FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A 400-L tank, A contains argon gas at 250 kPa, 30°C. Cylinder B, having a frictionless piston of such mass that a pressure of 150 kPa will float it, is initially empty. The valve is opened and argon flows into B and eventually reaches a uniform state of 150 kPa, 30°C throughout. What is the work done by the argon?
EXAMPLE 3
A certain fluid at 10 KPa is contained in a cylinder behind a
piston. The initial volume being 0.5 m'. Calculate the work done
by the fluid when it expands reversibly.
a- At constant pressure to a final volume of 0,7 m
b- according to a linear law to a final volume of 1 m' and
a final pressure of 2.5 bar
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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- As shown in the figure, a 260-ft tank contains 25 lb of H20 initially at 30 lbf/in?. The tank is connected to a large steam line carrying steam at 200 lbf/in?, 450°F. Steam flows into the tank through a valve until the tank pressure reaches p2 = 160 lbf/in? and the temperature is 400°F, at which time the valve is closed. Steam at Tank 200 lbf/in.2. Valve (1) Initially: 30 lbfin.?, mı = 25 lb (2) Finally: P, lbfin.?, 400°F. 450°F (1) Determine the amount of mass that enters the tank, in Ib, and the heat transfer to the tank from its surroundings, in Btu.arrow_forwardQ2: Steam at 7 bar, dryness fraction 0.96 is throttled down to 3.5 bar calculate the change of entropy per Kg of steam.arrow_forwardFind the total heat in kJ required for ice at -15°C to become vapor at 120°C. 2. Using the Steam Table shown, at initial pressure of 0.046 bar and final pressure of 0.107 bar, find the following: Δhf ; Δhg ; Δsf ; Δsgarrow_forward
- Q1: One kg of steam undergoes a reversible isothermal process from 20 bar and 250°C, to a pressure of 30 bar. Find the heat flow stating if it is supplied or rejected.arrow_forward5. An air receiver of volume 6 m3 contains air at 15 bar and 40.5°C. A valve is opened and some air is allowed to blow out to atmosphere. The pressure of the air in the receiver drops rapidly to 12 bar when the valve is then closed. Calculate the mass of air which has left the receiver.arrow_forwardAs shown in the figure, a 300-ft3 tank contains 25 Ib of H20 initially at 30 lbf/in?. The tank is connected to a large steam line carrying steam at 200 lbf/in?, 450°F. Steam flows into the tank through a valve until the tank pressure reaches p2 = 140 lbf/in? and the temperature is 400°F, at which time the valve is closed. Steam at Tank 200 lbf/in.2. 450°F Valve |(1) Initially: 30 lbf in.?, mı = 25 lb |(2) Finally: P, lbfin.?, 400°F. Determine the amount of mass that enters the tank, in Ib, and the heat transfer to the tank from its surroundings, in Btu.arrow_forward
- 16. A perfect gas has a valuen of R = 58.8 ft-lb/lb-R and k = 1.26. IF 20 %3D BTU are added to 5 lb of this gas at constant volume when the initial temperature is 90°F, find the final temperature, change in enthalpy, change in entropy, change in internal energy, and work non flow.arrow_forwardA room is divided by a barrier into two sections. One side of the room (state 1) has a volume of 1000 ft^3 and is initially at 70F, 50 psi and the other side of the barrier (state 2) has 200 lbm of air and is initially at 300F, 14.696 psi. The divider is removed and the air mixes until it reaches equilibrium (state 3). Find the final temperature and pressure of the room. You can assume removing the divider has a negligible effect on the air.arrow_forwardThermodynamicsarrow_forward
- Two 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_forwardA monatomic ideal gas is compressed isothermally from a volume of 2.0m^3 to 1.0 m^3. The initial pressure is 20 kPa. a. Find the work done on the gas from initial state to final state. b. Find the change in the internal energy of the gas. c. Find the amount of heat exchanged.arrow_forwardE.2) A paint shop compressor has a storage tank for compressed air with a volume of 1 m³. It initially contains air at 1 MPa and 400 K. The feed valve is opened and air flows into the tank until the pressure reaches 5 MPa and the inside temperature is 450 K. At that time the valve closes. Determine the amount of air that was introduced into the tank. Finally, after the tank cools down, it reaches a room temperature of 300 K. Determine the air pressure at that condition.arrow_forward
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