Refrigerant 134a passes through a throttle valve as part of a refrigeration cycle. The fluid enters the valve as compressed liquid at a pressure of 0.8 MPa and a temperature of 25 C. It exits the valve at -20 C. Find the exit pressure and the exit specific internal energy.
Answers
The exit pressure will be 1.3273 bar = 0.1327 MPa and the exit specific internal energy 228.61 KJ/Kg .
1.) In graph,
1-2 = Compressor
3-4 = Throttle value
[tex]T_{1} \\[/tex] = [tex]T_{4}[/tex] = -20°C = 253 K
[tex]T_{3}[/tex] = 25°C = 298 K
[tex]P_{3}[/tex] = 0.8 MPa
Assuming saturated fluid is entering the value at point (3),
using table of R-134a properties
∵ [tex]h_{3} =h_{4}[/tex] = 234.49 KJ/Kg (at 25°C,8 bar)
at [tex]T_{3}[/tex] = 25° , [tex]P_{3}[/tex] = 0.8 MPa =8 bar
At -20°C, [tex]hf_{4}[/tex] = 173.6 KJ/Kg
[tex]hg_{4}[/tex] = 386.6 KJ/Kg
[tex]h_{4} = hf_{3} + n_{4} ( hg_{4} - hf_{4} )[/tex] = 234.49
173.6 + [tex]n_{4}[/tex] [386.6 - 173.6] = 234.49
[tex]n_{4}[/tex] = 0.285
[tex]P_{4} = P_{1} = P_{sat}[/tex] = 1.3273 bar = 0.1327 MPa
2.)
Exit specific internal energy, using table R-134a
[tex]U_{4} = uf_{4} + n_{4} (ug_{4} - uf_{4} )[/tex]
at -20°c, [tex]uf_{4}\\[/tex] = 173.65, ufg = 192.85 KJ/ Kg
[tex]U_{4}[/tex] = 173.65 + 0.285 (192.85)
[tex]U_{4}[/tex] = 228.61 KJ/Kg
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Related Questions
4.5% complete Question Select the methods of containment based on the concept of isolation. (Select all that apply.) A.Blackhole B.Sinkhole C.Physical disconnection/air gapping D.Sandboxing
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Answer:
A. Blackhole
C. Physical disconnection/air gapping
D. Sandboxing
Here are the methods of containment based on the concept of isolation:
Physical disconnection/air gapping is the most effective method of isolation, separating the infected system from the rest of the network.
How does sandoxing work?Sandboxing isolates the infected system in a controlled environment, allowing analysis and cleaning without affecting the rest of the network. Quarantine isolates the infected system from the rest of the network until it can be cleaned, preventing it from infecting other systems.
The following methods are not based on the concept of isolation:
Blackhole: This is a method of redirecting malicious traffic to a dead end. This does not isolate the infected system, but it does prevent the malicious traffic from reaching other systems on the network.
Sinkhole: This is a method of redirecting malicious traffic to a honeypot. This does not isolate the infected system, but it does allow security researchers to collect information about the malicious traffic.
Therefore, the methods of containment based on the concept of isolation are Physical disconnection/air gapping, Sandboxing, and Quarantine.
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when electric power is transmitted over long distance, line losses can be reduced by generating AC rather than DC voltage and by transmitting?
Answers
When electric power is transferred over a long distance then, line loss can be reduced by high voltage and low current. Thus, option A is correct.
What is electric power?The complete question is attached to the image below.
The electric circuit transfers the electric current then it is called electric power. The loss in the line over a larger distance is reduced by transferring AC instead of DC voltage.
The AC transmitted is of high voltage, and the power is low. The equation for current is given,
P = VI
The increase in the voltage causes the decrease in the current and in turn the resistance also reduces resulting in the loss of the power of the circuit to decrease.
Therefore, the loss is reduced by transferring high voltage and, low current AC.
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How many gyros and how many accelerometers are in the INS?
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The number of gyros and accelerometers that are in the INS are three (3) gyros and two (2) accelerometers respectively.
What is INS?INS is abbreviation for Inertial Navigation System and it can be defined as a navigation device that is designed and developed to use motion sensors, a computer, and rotation sensors, so as to continuously calculate by dead reckoning the velocity, position, and orientation of a moving object.
Based on scientific information and records, the number of gyros and accelerometers that are in the INS are three (3) gyros and two (2) accelerometers respectively.
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A feature control frame must be connected to
Answers
Answer:
Surface Parallelism When a surface is to be parallel to a datum plane, the feature control frame is connected by a leader to the surface, or to an extension line from the surface.
Explanation:
In a basketball game, the point guard A intends to
throw a pass to the shooting guard B, who is breaking
toward the basket at a constant speed of 12 ft /sec. If
the shooting guard is to catch the ball at a height
of 7 ft at C while in full stride to execute a layup,
determine the speed v0 and launch angle with
which the point guard should throw the ball
Answers
In a basketball game, point guard A intends the speed as 47.76 ft/sec, and the launch angle will be 41.084°.
