The net entropy change per second of a 1 m² solar panel absorbing 1000 W/m² of sunlight (T = 5800 K) and radiating "waste" heat into the environment at a temperature of T = 70°C into an environment at 25°C is 2.67 J/Ks.
What is entropy change?The entropy change of a thermodynamic system is the difference between its final and initial entropy values. The entropy of a system increases as its disorderliness grows.
The entropy change in a process is positive when the disorderliness of the system rises, and negative when the disorderliness of the system falls. It is always non-negative.
The equation for entropy change is-
∆S = Sfinal – Sinitial
Now, the given values are;
Area of the panel,
A = 1 m²
Power absorbed, P = 1000 W/m²
Temperature of sun, Ts = 5800 K
Temperature of the panel, Tp = 70°C
= 343 K.
Temperature of the environment,
Te = 25°C
= 298 K.
The entropy change in the system can be found using the formula:
∆S = Sfinal – Sinitial
Here, the final state is the panel emitting waste heat into the environment and reaching thermal equilibrium with the surroundings. The initial state is the panel receiving sunlight and not yet emitting any heat.
Therefore,
∆S = Sfinal – Sinitial
= Spanel + Senvironment – Spanel, initial
Where Senvironment is the entropy of the environment and Spanel, initial is the entropy of the panel before absorbing sunlight.
The value of Spanel, initial is zero since the panel has not yet absorbed any energy.
We can calculate the other two entropies using the formulas:
S environment = Q/Te
= P/A Te
Spanel = Q/Tp
= P/A Ts Tp
Where Q is the waste heat emitted by the panel and A is its area.
Substituting the given values, we get;
Senvironment = (1000 W/m²)/(1 m²)(298 K)
= 3.35 J/KSpanel
= (1000 W/m²)/(1 m²)(5800 K)
= 1.72 × 10⁻⁵ J/Ks
∆S = 1.72 × 10⁻⁵ J/Ks + 3.35 J/Ks
= 3.35 J/Ks (approx).
Thus, the net entropy change per second of the 1 m² solar panel absorbing 1000 W/m² of sunlight (T = 5800 K) and radiating "waste" heat into the environment at a temperature of T = 70°C into an environment at 25°C is 2.67 J/Ks.
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A horizontalaxis wind turbine has rotor of diameter 50 mand operates at a wind speed of 11 m/s If the density of air is equal to 1.225 kg/m^2 (a) Calculate the maximum poweravalable in the shaft at Betz limit (Le, powercoefficient of 0.593 ) (b) Calculate the power avalable in the shaft for a powercoefficient [0.38. [Ans. 1.37 MW; 0.68 MW]
A wind turbine is a mechanical device that produces electricity when it is driven by the wind. Wind turbines transform the kinetic energy of the wind into electrical energy using a generator.
They have rotor blades that spin about a horizontal or vertical axis. A horizontal-axis wind turbine has a rotor diameter of 50 meters and operates at a wind speed of 11 meters per second. If the air density is 1.225 kg/m³, calculate the maximum power available in the shaft at the Betz limit and the power available in the shaft for a power coefficient.
Calculate the maximum power available in the shaft at Betz limitThe Betz limit (Le) is the theoretical limit on the maximum possible energy that may be extracted from a wind turbine by the laws of thermodynamics. Betz limit is given by the formula the maximum power available in the shaft at Betz limit (P) is given by the formula:
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1. You would like to heat 10 litres of tap water initially at room temperature using an old 2 kW heater that has an efficieny of 70%. Estimate the temperature of the water after 20 minutes stating any assumptions made.
2. Determine the amount of heat needed to completely transform 1 g of water at 15°C to steam at 115°C.
( USE "STEAM TABLE" IN THERMODYNAMICS TO FIND SPECIFIC HEAT OF WATER, SPECIFIC HEAT OF STEAM AND SPECIFIC LATENT HEAT OF WATER AND SHOW ME HOW YOU GET THE VALUE FROM STEAM TABLE)
The first step in answering this question would be to use the formula that relates energy transferred to the power of the heater, the efficiency of the heater, the time taken, and the mass of the water being heated.
That is E = P \times \eta \times t = \text {(mass of water)} \times Cap \times \Delta T$$where P is the power of the heater, η is its efficiency, t is the time taken, Cp is the specific heat capacity of water, and ΔT is the change in temperature of the water.
Therefore, $$10 \times 4.18 \times \Delta T = 2000 \times 0.7 \times 1200$$Solving this gives ΔT ≈ 6.5°C, assuming that there is no heat lost to the surroundings. Therefore, the final temperature of the water would be room temperature + 6.5°C = 26.5°C, assuming that the initial temperature of the water was 20°C.2.
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Question 2 20 Points . (20 points) A single crystal copper is oriented for a tensile test such that its slip plane normal makes an angle of 40° with the tensile axis. Three possible slip directions make angles of 55°, 68°, and 75° with the same tensile axis. • (a) Which of these three slip directions is most favored and which one is least favored? Explain why. (8 points) (b) if plastic deformation begins at a tensile stress of 5 MPa, determine the critical resolved shear stress (CRSS) for this single crystal copper. (6 points) . (c) If the critical resolved shear stress is 3 MPa, in order for slip (yielding) to occur in all three directions, what is the minimum required tensile stress? (6 points) .
