Q7: An amount of a perfect gas has initial conditions of volume (1 m³), pressure(1 bar) and temperature (18 °C). It undergoes ideal Diesel cycle operation, thepressure after isentropic compression being (50 bar) and the volume after constantpressure expansion being (0.1 m³). Calculate the temperature at the major points ofthe cycle and evaluate the thermal efficiency of the cycle. Assume y=1.4 for the gasAnswers T2-890 K, T3 1455 K, T4-579 K, 63.59%

Answered: Q7: An amount of a perfect gas has…

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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Air enters an ideal gas turbine cycle at 1 bar and 27 C. The maximum temperature in the cycle is 727 C. Find the cycle efficiency for a compression ratio of 10. [Ans.: 0.482].
Q2/ Calculate the thermal efficiency of the heat engine working on the diesel cycle takes in air at 1 bar, 20 °C, and a compression ratio 12 and the highest temperature during the cycle was 1100 °C. Take c, 1.005 kJ/kg-K, c,= 0.718 kJ/kg-K for air.
In an air standard Brayton cycle the air enters the compressor at 0.1 MPa, 25 ∘C. The pressure leaving the compressor is 1 MPa. and the maximum temperature in the cycle is 1200 ∘C. Assume a compressor efficiency of 80%, a turbine efficiency of 85%, and a pressure drop between the compressor and turbine of 30 kPa. Use the PG model. a) Determine compressor work (w_C), b) Determine the turbine work (w_T), c) Determine the cycle efficiency (n_th,Brayton).
The volume ratios of compression and expansion for a diesel engine as measured from an indicator diagram are 16 and 8 respectively. The pressure and temperature at the beginning of the compression are 1 bar and 28°C. Assuming an ideal engine, determine the mean effective pressure, the ratio of maximum pressure to mean effective pressure and cycle efficiency. Also find the fuel consumption per kWh if the indicated thermal efficiency is 0.5 of ideal efficiency, mechanical efficiency is 0.8 and the calorific value of oil 42000 kJ/kg. Assume for air : cp = 1.005 kJ/kg K ; cv = 0.718 kJ/kg K, ã = 1.4. Please also draw the PV diagram.
OTTO CYCLE At the start of an air-standard Otto cycle's compression process, P1 = 1 bar, T1 = 300 K, V1 = 380cm3. The maximum temperature in the cycle is 2400 K and the compression ratio is 9. Determine the: (a) heat addition, in kJ (b) the net-work in kJ (c) the thermal efficiency (d) the mean effective pressure, in bar. Show complete solution.
Q2: A compression-ignition engine has a compression ratio of 15, which can be analysed based on the diesel air-standard cycle. The pressure and temperature at the beginning of compression are 1 bar and 18C, and the air-fuel ratio is 28:1; and the calorific value of the fuel is 44 MJ/kg. Find the maximum pressure (kPa) and temperature (K); the cut-off ratio; the thermal efficiency (%); the work done (kJ/kg) and the imep (kPa) of the engine. Assume: Cp = 1.01 kJ/kg.K ; R= 0.287 kJ/kg.K and k= 1.4.
pls answer part c, d and e
Having difficulty with this engineering problem. At the beginning of the compression process of an air standard Otto cycle, p1 = 1 bar, T1 = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of Vd = 2.1 L. Determine per cylinder: a) the volume at state 1 in L.b) the air mass per cycle.c) the heat addition per cycle, in kJ.d) the heat rejection per cycle, in kJ.e) the net work per cycle, in kJ.f) the thermal efficiency.g) the mean effective pressure, in bar.h) Develop a full exergy accounting per cycle, in kJ. Let T0 = 300 K, p0 = 1 bar.i) Devise and evaluate the exergetic efficiency for the cycle.
An ideal air-standard Brayton cycle operating at steady state produces 10 MVWof power. Operating data at principal states in the cycle are given in the table below. The states are numbered as in the figure below. State p(kPa) T (K) h (kJ/kg) 1 100 300 300 1000 574.1 579.7 3 1000 1800 2002 4 100 1034 1085
Sketch and label Pv and Ts diagrams
The temperature at the beginning of a compression process of an air standard Otto cycle with acompression ratio of 8 is 300 K, the pressure is 1 bar and the cylinder volume is 560 cm3. Themaximum temperature during the cycle is 2000 K. Determine a) the temperature, pressure andvolume at the end of each process of the cycle, tabulating your answers, b) the thermal efficiencyof the cycle, and c) the mean effective pressure, in Bar. Take γ = 1.4, and cv = 718 J/kg/K
pls answer part f, g ,h and i

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