FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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The subject is Thermodynamics 1
Processes of Ideal Gases
Water vapor enters a turbine at p1 = 5 bar, T1 = 500oC and exits at p2 = 1 bar. The work developed is measured as 351 kJ per kg of water vapor flowing. Determine the isentropic turbine efficiency.
1. thermodynamics
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- An oxygen gas R = 0.2598 KJ/kg°k and k = 1.395. If 4 kg of oxygen undergo a reversible non flow constant pressure process from initial volume =1.2 cubic meter and initial pressure = 690 kPa to a state where final temperature = 600°C. 1. Determine the Change in Internal Energy. choices: a.200.60 KJ. b.198.45 KJ. c.99.54 KJ. d.200.55 KJ 2. Determine the constant pressure-specific heat. choices: a.0.9865 KJ/kg-°K. b.0.9175 KJ/kg-°K. c.0.8580 KJ/Kg-°K. d.0.7843 KJ/kg-°K need complete solution, cancellation and symbol:)arrow_forwardA piston cylinder device contains 0.2 kg of air initially at 0.06 m³ and 3 bar. The air is first compressed isometrically to 5 bar then expanded isothermally to the initial pressure, and finally compressed at a constant pressure to the initial state. 1. Draw the PV diagram 2. The net work of the cycle. Is this a realistic cycle? 3. Heat lost or gained (Q) during the constant pressure processarrow_forwardQuestion 4 A steam turbine operates with an inlet condition of 30 bar, 400 °C, 160 m/s and an outlet state of a saturated vapour at 0.7 bar with a velocity of 100 m/s. The mass flow rate is 1200 kg/min and the power output is 10800 kW. Present the process on the T-v diagram. Determine the magnitude and direction of the heat-transfer rate in kJ/min if the potential energy change in negligible.arrow_forward
- The figure belows shows three components of an air-conditioning system, where 105°F and 4.5 lb/s. Refrigerant 134a flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Modeling air as an ideal gas with constant cp = 0.240 Btu/lb · °R, determine the mass flow rate of the air, in lb/s.arrow_forwardA fluid at 0.6 bar occupying 0.1 m° is compressed reversibly to a pressure of 11.1 bar and specific volume of 0.4 m/kg according to the law pv =c. The fluid then expands reversibly according to the law pv = c to 2.1 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the value of n in the procesS.arrow_forwardA steam turbine operates with an inlet condition of 30 bar, 400 0C, 160 m/s and an outlet state of a saturated vapour at 0.7 bar with a velocity of 100 m/s. The mass flow rate is 1200 kg/min and the power output is 10800 kW. present process is on T-V diagram. Determine the magnitude and direction of the heat transfer rate in kJ/min if the potential energy change is negligible.arrow_forward
- The work required to compress a gas reversibly according to PV1.30 = C is 67,790 J if there is no flow. Determine: Change in internal energy in kJ if the gas is air Heat in kJ if the gas is air Change in internal energy in kJ if the gas is methane Heat in kJ if the gas is methane NOTE: For methane, k = 1.321, R = 518.45 J/kgm-K, Cv = 1.6187 kJ/kgm-K, Cp = 2.1377 kJ/kgm-K.arrow_forwardQ1: 0.09 m³ of a fluid at 0.7 bar are compressed reversibly to a pressure of 3.5 bar according to a law py"=constant. The fluid is then heated reversibly at a constant volume until the pressure is 4 bar; the specific volume is then 0.5 m³/kg. A reversible expansion according to a law pv²=constant restores the fluid to its initial state. Calculate the net work done on or by the fluid in the cycle and sketch the cycle on a p-v diagramarrow_forward3. Air is contained within a piston-cylinder assembly The cross sectional area of the piston is 0.01 m². Initially the piston is at 1 bar and 25°C, 10 cm above the base of the cylinder. In this state, the spring exerts no force on the piston. The system is then reversibly heated to 100°C. As the spring is compressed, it exerts a force on the piston according to: F=-kx where k= 50,000 N/m and x is the displacement length from its uncompressed position. Determine the work done. a. -166 J b. -216 J c. 166 J d. 216 Jarrow_forward
- Please help me solve this problem. I need it asap. Thank you.arrow_forwardA fluid at 0.5 bar occupying 0.08 m3 is compressed reversibly to a pressure of 10.9 bar and specific volume of 0.6 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 1.6 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the net work for the process in Joules.arrow_forwardAn oxygen gas R = 0.2598 KJ/kg°k and k = 1.395. If 4 kg of oxygen undergo a reversible non flow constant pressure process from initial volume =1.2 cubic meter and initial pressure = 690 kPa to a state where final temperature = 600°C. Determine the Change in Enthalpy. choices: a.279.60 KJ. b.279.76 KJ. c.278.49 KJ. d.278.59 KJ need complete solution, cancellation, and symbol.arrow_forward
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