It is given that the mass flow rate of the refrigerant is 10 kg/s and the vapour compression process is assumed to be isentropic with a compressor efficiency of 100%.
So, the specific work done in the compressor (W comp) is given by, Wcomp = h2 - h1 = 287.0 - 259.3 = 27.7 kJ/kgThe refrigeration effect (Qin) is given by, Qin = m x (h1 - h4) = 10 x (259.3 - 106.1) = 1532 kJ/s The cooling capacity of the chiller is given by, Qout = Qin = 1532 kJ/s The COP of the chiller is given by, COP = Qin / W comp = 1532 / 27.7 = 55.27(b) (i) The sensible cooling load (Qs) and the total cooling load (Qt) of the office can be calculated as follows:
The density of air is 1.2 kg/m3, the specific heat capacity of air is 1.02 kJ/kgo C, and the volume flow rate of the return air is 20 m3/s, and the temperature of the return air is 25oC.So, the sensible cooling load is given by, Qs = m x Cp x (Tr - T) x 3600= 1.2 x 1.02 x (25 - 13) x 20 x 3600= 11.59 MW The humidity ratio of the mixed air can be calculated as follows: wx = (m1 x w1 + m2 x w2) / (m1 + m2)= (20 x 0.01 + 5 x 0.0076) / (20 + 5)= 0.00906 kg/kg dry air Using a psychrometric chart, the enthalpy of the mixed air can be found to be 41.7 kJ/kg dry air.
To know more about refrigerant visit:-
https://brainly.com/question/33292000
#SPJ11
What should you do before you start welding?
Explanation:
1. Weld only in authorized areas. Make sure the area is dry, chemical free, and well ventilated.
2. Inspect the equipment before starting to use it.
3. Keep other people away, unless they are authorized to be there and are wearing the appropriate personal protective equipment.
Mimo antenna systems intentionally takes advantage of multipath using spatially diversified transmit and receive antennas, and digital signal processors (dsps).
a. True
b. False
Option a is correct. It is true that MIMO antenna systems intentionally takes advantage of multipath using spatially diversified transmit and receive antennas, and digital signal processors (dsps).
Multiple antennas are utilized at both the source (transmitter) and the destination in wireless communications known as MIMO (multiple input, multiple output) (receiver). By letting data to travel through several signal pathways simultaneously, the antennas at either end of the communications circuit are merged to reduce mistakes, improve data speed, and increase the capacity of radio transmissions.
The data has a greater chance of reaching the receiving antenna unaffected by fading when numerous versions of the same signal are created, which improves the signal-to-noise ratio and error rate. MIMO improves radio frequency (RF) system capacity, resulting in a more dependable connection and less congestion.
To know more about MIMO click on the link:
https://brainly.com/question/27506172
#SPJ4
It is true that Mimo antenna systems intentionally takes advantage of multipath using spatially diversified transmit and receive antennas, and digital signal processors (dsps).
To know more about dsps click here :
https://brainly.com/question/28902949
#1234
Which step in the reverse-engineering process involves the identification of subsystems and their relationship to one another?
The answer is analyze
I have 5 apples and i ate 4. how many apple i have?
Answer:
I think you have 5 apples because I don’t think you said you even had any.
Explanation:
I think you would have 5 left.
A solenoid of radius 4.5 cm has 800 turns and a length of 25 cm.
(a) Find its inductance.
Apply the expression for the inductance of a solenoid. mH
(b) Find the rate at which current must change through it to produce an emf of 70 mV. (Enter the magnitude.)
The inductance of the solenoid is 1.01 mH, and the rate at which current must change through it to produce an EMF of 70 mV is 69.31 A/s.
Radius of solenoid (r) = 4.5 cmNumber of turns (N) = 800Length of solenoid (l) = 25 cmEMF (e) = 70 mV
(a) To find the inductance of the solenoid, we use the expression: L = (μ₀×N²×A)/l where,
μ₀ = 4π×10⁻⁷ T.m/A
N = 800 turnsl = 25 cm = 0.25 mA = πr² = 3.14×(4.5 cm)² = 63.585 cm² = 63.585×10⁻⁴ m²
L = (4π×10⁻⁷×800²×63.585×10⁻⁴)/0.25L = 1.01 mH
Thus, the inductance of the solenoid is 1.01 mH.
