FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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4. A quantity of steam of mass 2.5 kg at 86 bar occupies a volume of 0.052 m³ in a cylinder behind a
piston expands reversibly at constant temperature to a pressure of 40 bar.
Sketch the process on the p-v and T-s diagrams and calculate the heat and work transfers in kJ.
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.
When 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.
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- Pravinbhaiarrow_forwardA piston-cylinder device contains 2 kg of water which is initially a saturated liquid at 300 ∘ C. It undergoes three processes to form a cycle. The first process is constant volume, the second is constant pressure at 2 bar and the third is a polytropic process where Pv 1.1 = constant. If you can calculate the heat transfer and work (both in kJ ) for each process. Is the device a heat engine or a refrigerator? Answer Table Description Work transfer for first process (kJ) Heat transfer for first process (kJ) Work transfer for second process (kJ) Heat transfer for second process (kJ) Work transfer for third process (kJ) Heat transfer for third process (kJ) Heat engine (1) or refrigerator (2) Value Value Thank youarrow_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_forward
- 1 kg of water, T1 = 300 ° C, P1 = 200 kPa in a piston-cylinder assembly passes a process to its final state at constant pressure T2 = 150 ° C by throwing heat from its initial state to the surrounding environment. At the end of this process, determine(a) Piston boundary work, (b) The amount of heat discharged from the piston to the surrounding environment, (c) The amount of entropy produced by the piston cylinder (d) The amount of entropy produced by the surrounding environment. (Take the piston cylinder surface temperature 150 ° C!)arrow_forward1 kg of water, T1 = 300 ° C, P1 = 200 kPa in a piston-cylinder assembly passes a process to its final state at constant pressure T2 = 150 ° C by throwing heat from its initial state to the surrounding environment. At the end of this process, determine (a) Piston boundary work, (b) The amount of heat discharged from the piston to the surrounding environment, (c) The amount of entropy produced by the piston cylinder (d) The amount of entropy produced by the surrounding environment. (Take the piston cylinder surface temperature 150 ° C!) witer ! ambient enviroņment 1 kgarrow_forwardA rigid cylindrical tank stores 80 kg of a substance at 400 kPa and 480 K while the outside temperature is 290 K. A paddle wheel stirs the system transferring shaft work at a rate of 0.7 kW. At the same time an internal electrical resistance heater transfers electricity at the rate of 1.6 kW. A. Do an energy analysis to determine the rate of heat transfer for the tank. B. Determine the absolute value of the rate at which entropy leaves the internal system (at a uniform temperature of 480 K). Answer in kW/K C. Determine the rate of entropy increase in the system's surroundings. Answer in kW/Karrow_forward
- A quantity of gas at 1.4 bar and 25 oC occupies a volume of 0.1 m3 in a cylinder behind a piston is compressed reversibly to a final pressure of 7 bar and a temperature of 60 oC. Sketch the process line on the p-v and T-s diagrams relative to the process line for a reversible adiabatic process and calculate the work and heat transfers in kJ and the change in entropy in kJ/K. The specific heat capacity at constant pressure, cp is 1.04 kJ/kg K and the specific gas constant, R is 0.297 kJ/kg K.arrow_forwardA container of 1.5 Kg of gas is at a temperature and pressure of 293 K and 1 bar respectively. The gas is adiabatically compressed until its temperature and pressure are 450 K, 4.49 bars. Adiabatic processes are processes with no heat transfer. The properties of this gas are cv = 10.3 KJ/(Kg K) and R = 4.158 KJ/(Kg K). Neglect kinetic and potential energy terms. Use the first law to determine the work into the system. Calculate the entropy production for this process. Is this a reversible process?arrow_forwardA fluid at 0.7 bar occupying 0.09 m3 is compressed reversibly to a pressure of 9.8 bar and specific volume of 0.3 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 1.2 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the work for the expansion in the process in Joules.arrow_forward
- A boiler is used to generate steam. Water enters the boiler, saturated at 60°C at an unknown flow rate. Superheated steam exits at 10 bar and 262°C. The energy input of the boiler is 420 KW. Determine the flow rate of water through the boiler, in kg/hr. Neglect kinetic and potential energy changes.arrow_forwardCarbon dioxide (molar mass 44 kg/kmol) expands reversibly in a perfectly thermally insulated cylinder from 3.7 bar, 220 0C to a volume of 0.085 m3. If the initial volume occupied was 0.02 m3, calculate the work input in kJ to 3 decimal places. Assume nitrogen to be a perfect gas and take cv = 0.63 k J / k g K.arrow_forwardThe entropy change of a system can be negative, but the entropy generation cannot.arrow_forward
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