FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Air as ideal gas in the closed system, find the change of entropy from the initial to the final state, in Btu/lb oR ( degree R ).
T1 = 360 oF (degree F), P1 = 14.7 psia
T2 = 540 oF (degree F), P2 = 58.8 psia
2.A piston cylinder arrangement contains steam at 10MPaa saturated liquid. Heat was
transferred isothermally so that the pressure reaches 2MPaa.
а.
Find the final temperature of the steam.
b. Find the change of entropy in kJ/kg if there is no entropy production.
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- Q2: One mole of air at P: and temperature Ti is compressed at constant volume till its pressure doubled. Then it is allowed to expand reversibly and isothermally to the original pressure and finally restored to the originol temperature by cooling at constant pressure. Sketch the processes on a P-V and calculate the net work done by thearrow_forwardTwo vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 140 L of air at 3000kPa, 90oC. Vessel B, of unknown volume, contains air at 70 kPa, 5oC. The valve is opened and, when the propertieshave been determined, it is found that pm = 1400 kPa, tm = 45oC. (a) What is the mass in kg of air initially inside vessel A (b) What is the volume of vessel B in liters?arrow_forward3kg of Co2 expanded in a stationary piston cylinder through a polytropic process from 30 degree Celsius and 250 kpa to 100kPa pressure. If the polytropic exponent, n = 1.45, find the total work, total heat transferred, total kinetic energy change and internal energy changearrow_forward
- Four kilograms per second of Methane is compressed isentropically from 104.3 kPa, 140 degree Fahrenheit to 440.6 degree Fahrenheit. Assuming that the process is for ideal gas, find: Final Pressure, torr Change in entropy Work, HParrow_forwardThermodynamics need a cancellations of unitsarrow_forward1. Find enthalpy if 5kg of certain gas go through a reversible non flow that has constant pressure process from initial volume 2.129m³and pressure of 700 kPa to a state where T2 550°C. A certain gas has R= 350J/kg-K and Cv = 0.94 kJ/kg-K a. 731.9675kJ b. 813.8610kJ c. 878.3610kJ d. 891.2610kJarrow_forward
- EXERCISES ON PROPERTIES OF STEAM 3). Ten kg of water 45 °C is heated at a constant pressure of 10 bar until it becomes superheated vapour at 300°C. Find the change in volume, enthalpy, internal energy and entropy.arrow_forwardQ2/ Air is contained in an insulated, rigid volume at 20°C and 200 kPa. A paddle wheel, inserted in the volume, does 720 kJ of work on the air. If the volume is 2m3, calculate the entropy increase assuming constant specifi c heats.arrow_forward4.7 The refrigerant R-22 is contained in a piston/cylinder as shown in Fig. P4.7, where the volume is 11 L when the piston hits the stops. The initial state is -30°C, 150 kPa with a volume of 10 L. This system is brought indoors and warms up to 15°C. a. Is the piston at the stops in the final state? b. Find the work done by the R-22 during this process.arrow_forward
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What is entropy? - Jeff Phillips; Author: TED-Ed;https://www.youtube.com/watch?v=YM-uykVfq_E;License: Standard youtube license