(b) To find the rate of change of current, we use the formula: e = - L × (di/dt) where,
e = 70 mV,
L = 1.01 mH
We need to find the magnitude of (di/dt)
The above formula can be written as:(di/dt) = - e/L
We substitute the given values to find (di/dt) (di/dt) = -(70×10⁻³ V)/(1.01×10⁻³ H)(di/dt) = - 69.31 A/s
Thus, the rate at which current must change through it to produce an EMF of 70 mV is 69.31 A/s (magnitude only). Therefore, the answer is: 1.01 mH, 69.31 A/s
Learn more about The inductance: brainly.com/question/29462791
#SPJ11
The yield strength for an alloy that has an average grain diameter, d1, is listed above as Yield Stress 1 . At a grain diameter of d2, the yield strength increases Yield Stress 2. At what grain diameter, in mm, will the yield strength be 217 MPa
Complete Question:
Grain diameter 1 (mm) = 4.4E-02
Yield stress 1 (MPa) = 131
Grain diameter 2 (mm) = 7.7E-03
Yield Stress 2 (MPa) = 268
The yield strength for an alloy that has an average grain diameter, d1, is listed above as Yield Stress 1 . At a grain diameter of d2, the yield strength increases Yield Stress 2. At what grain diameter, in mm, will the yield strength be 217 MPa
Answer:
d = 1.3 * 10⁻² m
Explanation:
According to the Hall Petch equation:
\(\sigma_y = \sigma_0 + k/\sqrt{d} \\\)
At \(d_{1} = 4.4 * 10^{-2} mm\), \(\sigma_{y1} = 131 MPa = 131 N/ mm^2\)
\(131 = \sigma_0 + k/\sqrt{4.4 * 10^{-2}} \\k = 27.45 - 0.2096 \sigma_0\)
At \(d_{2} = 7.7 * 10^{-3} mm\), \(\sigma_{y2} = 131 MPa = 268 N/ mm^2\)
\(268 = \sigma_0 + (27.45 - 0.2096 \sigma_0)/\sqrt{7.7 * 10^{-3}} \\23.5036 = 27.47 - 0.1219 \sigma_0\\ \sigma_0 = 32.45 N/mm^2\)
k = 27.45 - 0.2096(32.45)
k = 20.64
At \(\sigma_y = 217 MPa\), reapplying Hall Petch law:
\(\sigma_y = \sigma_0 + k/\sqrt{d} \\\)
\(217 =32.45 + 20.64/\sqrt{d} \\217 - 32.45 = 20.64/\sqrt{d}\\184.55 = 20.64/ \sqrt{d} \\\sqrt{d} = 20.64/184.55\\\sqrt{d} = 0.11184\\d = 0.013 mm\)
d = 1.3 * 10⁻² m
If an overloaded << or >> operator accesses a private member of a class, what must be done in that class's declaration?
If an overloaded << or >> operator accesses a private member of a class, the member function needs to be declared as a friend of the class in order to access its private members. This can be done by including a friend declaration for the operator function inside the class definition.
This indicates that only classes belonging to the same package will be able to access it. It is also known as package-private access or default access. Classes or members that must be accessed by other classes within the same package but not outside of it can benefit from package access. It enables better code organisation and encapsulation.
A member or class has public access when it can be accessed by any other class in any package. A member or class has private access when only the class in which it is declared may access it.
Package access provides some encapsulation and protection overall while yet enabling some flexibility in accessing the member or class within the same package.
Learn more about private member here
https://brainly.com/question/31536480
#SPJ11
Describe the extent of their own responsibility. When to act on their own innitiative to find , clarify and evaluate information , and to whom they should report if they have problems they cannot resolve in the work place
Answer:
whatsthe question choices
What was frank lloyd wright's term for the homes he designed such as the robie house, which had an open ground plan and long, ground-hugging lines?
