1. Use constant specific heats at room temperature in solving the problem.An air-standard cycle with variable specific heats is executed in a closed system with0.005 kg of air and consists of the following three processes:1-2 v= constant heat addition from 95 kPa and 18°C to 375 kPa2-3 Isentropic expansion to 95 kPa3-1 P = constant heat rejection to initial state(a) Show the cycle on P-v and T-s diagrams.(b) Calculate the net work per cycle, in kJ.(c) Determine the thermal efficiency.

The air standard cycle consists of three processes:Process 1-2: Constant volume heat additionProcess…

Answered: Use constant specific heats at room…

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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An air standard cycle is executed in a closed system and composed of the following processes 1-2 Isentropic compression from 90 kPa and 77°C to 1 MPa 2-3 Pressure=constant heat addition in amount of 3500 kJ/kg 3-4 volume=constant heat rejection to 90 kPa 4-1 Pressure=constant heat rejection to initial state Calculate the maximum temperature in the cycle in kelvin and the cycle thermal efficiency?
An air-standard cycle with variable specific heats is executed in a closed system with 0.0045 kg of air and consists of the following three processes: 1–2 v = Constant heat addition from 95 kPa and 17°C to 380 kPa 2–3 Isentropic expansion to 95 kPa 3–1 P = Constant heat rejection to initial state Use data from tables. Calculate the thermal efficiency % ? Hint : The answer should be a percentage
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.
Air in an ideal Diesel cycle is compressed from 2 to 0.13 L, and then it expands during the constant-pressure heataddition process to 0.30 L. Under cold-air-standard conditions, the thermal efficiency of this cycle is (a) 41 percent (b) 59 percent (c) 66 percent (d) 70 percent (e) 78 percent
An air-standard cycle is executed within a closed piston–cylinder system, and it consists of the following three processes: 1–2 V = Constant heat addition from 100 kPa and 32°C to 850 kPa 2–3 Isothermal expansion until V3 = 8.5V2 3–1 P = Constant heat rejection to the initial state Assume air has constant properties with cv = 0.718 kJ/kg·K, cp = 1.005 kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4. Determine the cycle 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 1950 K. Determine the thermal efficiency of the cycle in %.
A gas-turbine power plant operating on an ideal Brayton cycle has a pressure ratio of 8. The gas temperature is 300 K at the compressor inlet and 1300 K at the turbine inlet. Utilizing the air-standard assumptions and by accounting for the variation of specific heats with temperature, determine the thermal efficiency. The air can be treated as an ideal gas with κ = 1,4 and cp = 1006 J/(kg·K).
An air-standard cycle with constant specific heats is executed in a closed piston–cylinder system and is composed of the following three processes: 1-2 Isentropic compression with a compression ratio r = V1/V2 2-3 Constant-pressure heat addition 3-1 Constant-volume heat rejection (a) Sketch the P-v and T-s diagrams for this cycle. (b) Obtain an expression for the back work ratio as a function of k and r.
An air-standard cycle, called the dual cycle, with constant specific heats is executed in a closed piston–cylinder system and is composed of the following five processes: 1-2 Isentropic compression with a compression ratio, r = V1/V2 2-3 Constant-volume heat addition with a pressure ratio, rp = P3/P2 3-4 Constant-pressure heat addition with a volume ratio, rc = V4/V3 4-5 Isentropic expansion while work is done until V5 = V1 5-1 Constant-volume heat rejection to the initial state. Sketch the P-v and T-s diagrams for this cycle.
Air is used as the working fluid in a simple ideal Brayton cycle that has a pressure ratio of 12, a compressor inlet temperature of 300 K, and a turbine inlet temperature of 1000 K. Determine the required mass flow rate of air for a net power output of 70 MW, assuming both the compressor and the turbine have an isentropic efficiency of 85 percent. Assume constant specific heats at room temperature.
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 specific heats with temperature. a) the temperature of the air at the exit of the turbine, b) the working of the cycle, c) Calculate the thermal efficiency of the cycle.
For a specified compression ratio, is a diesel or gasoline engine more efficient?

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