What is the projectile motion?The projectile motion is given as the motion of the object in the curved path near the earth's surface. The throwing of the ball will follow the projectile motion.
The missing image is attached below.
The given game situation consists of:
Velocity of shooting guard (vs) = 12 ft/sec.
Distance from B to C (sc) = 20 ft
Final height to catch the ball, 7 ft
The total distance to cover from B to C = 60 ft
Time is taken to reach B to C = Distance/Speed
Time to reach B to C = 20ft/12ft/sec
Time to reach B to C = 1.667 sec.
The time taken to cover the horizontal distance:
Distance = Velocity * Time
60³ = v₀cosθ * distance/time
60³ = v₀cosθ * 20/12
v₀cosθ = 36 ft/sec
The vertical movement can be given where, g = 32.2 ft/sec²:
s = s₀ + v₀sinθ * time + 1/2 -g time²
7 = s + v₀sinθ * 20/12 - 1/2 32.2 ft/sec² * (20/12)²
v₀sinθ = 31.3875 ft/sec
[tex]\rm v_0 =\sqrt{v_0sin\theta^2\;+\;v_ocos\theta^2}[/tex]
Substituting the values:
v₀ = 47.76 ft/sec
The launch angle for the ball will be:
tanθ = v₀sinθ/v₀cosθ
tanθ = 31.3875/36
tanθ = 0.871
θ = 41.084°
Thus, the speed v₀ of the ball will be 47.76 ft/sec, and the launch angle will be 41.084°.
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The A/C compressor will not engage when the A/C is turned on. The static refrigerant pressure is 75 psi and the outside temperature is 72 degrees F. Technician A says that a poor connection at the pressure cycling switch could be the cause. Technician B says that a faulty A/C clutch coil could be the cause. Who is correct
Answers
In the case above, poor connection at the pressure cycling switch and also a faulty A/C clutch coil could be the cause.
What is likely the reason when an A/C compressor will not engage if A/C is turned on?The cause that hinders the A/C Compressor from engaging are:
Due to low pressure lockout.Due to a poor groundDue to bad clutch coil.Dur to an opening in the wire that links to the clutch coil.Due to a blown fuse.Note that the pressure switches is known to be one that control the on/off function of any kind of AC compressor and as such, if there is switch failure, it can hinder the AC compressor from functioning at all.
Therefore, technician A and B are correct.
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he minimum number of branch circuits is determined from ____ load and the size (or rating) of the circuits used.
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The minimum number of branch circuits is determined from the total computed load and the size (or rating) of the circuits used.
What is circuit?It should be noted that circuit means a complete circular path that electricity flows through.
In this case, the minimum number of branch circuits is determined from the total computed load and the size (or rating) of the circuits used.
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The following is a dump of a udp header in hexadecimal format. 0632000d 001ce217 a. what is the source port number? b. what is the destination port number? c. what is the total length of the user datagram? d. what is the length of the data? e. is the packet directed from a client to a server or vice versa? f. what is the client process?
Answers
The source port number of the dump given above is 1586. The destination port number is given below.
What is the destination port number?The destination port number is given as 000DH = 13. Destination port number is determined by running the following command in the Command Prompt: netstat-a
Then you hit the enter button.
What is the total length of the user datagram?The total length of the datagram is given as 001CH = 28 bytes. Datagram is a form of message that is self-contained, that is relayed over the network. It must be noted that it's content cannot be guaranteed.
What is the length of the data?The length of the data is 20 bytes. This is arrived at by computing the following:
Data Lenght - Header
= 28 - 8
= 20bytes.
Is the packet directed from a client to a server or vice versa?
It is to be noted that the packet is directed from the client to the sever.
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If the digital inputs for a supply-air fan control application indicate that the supply-air fan should be on, the controller compares the measured ________ to the set point; if this reading is lower than the setpoint, the supply-air fan speed must be increased.
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If the digital inputs for a supply-air fan control application show that the supply-air fan should be ON, the controller compares the measured static air pressure to the set point.
The operation of a supply-air fan control.Basically, the controller of a supply-air fan control application is designed and developed to compare the measured static air pressure to the set point when its digital inputs indicate that the supply-air fan should be ON.
By design and configuration, if the measurement of the static air pressure is lower than the set point, the supply-air fan speed must be increased by an engineer accordingly.
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Tech A says that on the full floating axle, there are two tapered roller bearings between the hub and the outside of the axle housing. Tech B says that a semi-floating axle, the axle supports the weight of the vehicle and is also subject to bending forces as the vehicle corners. Who is correct
Answers
The information depicted shows that both technicians are correct.
