FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Three-tenths kmol of carbon monoxide (CO) in a piston– cylinder assembly undergoes a process from p1 = 150 kPa, T1 = 300 K to p2 = 500 kPa, T2 = 420 K. For the process, W = -300 kJ.Employing the ideal gas model, determine:(a) the heat transfer, in kJ.(b) the change in entropy, in kJ/K.
Water contained in a closed, rigid tank, initially at 100 lbf/in2, 800°F, is cooled to a final state where the pressure is 25 lbf/in².
Determine the quality at the final state and the change in specific entropy, in Btu/lb-ºR, for the process.
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- A mass of 3 kg of water contained in a piston–cylinder assembly expand from an initial state where T1 = 551°C, p1 = 700 kPa to a final state where T2 = 224°C, p2 = 300 kPa, with no significant effects of kinetic and potential energy. It is claimed that the water undergoes an adiabatic process between these states, while developing work. Evaluate entropy production in Joules/k.arrow_forwardWater contained in a closed, rigid tank, initially at 100 lbf/in2, 800oF, is cooled to a final state where the pressure is 25 lbf/in2.Determine the quality at the final state and the change in specific entropy, in Btu/lb·oR, for the process.arrow_forwardA divider separates 1 lb mass of carbon monoxide (CO) from a thermal reservoir at 150o F. the carbon monoxide, initially at 60o F and 150 lbf/in2, expands isothermally to a final pressure of 10 lbf/in2 while receiving heat transfer through the divider from the reservoir. The carbon monoxide can be modeled as an ideal gas. (a) For the carbon monoxide as the system, evaluate the work and heat transfer, each in Btu and the amount of entropy produced, in Btu/oR. (b) Evaluate the entropy production, in Btu/oR, for an enlarged system that includesthe carbon monoxide and the divider, assuming the state of the divider remains unchanged. Compare with the entropy production of part (a) and comment on the difference.arrow_forward
- A 380-L tank contains steam, initially at 440°C, 3 bar. A valve is opened for 10 seconds and steam flows out of the tank at a constant mass flow rate of 0.005 kg/s. During steam removal, a heater maintains the temperature within the tank constant. Determine final mass remaining in the tank, in kg, and the final pressure in the tank, in bar.arrow_forwardTwo kilograms of water contained in a piston–cylinder assembly, initially saturated vapor at 340 kPa, is condensed at constant pressure to saturated liquid. Consider an enlarged system consisting of the water and enough of the nearby surroundings that heat transfer occurs only at the ambient temperature of 25oC. Assume the state of the nearby surroundings does not change during the process, and ignore kinetic and potential energy effects. For the enlarged system, determine the heat transfer, in kJ, and the entropy production, in kJ/K.arrow_forward2 kg of air at 5 bar, 80°C expands adiabatically in a closed system until its volume is doubled and itstemperature becomes equal to that of the surroundings which is at 1 bar, 5°C. For this process, determine :(i) The maximum work ;(ii) The change in availability ;(iii) The irreversibility.For air take : cv= 0.718 kJ/kg K, u = cvT, where cvis constant and pV = mRT, where p is in bar, V volumein m3, m mass in kg, R is constant equal to 0.287 kJ/kg K, and T temperature in K.arrow_forward
- Refrigerant 134a at p1 = 30 lbş/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 250 lb/h and exits as saturated vapor at p2 = 160 lbę/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 2.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.arrow_forwardA cylinder that contains 0.068 kg of carbon dioxide (with molar mass 44 kg/kmol), occupying a volume of 0.027 m3 at 1 bar is compressed reversibly until the pressure is 5.27 bar. If the molar (universal) gas constant as 8.3145 kJ/kmol K, calculate the the work done on the C02 (in J) when the process is isothermal.arrow_forwardThree-tenths kmol of carbon monoxide (CO) in a piston- cylinder assembly undergoes a process from p1 = 150 kPa, T1 = 300 K to p2 = 500 kPa, T2 = 370 K. For the process, W = -300 kJ. Employing the ideal gas model, determine: (a) the heat transfer, in kJ. (b) the change in entropy, in kJ/K. Part A Employing the ideal gas model, determine the heat transfer, in kJ. kJ Save for Later Attempts: 0 of 1 used Submit Answer Part B The parts of this question must be completed in order. This part will be available when you complete the part above.arrow_forward
- Refrigerant 134a at p1 = 30 lbe/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 400 Ib/h and exits as saturated vapor at p2 = 160 Ib/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 4 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr.°R.arrow_forwardArgon (molar mass 40 kg/kmol) compresses reversibly in an adiabatic system from 5 bar, 25 0C to a volume of 0.2 m3. If the initial volume occupied was 0.9 m3, calculate the work input in MJ to 3 decimal places. Assume nitrogen to be a perfect gas and take cv = 0.3122 k J / k g K.arrow_forwardWhen two systems are in contact, the entropy transfer from the warmer system is equal to the entropy transfer into the cooler one at the point of contact. That is, no entropy can be created or destroyed at the boundary since the boundary has no thickness and occupies no volume.arrow_forward
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