Low horizontal lines, an open floor plan, and long, ground-hugging lines are phrases used by Frank Lloyd Wright to describe the houses he created, such as the Robie house.
Who is Frank Lloyd?Frank Lloyd Wright was an American architect, designer, author, and educator who lived from June 8, 1867, until April 9, 1959. Over the course of his 70-year creative career, he created more than 1,000 structures. Wright was a significant contributor to the twentieth-century architectural trends, inspiring thousands of apprentices through his Taliesin Fellowship and through his works. Wright adhered to an aesthetic he dubbed "organic architecture," which he described as harmonious design with both people and the environment.Fallingwater (1935), dubbed "the best all-time achievement of American architecture," served as an example of this idea.To learn more about frank Lloyd, refer to:
https://brainly.com/question/24196635
#SPJ4
Explain Why programs when are developed using evolutionary development are likely to be difficult to maintain
Answer:
When a system is produced using the evolutionary development model, features tend to be added without regard to an overriding design. With each modification, the software becomes increasingly disorganized. System maintenance hampered by these problems, as it is harder identifying the source of bugs in poorly designed systems. Also, keeping the documentation up to date over successive "evolution" is uncommon. Poor documentation also makes maintenance more difficult.
Explanation:
・It leads to implementing and then repairing way of building systems.
・Practically, this methodology may increase the complexity of the system as scope of the system may expand beyond original plans.
・Incomplete application may cause application not to be used as the full system was designed.
・Their results have incomplete or inadequate problem analysis.
A defective crankshaft position sensor is a common cause of a no-start condition.
Group of answer choices
Answer:
Switching on and off
Explanation:
No starters are often caused by a faulty crankshaft actuator. The signals from this transmitter is sent to the ignition module, which turns in and out of the ignition system. If you already have an RPM sign, it's possible that a faulty ignition unit or PCM isn't turning the coils on and off. Along with button on and the motor cranking, testing for volts at the contacts with a voltmeter.
Help please!
Find two careers and explain why you would enjoy being in this career field.
Find two careers and explain why you would NOT enjoy being in this career field.
Note: You should have at least TWO paragraphs
An aircraft component is made from a material has .It has been determined that fracture results at a stress of when the maximum (critical) internal crack length is . For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of . chegg
Therefore, the stress level at which fracture will occur for a critical internal crack length of 5 mm is approximately 22.53 MPa.
To compute the stress level at which fracture will occur for a critical internal crack length of "c2," we can use the formula for stress intensity factor:
K = Y * σ * √(π * c)
Where:
K is the stress intensity factor
Y is the geometric factor (typically assumed to be 1 for internal cracks)
σ is the applied stress
c is the crack length
We can rearrange the formula to solve for the stress (σ):
σ = K / (Y * √(π * c))
Given the values:
Stress at fracture (σ1) = 100 MPa
Critical internal crack length (c1) = 1 mm
New critical internal crack length (c2) = 5 mm
Let's calculate the stress level (σ2) for the new critical crack length:
σ2 = (100 MPa) / (1 * √(π * 5 mm))
= 100 MPa / (√(15.71 mm))
≈ 22.53 MPa
Learn more about length here
https://brainly.com/question/2497593
#SPJ11
based on your understanding of how the fsm system works, which of the following are examples of a finite machine system? combinational locks control mechanism of elevator digital watches traffic light
A Mealy machine alters its output in accordance with its input and status at the time. The output of a Moore Machine can only be determined by its current condition.
The current input is unrelated to it. Mealy and Moore State Machine construction takes place in Verilog. FSM definition Mealy and Moore State Machine construction takes place in Verilog. FSM definition A type of computer model known as a finite state machine, or FSM, simulates or explains sequential logic. What results from a Moore FSM? The current environment is the only element affecting the results of Moore FSM. Along with the current state, the current input also has an impact on the outputs. Mealy and Moore FSM share the same fundamental structure. To do this with a Finite State Machine controller, three states are required (3). In a finite state machine, only one state or event can happen at once.
