Problem 2 (10 pts)You are asked to analyze an ideal air-standard Diesel cycle. The temperature before and after compression is 300 K and 900 K,respectively, and the cut-off ratio is 2.5. If specific heats vary with temperature, determine the compression ratio, maximumtemperature in the cycle, and the temperature after expansion in K.Bonus (2 pts)Determine the amount of heat added to the cycle in kJ/kg.

The Problem An ideal air-standard Diesel cycle. We're given the temperatures before and after…

Answered: Problem 2 (10 pts) You are asked to…

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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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.
Thermodynamics
I only need help with letter i. 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.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.
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 80 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 1950 K. Step 1 Determine the compression ratio. r = i Save for Later Attempts: 0 of 3 used Submit Answer Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above. Ston 3
A Closed Brayton Cycle operates with 20kg/s of air. Air at the beginning of compression is at 25 °C. Pressure ratio is 12. Highest temperature in the cycle is 650 °C. SOLVE FOR a.) Determine the Thermal Efficiency of this cycle in (%) b.) Determine the amount of heat rejected in (kJ/s) c.) Determine the Work Net of this cycle. ANSWERS SHOULD BE ROUND OFF IN SIX SIGNIFICANT FIGURES
question 2 2. Compare the variation of the thermal efficiency with the compression ratio for the Otto and Diesel engines respectively.
If the compression ratio and the cut-off ratio in a diesel engine are 15 and 3 respectively, what is the expansion ratio?
2
The state at the beginning of compression of an air-standard Diesel cycle is fixed by p₁ = 100 kPa and T₁ = 310 K. The compression ratio is 18 and the cutoff ratio is 1.9. Determine: (a) the maximum temperature, in K. (b) the pressure at the end of the expansion, in kPa. (c) the net work per unit mass of air, in kJ/kg. (d) the percent thermal efficiency.
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2150 K. Step 1 X Your answer is incorrect. Determine the compression ratio. r = i 9.64 Hint Save for Later Attempts: 1 of 3 used Submit Answer Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above. Step 3 The parts of this question must be completed in order. This part will be available when you complete the part above. Step 4 The parts of this question must be completed in order. This part will be available when you complete the part above.
Draw and label the P-V and T-S diagrams. In an ideal Brayton cycle, air enters the compressor section at 14.7 psia and 55°F. The pressure ratio is 12. Turbine inlet condition of 1300°F. Determine the following:a. Pressure, specific volume & temperature at each stateb. Compression ratio
3. Define any four performance parameters of a gas turbine engine with the help of well-defined equations.

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