Who is a technician?This is an individual who overlooks the technical equipment in an organization.
In this case, on the full floating axle, there are two tapered roller bearings between the hub and the outside of the axle housing.
Also in a semi-floating axle, the axle supports the weight of the vehicle and is also subject to bending forces as the vehicle corners.
Therefore, they're both correct.
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Design a driver circuit that should drive a a seven segment to display octal numbers
[0 up to 7]. Your work should include the following steps
1) An appropriate title
2) The truth Table
3) Simplified expressions for the appropriate circuit
4) Logical circuit for the driver.
Answers
Answer:
point hehe sorry sorry
Explanation:
I don't know
an incorrect way of handling disposable gloves includes
Answers
The incorrect way of handling disposable gloves are as follows;
Blow into themHold them by the fingersRoll them onto the handsWhat are disposable gloves?Disposable gloves are gloves that you use one time and then throw away.
They are usually transparent and made of nitrile, latex, or vinyl.
They are usually tough to withstand liquids and chemicals.
Therefore, the incorrect way of handling them includes the following;
Blow into themHold them by the fingersRoll them onto the handslearn more on disposable gloves here: https://brainly.com/question/24012826
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Directions: Correct the errors.
to
1. I went to the library for study last night.
2. Helen borrowed my dictionary for to look up the spelling of "occurred."
3. The teacher opened the window for letting some fresh air in the room.
4. I came to this school for learn English.
5. I traveled to Osaka for to visit my sister.
Answers
Answer:
1. I went to the library to study last night.
2.Helen borrowed my dictionary to look up the spelling of "occurred."
3.The teacher opened the window to let some fresh air into the room.
4..I came to this school to learn English.
5.I traveled to Osaka to visit my sister.
Explanation:
...
Which thematic group is involved in the transmission and generation of electrical power?
a.Communication Systems
b.Control Systems
c.Computer Systems
d.Energy Systems
e.Electronic Systems
Answers
Answer:
The 17 distinct years Mariah Carey has topped Billboard's Hot 100, spanning an historic four consecutive decades:
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2005
2006
2008
2019
2020
2021
An Exterior Insulation Finish System (EIFS) shall terminate a minimum ___________ inches above the finished ground level.
Answers
Answer:
An Exterior Insulation Finish System (EIFS) shall terminate a minimum 6 inches above the finished ground level.
Before installing head gaskets look for “____” labels on the head gaskets
Answers
Before installing head gaskets, you should look for "this side up" or "front" labels on the head gaskets.
What is a head gasket?A head gasket can be defined as a gasket which is fitted between the engine block and the cylinder head in an internal combustion engine, so as to seal oil passages and absorb the pressures of the combustion that occurs inside the engine.
As a general rule, you should look for "this side up" or "front" labels on the head gaskets before installing head gaskets in an internal combustion engine of a vehicle.
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Check the level of motor oil in your engine by ?
Answers
Answer:
cpct gvxjjxjhdfjokjdzfjiyddzzsjhxf
3 To improve the acoustics in auditorium, a sound reflector with mass
of 200 kg is suspended by a chain from the ceiling. What is its
weight? What force (magnitude and direction) does the chain exert
on it? What is the tension in the chain? Assume that the mass of the
chain itself is negligible.
Answers
To improve the acoustics in auditorium, a sound reflector with mass of 200 kg is suspended by a chain from the ceiling thus thet force (magnitude and direction) does the chain exert on it =1960 N.
What is Newton's third regulation?
Ths 0.33 regulation states that for each movement (pressure) in nature there's an identical and contrary response. If item A exerts a pressure on item B, item B additionally exerts an identical and contrary pressure on item A. In different words, forces end result from interactions.
Weight of reflector = mg=200^ * 9.8=1960 NForce exerted with the aid of using chain =1960 NDirection = upwardsTension at the chain = weight of reflector=1960 NWeight of reflector =mg =100 * 9.8=980NMagniyof pressure reflector exerts on earth = 980 N(Due to movement response pair of forces, consistent with Newton's 0.33 regulation of motion.Read more about the Newton's law:
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When adding two 8 bit binary numbers, which of the following statements is true?
Answers
Answer:
The result might require 9 bits to store
Draw isometric projection of a pls help
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Draw isometric projection Spatial axes of the item are represented as similarly willing to the drawing floor and same distances alongside the axes are drawn the same.
What is isometric projection?Definition of isometric projection an axonometric projection wherein the 3 spatial axes of the item are represented as similarly willing to the drawing floor and same distances alongside the axes are drawn same.
An isometric view of an item may be received via way of means of selecting the viewing path such that the angles among the projections of the x, y, and z axes are all of the same, or 120°. For example, with a cube, that is achieved via way of means of first searching immediately toward one face.