Learn more about Moore FSM here:
https://brainly.com/question/29990464
#SPJ4
Hey guys can anyone list chemical engineering advancement that has been discovered within the past 20 years
when electric power is transmitted over long distance, line losses can be reduced by generating AC rather than DC voltage and by transmitting?
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.
Learn more about high volatge AC here:
https://brainly.com/question/18069892
#SPJ1
What does efficiency measure?
Answer:
Efficiency is defined as any performance that uses the fewest number of inputs to produce the greatest number of outputs. Simply put, you're efficient if you get more out of less.
Explanation:
A steam boiler is used to heat the paper dryers in a paper mill. The boiler is located outside of the building. The steam pipes are insulated to keep the steam hot until it reaches the paper machine. Condensate is returned to the boiler in a separate line.
One winter, the paper mill decides to shut down the machine for a week during the holidays. The weather is very cold outside.
What should you do to prepare the boiler before leaving for the holidays?
A. Open Valve A to let the steam escape.
B. Open Valve B to shut off the condensate line.
C. Open Valve C to drain the condensate line.
D. Open Valve D to drain the boiler.
You should open Valve C to drain the condensate line to prepare the boiler before leaving for the holidays. The correct option is c.
What is a steam boiler?An energy-producing steam boiler heats water to produce steam, which in turn generates energy. To heat water, a steam boiler burns fuel. Steam is created when heat and water are combined.
The design, portability, tube types, fuel types, and pressure that steam boilers create define them. Since steam is gas, it fills the whole roll and disperses heat evenly when it condenses.
Therefore, the correct option is C. Open Valve C to drain the condensate line.
To learn more about steam boilers, refer to the link:
https://brainly.com/question/14280373
#SPJ1
A vibration system consists of a mass 50 kg, a spring of stiffness 30 kN/m and a damper. The
damping provided is only 20% of the critical value. Determine (a) the damping factor, (b) the
critical damping coefficient, (c) the natural frequency of the damped vibrations, (d) the
logarithmic decrement and (e) the ratio of two consecutive amplitudes.
Answer:
20% of the critical value. Determine (a) the damping factor, (b) the
Explanation:
Which of the following is correct?
A. Analog signals are either high-low, on-off, or yes-no.
B. Digital signals are infinitely variable within a defined range.
C. All of the above.
D. None of the above.
Signals containing information often come in the form of analogue and digital signals. The primary distinction between the two signals is that analogue signals have continuously varying electrical signals, but digital signals do not.so, optionD, none of these is the correct answer .
Many systems produced information-carrying signals using analogue signals. These signals are continuous in both values and timing. Analog signals are less frequently used now that digital signals are available. Analog signals, to put it simply, are any signals produced naturally or found in nature.more info on waves. What Processes Digital Signals?Unlike analogue signals, digital signals are discrete in both value and time.These signals, which are made up of various voltage values, are represented by binary numbers. Signal differences between analogue and digitalIn order to summarize, we have provided a table below that lists the key distinctions between analogue and digital signals. Information is transferred via both of these signals in electronic communication systems.
To learn more about " analogue " Click on below link
brainly.com/question/22058326
#SPJ4
The quality control engineer at a petrochemical refinery is in a _____ position.
The quality control engineer at a petrochemical refinery is in a matrix position.
Who is an engineer?An engineer can be defined as a person who solves technical problems which are related to a product or a good. These are also engaged in developing new products full of the improvement of the efficiency and quality of the product.
A matrix's profile is determined by the object's row and column numbers, in that order.
Petrochemicals are indeed the chemical byproducts of the processing of gasoline. Some petroleum-derived chemical compounds can also be produced from these other oil and coal.
Learn more about engineer, here:
https://brainly.com/question/27222435
#SPJ1
what is the manufacturer-specific id for the gemtek radio transmitter/receiver?
