An ideal Brayton cycle is used in a gas-turbine power plant with two stages of expansion and two stages of compression. 3. Air enters each stage of the compressor and turbine at 17 °C and 1067 °C, respectively. If the overall pressure ratio is 9.5, determine the efficiency of the cycle considering the variation of specific heat with temperature. O a. 37.2% Ob. 42% O c. 36.8% O'd. 28.9% e. 48.1%

An ideal Brayton cycle is used in a gas-turbine power plant with two stages of expansion and two stages of compression. 3. Air enters each stage of the compressor and turbine at 17 °C and 1067 °C, respectively. If the overall pressure ratio is 9.5, determine the efficiency of the cycle considering the variation of specific heat with temperature. O a. 37.2% Ob. 42% O c. 36.8% O'd. 28.9% e. 48.1%

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

See similar textbooks

Similar questions

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. Work, per unit massb. Heat Rejected, per unit massc. Thermal Efficiency
3. An air-standard Otto cycle operates with a compression ratio of 8 and a maximum temperature per cycle of 1400 K. If the temperature and pressure at the beginning of compression stroke are 300 K and 100 kPa respectively, determine the following assuming air to be an ideal gas with constant specific heats Cp = 1.005 kJ/kg K and Cv = 0.718 kJ/kg K: (a) The heat supplied (b) The work produced (c) The thermal efficiency.
An air-standard dual cycle has a compression ratio of 8.6 and displacement of Vd= 2.2 L. At the beginning of compression, p1= 95 kPa, and T1 = 290 K. The heat addition is 4.75 kJ, with one quarter added at constant volume and the rest added at constant pressure. Determine: a) each of the unknown temperatures at the various states, in K. b) the net work of the cycle, in kJ. c) the power developed at 3000 cycles per minute, in kW. d) the thermal efficiency. e) the mean effective pressure, in kPa. Step 1 X Your answer is incorrect. Determine each of the unknown temperatures at the various states, in K. T2 = i 685.79 K T3 = i 1268.14 K T4 = i 2531.97 K T5 = i 0.55 K Hint
An air-standard Otto cycle has a compression ratio of 9. At the beginning of compression, P1 = 100 kPa and T1 = 300 K. The heat addition per unit mass of air is 1350 kJ/kg. Determine: a) the net work, in kJ per kg of air b) the thermal efficiency of the cycle c) the mean effective pressure, in kPa
H.W2: An air-standard Carnot cycle is executed in a closed system between the temperature limits of 350 and 1200 K. The pressures before and after the isothermal compression are 150 and 300 kPa, respectively. If the net work output per cycle is 0.5 kJ, determine (a) the maximum pressure in the cycle, (b) the heat transfer to air, and (c) the mass of air. Assume variable specific heats for air. Answers: (a) 30,013 kPa, (b) 0.706 kJ, (c) 0.00296 kg
Consider the operation of the ideal Brayton cycle with a regenerator. The maximum temperature in the cycle is set. What happens with increasing pressure ratio? Group of answer choices The amount of heat added in the cycle up to a point will decrease with net work output remaining the same and thermal efficiency will increase. Thermal efficiency will increase Compressor exit temperature will increase with turbine exit temperature remaining the same. When the two temperatures are equal, the benefit of the regenerator will be zero. Thermal efficiency will decrease
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 steady-flow system operating on the ideal Ericsson cycle can achieve the Carnot efficiency. One of the salient features of this cycle is the isothermal expansion through a heated turbine, as shown in Fig. a. Heat is added to the turbine such that the outlet temperature is equal to the inlet temperature, i.e. T₁=T₂, and the overall pressure ratio for this process is rₚ=P₁/P₂. However, an isothermal expansion through a heated turbine is very difficult to achieve in practical engineering applications. An alternate approach is two use a multi-stage expansion process with reheating. In this approach, the gas expansion process is carried out in multiple stages with reheating in between each stage. Consider the two-stage turbine expansion with reheating shown in Fig. b. The gas enters the first stage of the turbine at state A1, is expanded isentropically to an intermediate pressure Pₐ₂, is reheated at constant pressure to state B1, and is expanded in the second stage isentropically to the…
The displacement volume of an internal combustron engine is 5.6 liters. The processes within each cylinder of the engine are modeled as an air-standard Diesel cycle with a cutoff ratio ß of 2.4. The state of the air at the beginning of compression is fixed by P 95 kPa, T= liters. For air, take specific heat ratio y 1.4, and R 0.287 kJ kg.K. Determine the net work per cycle, in kl. //int find the temperatures at all states and apply Ocycle= Weycle) b. If the net work per cycle is equal to 4.78 kJ. determine the indicated mean effeetive pressure in kPa, Determine the thermal efficiency. d. Determine the power developed by the engine, in kW, if the cycle is executed 1500 times 27°C, and V = 6.0 a. C. per min