A gas-turbine engine operates on the ideal Brayton cycle with regeneration, as shown in Fig. P9–105. Now the regenerator is rearranged so that the airstreams of states 2 and 5 enter at one end of the regenerator and streams 3 and 6 exit at the other end (i.e., parallel flow arrangement of a heat exchanger). Consider such a system when air enters the compressor at 100 kPa and 20°C; the compressor pressure ratio is 7; the maximum cycle temperature is 727°C; and the difference between the hot and cold airstream temperatures is 6°C at the end of the regenerator where the cold stream leaves the regenerator. Is the cycle arrangement shown in the figure more or less efficient than this arrangement? Assume both the compressor and the turbine are isentropic, and use constant specific heats at room temperature.
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Chapter 9 Solutions
THERMODYNAMICS-SI ED. EBOOK >I<
- A gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 19, and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Choose the suitable thermodynamic cycleb. Draw pv and Ts diagram and label itc. Calculate the power required by the compressord. Determine the pressure and the temperature at the turbine exit,e. Compute the power produced by the turbinef. Available specific workg. The thermal efficiencyarrow_forwardWhat is the reaction equation of an impulse turbine?arrow_forwardA gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 18 k and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Choose the suitable thermodynamic cycleb.Draw pv and Ts diagram and label itCalculate the power required by the compressordDetermine the pressure and the temperature at the turbine exit,Compute the power produced by the turbinef.Available specific workg.The thermal efficiencyarrow_forward
- A six-cylinder, four-stroke, spark-ignition engine operating on the ideal Otto cycle takes in air at95 kPa and 17 °C, and is limited to a maximum cycle temperature of 870 °C. Each cylinder has abore of 8.9 cm and each piston has a stroke of 9.9 cm. The minimum enclosed volume is 14% ofthe maximum enclosed volume. How much power will this engine produce when operated at 2500rpm? Use constant specific heats at room temperature.arrow_forwardExplain why a certain amount of thermal energy rejected intentionally incondensers and pumps are employed instead of compressors in steam power cycles?arrow_forwardA gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 11, and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Compute the power produced by the turbineb Available specific workc. The thermal efficiency.arrow_forward
- A gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 11, and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Choose the suitable thermodynamic cycleb. Draw pv and Ts diagram and label itc. Calculate the power required by the compressord. Determine the pressure and the temperature at the turbine exit,e. Compute the power produced by the turbinef. Available specific workg. The thermal efficiency. Explain with clear writing and units and diagram Also if you use tables and equation mention it with explanationarrow_forwardA turbojet-powered aircraft is flying at 220 m/s and 8000-m altitude, where the ambient temperature and pressure are 236K and 35kPa, respectively.The pressure ratio of the compressor is 6 and the turbine inlet temperaturer is 970k. Estimate the thrust developed by the engine when the air flow rate is 55kg/s. employ an air standard-cycle analysis using the constant-pressurree specific heat c_p and specific heat ratio γ for air and neglecting the fuel properties.arrow_forwardConsider an ideal Otto cycle with cold-air-standard assumptions, and compression ratio of 14. The temperature and pressure at the beginning of the compression process are 350K and 0.2 MPa. The maximum air temperature in the cycle is found to be 2000K. Determine: the temperature and pressure at the end of each process of the cycle Determine: the thermal efficiency of the cycle Determine: the mean effective pressure of the cycle Determine: the entropy change per unit mass for the heat addition and heat rejection processarrow_forward
- A four-stroke and four-cylinder diesel engine with a stroke volume of 4 liters 18/1It has an air fuel ratio and works according to a mixed cycle. The compression ratio of the engine is 16/1 andThe cylinder diameter is 10 cm. The pressure and temperature at the start of compression are 100 kPa and 60°. your fuelIts calorific value is 42500 kJ/kg. Half of the heat input to the cycle is at constant volume and the other half at constant volume.since it takes place under pressure;a) Calculate the pressure and temperature values at all points and present them in a tabular form.b) Find the thermal efficiency.arrow_forwardAn air standard Carnot Cycle, is executed in a close system between the temperature limits of 350K and 1250K. The pressure before and after the isothermal compression are 150kPaa and 300kPa respectively. If the net work output per cycle is 0.80kJ, determine the following: (a) mass of air (kg), (b) thermal efficiency of the cycle (%), (c) Work of compression (kJ), (d) Work of Expansion (kJ), (e) heat added in the system (kJ) and (f) heat rejected by the system (kJ).arrow_forwardLet’s examine the engine of a Honda CB1000RR. But first, some idealizations:we will evaluate the engine using an ideal Otto cycle with variable specific heats.At the start of each cycle, air is at 100 kPa and 298 K, and has a gas constant of around 0.287kJ/kg-K. The maximum temperature at the end of heat addition is assumed to be 2200 K.The Honda CB1000RR has a four-stroke I4 spark-ignition (SI) engine: four cylinders, each with 25 cc (or cm3) of maximum volume. Its compression ratio is 10.8. At our preferred condition, the engine runsat 9,000 revolutions per minute, with two cylinders undergoing a power stroke every revolution.a. Sketch the Pressure (kPa) - volume (cc) and Temperature (K) - entropy (s) diagram of the cycle.For entropy, you may leave it as s1, s2, etc. b. Calculate the specific net work (kJ/kg) and the efficiency (%). c. Calculate the mean effective pressure (kPa) and the power produced by the engine (in kW).arrow_forward
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