The manufacturer-specific ID for the Gemtek radio transmitter/receiver refers to a unique identifier assigned by Gemtek to each of their radio communication devices.
This ID allows customers, service providers, and the manufacturer to identify a specific unit and gather relevant information about its specifications, production batch, and technical support.
To find the manufacturer-specific ID for your Gemtek radio transmitter/receiver, follow these steps:
1. Locate the product label: Find the label on your device, usually on the back or bottom panel. It may contain information such as the model number, serial number, and manufacturer-specific ID.
2. Look for the ID: On the label, search for a series of numbers or letters that represent the manufacturer-specific ID. It may be labeled as "ID," "Product ID," or "Unique ID."
3. Note the ID: Write down or take a photo of the ID for future reference when contacting support or seeking technical information.
If you are unable to find the manufacturer-specific ID, consider reaching out to Gemtek's customer support with your device's model number and serial number. They can help you identify the correct ID for your radio transmitter/receiver.
To know more about radio communication devices visit:
https://brainly.com/question/31781423
#SPJ11
MARKING BRAINLIEST
What is a good prototype plan?
Answer:
The plan is to make your design on AutoCAD and then make technical drawings. Print those technical drawings out with a scale of 1:1 and use those to trace over wood or metal.
Explanation:
Answer:
Make your design, make technical drawings, 3D print or trace
Explanation:
R-134a at 320 kPa and 40 C undergoes an isothermal process in a closed system until its quality is 45 percent. determine how much work and heat transfer are required per mass.
The system's temperature is maintained constant using an isothermal process, which is a type of thermodynamic process. Thermal equilibrium is maintained because heat is introduced or removed from the system so gradually.
What heat transfer required per mass in isothermal process?Any isothermal process must have zero change in internal energy since the change in internal energy depends on the change in temperature, which is zero for all isothermal processes.
Since the temperature is kept constant, the energy change is zero (U=0). Thus, the work that the ideal gas does on its surroundings is equal to the heat that the gas absorbs.
Therefore, In a closed system, refrigerant-134a undergoes an isothermal procedure at 320 kPa and 40 °C until its quality reaches 45%. Determine the effort and heat transfer needed on a per-unit-mass basis. 2: 40.6 kJ/kg and 130 kJ/kg.
Learn more about isothermal process here:
https://brainly.com/question/12023162
#SPJ1
A homeowner consumes 260 kWh of energy in July when the family is on vacation most of the time. Determine the average cost per kWh for the month using the following residential rate schedule: Base monthly charge of $10.00. First 100 kWh per month at 16 cents/kWh. Next 200 kWh per month at 10 cents/kWh. Over 300 kWh per month at 6 cents/kWh.
Answer:
16.2 cents
Explanation:
Given that a homeowner consumes 260 kWh of energy in July when the family is on vacation most of the time.
Where Base monthly charge of $10.00. First 100 kWh per month at 16 cents/kWh. Next 200 kWh per month at 10 cents/kWh. Over 300 kWh per month at 6 cents/kWh.
For the first 100 kWh:
16 cent × 100 = 1600 cents = 16 dollars
Since 1 dollar = 100 cents
For the remaining energy:
260 - 100 = 160 kwh
10 cents × 160 = 1600 cents = 16 dollars
The total cost = 10 + 16 + 16 = 42 dollars
Note that the base monthly of 10 dollars is added.
The cost of 260 kWh of energy consumption in July is 42 dollars
To determine the average cost per kWh for the month of July, divide the total cost by the total energy consumed.
That is, 42 / 260 = 0.1615 dollars
Convert it to cents by multiplying the result by 100.
0.1615 × 100 = 16.15 cents
Approximately 16.2 cents
How can you throw a ball as hard as you can and have it come back to you, even if it doesn't
bounce off anything? There is nothing attached to it, and no one else catches or throws it back to
you.
Answer:
Magic
Explanation:
magic is the answer to everything unexplainable
explain why clay having been fired
at elevated temperature Loses its
hydroplasticity.
