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A 3-ft3 rigid tank initially contains saturated water vapor at 300°F. The tank is connected by a valve to a supply line that car

zhannawk [14.2K]

Explanation:

$Given\\V=3ft^3\\T_{1} =300^oF\\T_{L} =400^oF\\P_{L} =200psia\\V_{f} =0.5V$

We assume kinetic and potential energy changes are negligible and there is no work interactions.

a) Taking tank as a system, The energy balance can be define as

$E_{in}- E_{out}= E_{sys}$

$m_{i} h_{L} -Q_{out}=m_{2} u_{2}-m_{1} u_{1}$

The mass balance could be written as

$m_{in}- m_{out}= m_{sys} \\m_{i}= m_{2}- m_{1}$

The final pressure in the tank could be defined as following

$P_{2} =P_{sat300^oF}$

from standard steam table we know at

$T_{2}= T_{1}=300^oF\\ P_{2}=67.028psia$

b)

From steam table at

$T_{1} =300^oF\\v_{1}= v_{g}=6.4663ft^3/lbm\\v_{1}= v_{g}=1099.8Btu/lbm\\ v_{f} =0.01745ft^3/lbm\\v_{f} =269.51Btu/lbm\\$

$at\\P_{L} =200psia\\T_{L}=400^oF\\h_{L}=1210.9Btu/lbm$

initial mass in the tank could be define as

$m_{1}=\frac{V}{v_{1} } \\m_{1} =\frac{3}{6.4663} =0.464lbm\\$

Final mass in the tank could be define as

$m_{2}=\frac{V_{f} }{v_{f} }+\frac{V_{g} }{v_{g} } \\ m_{2} =\frac{1.5}{0.01745} +\frac{1.5}{6.4663} =86.2lbm$

The amount of steam that has entered the tank

$m_{i}=m_{2}- m_{1}\\ m_{i}=86.2-0.464=85.74lbm$

c)

The internal energy in final state could be defined as following

$U_{2}=m_{f} u_{f}+ m_{g} u_{g}\\ U_{2} =85.96*269.51+0.232*1099.8=23422Btu\\$

The heat transfer could be defined as following

$Q_{out}=m_{i} h_{L}+m_{1} u_{1}-m_{2} u_{2}\\ Q_{out}=85.74*1210.9+0.464*1099.8-23422=80910Btu$

6 0

3 years ago

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Hiaaa I need help pwease" concerning the planetary orbits why was Copernicus somewhat inaccurate?"

Yuki888 [10]

Copernicus's heliocentric theory stated that the planets orbited in perfectly circular orbits. In reality, they are shaped like ellipses (ovals).

4 0

3 years ago

Pressure increases with depth towards the center of earth. In which layer would you expect pressure to be the greatest.

Amiraneli [1.4K]

You could expect to find it in the inner core

8 0

3 years ago

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WILL GIVE BRAINLIEST!

Andrews [41]

<u>Order sequence of steps that are involved in the production of work by a four-stroke heat engine as follows: </u>

Piston moves down, allowing fuel-air mixture to enter intake valve
Piston moves up, compressing gas and causing gas to increase its temperature
Combustion as gas is still compressed; increase in energy from combustion pushes piston down
Piston moves up, pushing burned gases through exhaust valve: Spark plug fires, causing

Answer: Options D, A, C and B

<u>Explanation: </u>

There are four basic steps of a four stroke engine- Intake, Combustion, Power and Exhaust. The first step is the intake of air plus fuel mixture in the combustion chamber. At this time, the piston moves down. Now when the chamber is closed, the spark plug ignites fire which expands the fuel gases.

The gases push down, piston and crankshaft rotates in this way. Once the gases the combustion is done, there is plenty of space in the chamber that makes the piston moves up. In this way a complete cycle is completed and the crankshaft moves. That’s the working of this four stroke engines.

6 0

3 years ago

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An inductor is connected to an AC generator. As the generator's frequency is increased, the current in the inductor A. Increases

Luda [366]

Answer:

B) Decrease

Explanation:

Resistance offered due to inductor in any AC circuit is given as

$X_L = \omega L$