otto cycle has a compression ratio of 8.5. At the beginning of compression, P, = 100 kPa and T, = 300 K. The heat addition per unit mass of the air is 1400 kJ/kg. Solve the problem on a cold air- standard basis with specific heats evaluated at 300 K. Determine the network, in kJ per kg of air. 805.2 kJ/kg] [b] the thermal efficiency of the cycle. 57.5%] [a] [n =

Problem # 2 Otto Cycle – Cold Air Standard Analysis An air-standard Otto cycle has a compression ratio of 8.5. At the beginning of compression, P, = 100 kPa and T, = 300 K. The heat addition per unit mass of the air is 1400 kJ/kg. Solve the problem on a cold air- standard basis with specific heats evaluated at 300 K. Determine the network, in kJ per kg of air. 805.2 kJ/kg] [b] the thermal efficiency of the cycle. 57.5%] [a] [n =

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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At the beginning of compression in an air-standard Diesel cycle, p1 = 96 kPa, V1 = 0.016 m3, and T1 = 290 K. The compression ratio is 15 and the maximum cycle temperature is 1290 K. Determine (a) the mass ofair, in kg. (b) the heat addition and heat rejection per cycle, each in kJ. (c) the net work, in kJ, and d) the thermal efficiency. (e) Solve the problem on a cold air-standard basis with constant specific heats.
At the beginning of the compression process of an air-standard Otto cycle, p1 = 100 kPa, T1 = 290 K, V1 = 400 cm3. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine the (a) thermal efficiency; and (b) mean effective pressure, in bar. (c) Solve on a cold air-standard basis with constant specific heats.
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 9.5 with p1 = 100 kPa, T1 = 340 K, and T3 = 4850.3 K, r = 15 and rc = 2. For n = 1.3, cv = 0.718 kJ/(kg-K), and cp = 1.005 kJ/(kg-K), determine p2 in bar. determine T4 in deg-C. determine T2 in deg-C. determine the heat transfer during heat addition process per unit mass in kJ/kg.
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 9.5 with p1 = 100 kPa, T1 = 340 K, and T3 = 4850.3 K, r = 15 and rc = 2. For n = 1.3, cv = 0.718 kJ/(kg-K), and cp = 1.005 kJ/(kg-K), determine the heat transfer during heat addition process per unit mass in kJ/kg.
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 9.5 with p1 = 100 kPa, T1 = 340 K, and T3 = 4850.3 K, r = 12 and rc = 2. For n = 1.3, cv = 0.718 kJ/(kg-K), and cp = 1.005 kJ/(kg-K), determine T2 in K.
On my online homework, it says the answer for part b, 40.156% is incorrect. Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.35. The compression ratio is 10 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle (see image below). (b) the percent thermal efficiency. (c) the mean effective pressure, in bar.
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 9.5 with p1 = 100 kPa, T1 = 340 K, and T3 = 4850.3 K, r = 15 and rc = 2. For n = 1.3, cv = 0.718 kJ/(kg-K), and cp = 1.005 kJ/(kg-K), a.) determine T2 in deg-C. b.) determine p2 in bar. c.) T4 in deg-C. d.) the mean effective pressure in kPa, for the modified cycle. e.) the heat transfer during heat addition process per unit mass in kJ/kg.
Solve the problem below on a cold air-standard basis with specific heats evaluated at 300 K: At the beginning of the compression process of an air-standard Otto cycle, p1 = 1 bar, T1 = 290 K, V1 = 400 cm3.The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine: (a) the heat addition, in kJ. (b) the net work, in kJ. (c) the thermal efficiency. (d) the mean effective pressure, in bar.Let T0 = 290 K, p0 = 1 bar.
Q#01 An air-standard cycle consists of the following processes:(i) isentropic compression from 15C, 1.01 bar through a compression ratio of 5:1.(ii) heat addition at constant volume of 2600 kJ/kg.(iii) reversible adiabatic expansion to the initial volume.(iv) heat rejection isochorically.For air take R = 0.287 kJ/(kg·K) and cP = 1.005 kJ/(kg·K). Sketch the cycle on P-v andT-s diagrams, and calculate its ideal efficiency, mean effective pressure and peak pressure. Take the start of isentropic compression as state point 1.Now the cycle above is modified in two ways so the heat is added, i.e.,(a) isobarically, and(b) half isochorically and half isobarically.Take the start of isentropic compression in both the cases as state point 1. Compressionratio is increased so as to follow the same peak pressure as before. Now sketch these twocycles on both P-v and T-s diagrams, and calculate their ideal efficiencies and mean effective pressures. The values of R and cP remain the same.
Consider an air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below. Determine (a) the cutoff ratio. (b) the heat addition per unit mass, in kJ/kg. (c) the net work per unit mass, in kJ/kg. (d) the thermal efficiency.
At the beginning of the compression process of an air-standard Otto cycle, P1=1bar, T1=290K, V1=400cm3. The maximum temperature in the cycle is 2200K and the compression ratio is 8. Determine the (a) heat addition, in kJ, (b) ????, in kJ, (c) thermal efficiency, and (d) mean effective pressure, in kPa. Consider the cycle as a model of the processes in each cylinder of a spark-ignition engine. Determine the (e) net power output, in kW, if the engine has four cylinders and the cycle is repeated 1200 times per minute in each cylinder. Also, (f) show the T-s and P-? diagrams. Note that the specific heats are NOT constant.
At the beginning of the compression process of an air-standard Otto cycle, p1 = 1 bar and T1 = 300 K. The compression ratio is 8.5 and the heat addition per unit mass of air is 1400 kJ/kg.Determine:(a) the maximum temperature of the cycle, in K.(b) the net work, in kJ/kg.(c) the percent thermal efficiency of the cycle.(d) the mean effective pressure, in kPa.