Firing clay at elevated temperatures causes it to lose its hydro plasticity by removing the water molecules that allow the particles to move and slide past each other. This results in a more rigid and durable material that is suitable for various applications.
What is Clay?Clay is a naturally occurring material composed of fine particles of minerals such as kaolinite, illite, and montmorillonite.
One of the unique properties of clay is its hydroplasticity, which refers to its ability to change shape and form when it comes into contact with water.
When clay is wet, the water molecules fill the spaces between the clay particles, allowing them to slide past each other and become more pliable. This allows the clay to be easily molded into various shapes and forms.
However, when clay is fired at elevated temperatures, the heat causes the water molecules to evaporate, leaving behind a solid mass of mineral particles. The heat also causes the minerals to undergo chemical changes, resulting in the formation of new bonds and the strengthening of existing bonds between the particles.
Read more about hydroplasticity here:
https://brainly.com/question/29345097
#SPJ1
Match the words in the left column to the appropriate blanks in the sentences on the right. Note that some words may be used more than once and some may not be used.
1. breaking
2. forming
3. positive
4. negative
5. twice
6. half
A. The reaction involves___five blue-blue and twenty blue-red bonds and then____twenty blue-red bonds. Enthalpies for bond breaking are always_____.
B. In the depicted reaction, both reactants and products are assumed to be in the gas phase. There are___as many molecules of in the products, delta S is___for this reaction
Answer:
A. Breaking; forming; positive.
B. Twice; half.
Explanation:
A. The reaction involves breaking five blue-blue and twenty blue-red bonds and then forming twenty blue-red bonds. Enthalpies for bond breaking are always positive.
B. In the depicted reaction, both reactants and products are assumed to be in the gas phase. There are twice as many molecules of gas in the products, delta S is half for this reaction.
Bond enthalpy refers to the amount of energy that is required to break a mole of a particular bond and it's an endothermic reaction, therefore it is always positive.
However, bond forming is always an exothermic reaction because energy is released, therefore, it is always negative. This simply means that, the breaking of a bond is an endothermic reaction (positive) while the formation of a bond is an exothermic reaction (negative).
Sample 102-1s was taken at a depth of 5 centimeters beneath the surface of the soil. all sterile handling techniques were followed per operational procedures in section 5-3a. molecular isolation techniques identified six molecules for evaluation. these have been downloaded into canvas for your analysis. further chemical analysis of the sample conducted as part of the extraction process yielded the following information: all elements in the sample appear to be composed of protons, neutrons and electrons. all elements in the sample, isolated outside of their constituent molecules, are electrically neutral.
Collecting samples for DNA analysis from blood or other bodily fluids. DNA extraction is the process of opening up cells using heat or chemicals to release the DNA.
Purification of the sample through separation of cellular waste and other contaminants from the DNA. Establishing whether the sample is adequate for analysis — quantification employing the polymer chain reaction (PCR) to electrically order the fragment amplification while copying the DNA. The following are the steps involved in isolating and purifying DNA: sample gathering, extraction of DNA, and cleaning of the sample. DNA extraction and PCR DNA amplification quantification. Step 1: Collecting samples entails taking DNA from blood or other bodily fluids for examination. Step 2: DNA extraction involves cracking open the cells using heat or chemicals to release the DNA. Step 3: Purifying the sample entails separating the DNA from cellular waste and other contaminants.
Learn more about DNA here:
https://brainly.com/question/14973625
#SPJ4
Match each term to its measuring unit. amperes(A) farad(F) ohm(Ω) henry(H) volts(V) d(F) ohm(Ω) henry(H) volts(V) watts(W) resistance arrowRight voltage arrowRight current arrowRight power arrowRight
Answer:
Every measuring quantity has a unit.
Explanation:
Ampere or A is the measuring unit of current intensity.
Farad or F is the measuring unit of electrical capacitance.
Ohm or Ω is the measuring unit of electrical resistance.
Henry or H is the measuring unit of inductance
Volts or V is the measuring unit of voltage
Watts or W is the measuring unit of power.