FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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4.7 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.
A reciprocating compressor compresses air 1/8 th times of its initial volume. If the pressure of air beforecompression is 5 bar and volume of air after compression is .016m 3 , when the law followed is pv 1.6 =constant. Calculate the work done and draw the process on PV diagram.
Nitrogen with a mass of 1.5 kg expands at a constant pressure. The initial pressure and temperature in the piston
cylinder assembly is 170 kPa and 27 deg. C, respectively. Due to heat transfer, the system reached a final
temperature of 200 deg. C. Calculate the heat required and the non flow work. Please show the solution. Thank you
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- 3kg 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_forwardQ2: 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 rigid tanks are filled with water. Tank A is 0.2 m³ at 100 kPa, 150°C and tank B is 0.3 m³ at saturated vapor 300 kPa. The tanks are connected by a pipe with a closed valve. We open the valve and let all the water come to a single uniform state while we transfer enough heat to have a final pressure of 300 kPa. Give the two property values that determine the final state and find the heat transfer. B Aarrow_forward
- L An iniially empty bottle is illed with water from a line at 0.8 MPa and 350-C. Assume that there is no heat transfer and that the bottle is closed when the pressure reaches the line pressure, If the final mass is 0.7 kg, find the final temperature and the volume of the botle.arrow_forwardAir 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 psiaarrow_forwardOnly solve if u are 100% sure about Solarrow_forward
- Q2/ A 0.2 m' cylinder containing of air has an externally loaded piston. Initially the air at 350 kPa, 150 °C. Now the air is compressed depending of the relation PV4 = constant to a final temperature 250 °C. Determine the heat transfer during the process.arrow_forwardDraw Pv and Ts diagram of reversible isobaric process. Write the relationship between thermodynamic properties.arrow_forwardA frictionless piston-cylinder device encloses 0.226 kg of saturated water-vapour mixture which is initially 10% by mass in liquid. The initial pressure is 1.035 MPa. The fluid is now heated until it all becomes saturated vapour. a. Find the work done during the process. Now, suppose that there is a stop in the cylinder that limits the piston to stop at the top when the volume is 0.0424 m'. b. Find the quality of the mixture when the piston just reached the stop, i.e. when the fluid volume is at 0.0424 m³.arrow_forward
- 3. In a hot water heating system, water heated to 95°C and then is pumped at the rate of 4 L/min through a radiator where it is cooled to 35°C. If the water arives at the radiator at a temperature of 85°C, how much heat in kJ does the radiator release each hour?arrow_forwardQ3: Two kilograms of nitrogen at 100 K, x =0.5 is heated in a constant pressure process to 300 K in a piston/cylinder arrangement. Find the initial and final volumes and the total heat transfer required.arrow_forward4. A pressure cooker (closed tank) contains water at 100°C, with the liquid volume being 1/20th of the vapor volume. It is heated until the pressure reaches 2.0 MPa. Find the final temperature. Has the final state more or less vapor than the initial state?arrow_forward
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