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3. You were given the opportunity to be a project manager for Apple to work on a new product. Provide me with details on what that product is ( you make it up ), how will you approach the work and find resources for it.
Answers
You were given the opportunity to be a project manager for Apple to work on a new product by Product control examples additionally consist of the branding and consumer conversation.
What makes you a very good mission supervisor?Good mission managers recognize and recognize their marketplace and the enterprise in their projects. They look at the opposition and compare alternatives. A desirable mission supervisor remains updated at the brand new developments withinside the enterprise in their mission, and they show off a stable knowledge and know-how in their enterprise.
Product control examples additionally consist of the branding and consumer conversation required to release a brand new product. Each product, in its nascent form, calls for right branding. This creates recognition approximately the product withinside the marketplace. Advertising and PR managing additionally fall beneath neath the umbrella of product control.
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When what is visible to end-users is a deviation from the specific or expected behavior, this is called:
Answers
When what is visible to end-users is a deviation from the specific or expected behavior, it's an error.
What is an error?It should be noted that an error means a deviation from what's expected by an individual or programmer.
In this case, when what is visible to end-users is a deviation from the specific or expected behavior, it's an error. This is a deviation.
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Which of the following is a slow rise of plastic deformation under the action of shear stresses when it is below the yield strength of the material.
a.Brittle Structure
b.Ductile fracture
c.Creep
d.Fatigue
Answers
Creep can be described as a process of the slow rise of plastic deformation under the action of shear stresses when it is below the yield strength of the material. Hence, Option C is correct.
What do you mean by permanent deformation?Permanent deformation can be defined as irreversible, the deformation remains even after the elimination of the carried out forces, at the same time as the transient deformation is recoverable because it disappears after the elimination of carried out forces.
therefore, the correct statement is Option C.
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Technician A uses heat shrink tubing to insulate and seal soldered wire connections. Technician B wraps the soldered connection with electrical tape. Who is correct
Answers
The technician that's correct is Technician A.
Who is a technician?A technician is an individual that's employed to look after the technical equipments in an organization.
In this case, Technician A uses heat shrink tubing to insulate and seal soldered wire connections. He is correct.
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Please show NEC article 310.10(H)
Answers
Conductors in Parallel is covered in 310.10(H). Often when working with higher ampacities, we find it to be cumbersome and expensive to keep increasing the size of the wire and conduit. The solution is often to use multiple runs that are connected to a common location on each end. Notice in the 2011 edition of the code that much of this section is highlighted gray, indicating new or revised text. The change here was that the previous code stated that you were permitted to parallel conductors 1/0 AWG and larger; however, it didn’t specifically prohibit you from paralleling smaller conductors, which was the intent and the way it was enforced in all my years of enforcement. However, that’s not what the actual language said, and ambiguous language cancause enforcement issues; therefore, in the 2011 code it was made clear that you are only allowed to parallel conductors 1/0 AWG and larger.
Why can’t we find all errors before we give the software to our customers?
Answers
Explanation:
what is protozoa define it with diagram srt-nhev-mvp
i m n * de
Tech A says that if a CV boot is torn, it can typically be replaced without replacing the entire joint or shaft. Tech B says that worn CV joints can make a clicking noise when driving while making a tight turn. Who is correct
Answers
Both Technician A and Technician B are correct based on the information provided.
When to replace a CV boot?The CV boot on an automobile vehicle should be replaced when it is torn but shouldn't have been torn for too long. Thus, you should just replace the boot when the CV joint is not yet completely damaged or full of dirt.
Similarly, worn CV joints in an automobile vehicle can make a clicking noise when driving while making a tight turn on a road.
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What is the first test you should do when checking the charging system?
Answers
Answer:
Connect the test light in series with the negative post, and start pulling feed wires. The first to check is the heavy charging wire from the alternator. A bad or leaky diode in an alternator is a very common source of overnight battery drain. Connect wires one at a time to see what lead is drawing current.
Where a solid wood door is installed as a permitted opening between a garage and a residence, the minimum thickness of the door shallbe __________ inches.
Answers
For a garage and a residence, the minimum thickness of a solid wood door that is installed as a permitted opening shall be 1 3/8 inches.
What is a door?A door can be defined as a solid material made of wood or metal, which is designed and developed to facilitate entrance and exit out of a building.
According to the International Residential Code (IRC), the minimum thickness of a solid wood door that is installed as a permitted opening for a garage and a residence shall be 1 3/8 inches.
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Technician A says that mechanical shifting controls can wear out over time. Technician B says that vacuum control rubber diaphragms can deteriorate over time. Who is correct
Answers
Based on the information, both technician A and technician B are correct.
How to depict the information?From the information given, Technician A says that mechanical shifting controls can wear out over time.
Technician B says that vacuum control rubber diaphragms can deteriorate over time.
In this case, both technicians are correct as the information depicted is true.
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