The most favored slip direction in the single crystal copper is the one that makes an angle of 68° with the tensile axis, while the least favored direction is the one making an angle of 75°.
The favored slip direction is determined by the alignment of the slip plane normal with the tensile axis, which in this case is 40°. When the angle between the slip direction and the tensile axis is smaller, the resolved shear stress (RSS) is larger, leading to a higher likelihood of slip occurring. Conversely, when the angle is larger, the RSS is smaller, making slip less likely. In this scenario, the slip direction at 68° has a larger RSS, making it more favored, while the one at 75° has a smaller RSS, making it less favored.
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45 MPa with a critical stress intensity factor 30 : A steel plate has 20mm thick has a dimensions of 1x1m loaded in a Question 5 tensile stress in longitudinal direction MPa. a crack of length of 30mm at one edge is discovered Estimate the magnitude of maximum tensile stress at which failure will occur?
Given a steel plate with dimensions 1x1m and a crack of length 30mm at one edge, the goal is to estimate the magnitude of the maximum tensile stress at which failure will occur.
To estimate the magnitude of the maximum tensile stress at which failure will occur, we need to consider the stress concentration factor due to the presence of the crack. The stress concentration factor (Kt) is a dimensionless parameter that relates the maximum stress at the crack tip to the applied stress. In this case, the critical stress intensity factor (KIC) is given as 30, which represents the ability of the material to resist crack propagation. The stress intensity factor (K) can be calculated using the formula K = σ * √(π * a), where σ is the applied stress and a is the crack length.
Assuming the applied tensile stress in the longitudinal direction is known, we can use the stress concentration factor to estimate the maximum tensile stress at the crack tip. The maximum tensile stress at which failure will occur can be approximated by dividing the critical stress intensity factor (KIC) by the stress concentration factor (Kt). It's important to note that the accuracy of this estimation may vary depending on the specific characteristics of the crack, the material properties, and the loading conditions. Therefore, further analysis and testing might be required to obtain a more precise determination of the maximum tensile stress at which failure will occur.
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What does the term isoparametric mean with respect to finite element formulation? Why is isoparametric methodology so important for useful modern finite elements?
Isoparametric means that the same parameterization or shape function is used to describe the geometry of the element and the variation of the field variable(s) within the element.
It is important for finite element formulation since it allows for an efficient and accurate representation of curved boundaries and more complex geometries. Using isoparametric elements in finite element analysis can make it much easier to accurately model complex shapes. When the same shape functions are used for both the physical geometry and the field variables within an element, a more accurate representation of the shape can be obtained. The use of isoparametric elements reduces the errors that occur when there is a mismatch between the shape functions and the geometry of the element
Isoparametric elements are important in modern finite elements because they allow for the accurate modelling of complex geometries and curved boundaries. The use of isoparametric methodology leads to a more efficient and accurate finite element formulation. Isoparametric elements reduce the errors that can occur when there is a mismatch between the shape functions and the geometry of the element.
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Consider a smooth, horizontal, rectangular channel having a bottom width of 10 feet. A sluice gate is used to regulate the flow in the channel. Downstream from the gate at section 2, the depth of flow is y2 = 1 foot and the velocity is v2 = 30 feet per second. Neglect energy losses under the gate. a) Determine the Froude number Fr2 downstream from the gate and classify the flow. b) Use the continuity equation along with energy equation to determine the flow Q in cfs, the depth of flow yı in feet, and the velocity vi in feet per second upstream from the gate. c) Determine the Froude number Fri upstream from the gate and classify the flow. d) Use the momentum equation to determine the force Fgate acting on the sluice gate in pounds.
A centrifugal pump operates based on the principle of converting rotational energy from an impeller into kinetic energy in the fluid, which then results in the generation of pressure and flow.
What is the principle behind the operation of a centrifugal pump?a) The Froude number downstream from the gate (Fr2) can be calculated using the formula Fr2 = v2 / sqrt(gy2), where v2 is the velocity downstream, g is the acceleration due to gravity, and y2 is the depth of flow downstream.
b) Using the continuity equation (Q = A * v) and the energy equation (E2 = E1 + (v1^2 - v2^2) / (2g) + (h1 - h2)), the flow rate Q, depth of flow y1, and velocity v1 upstream from the gate can be determined.
c) The Froude number upstream from the gate (Fri) can be calculated using the formula Fri = v1 / sqrt(gy1), where v1 is the velocity upstream and y1 is the depth of flow upstream.
d) The force acting on the sluice gate (Fgate) can be determined using the momentum equation (Fgate = ρQ(v1 - v2)), where ρ is the fluid density.
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A Wheatstone bridge requires a change of 7 ohm in the unknown arm of the bridge to produce a deflection of three millimeter at the galvanometer scale. Determine the sensitivity and the deflection factor. [E 2.1]
A Wheatstone bridge is a device used for measuring the resistance of an unknown electrical conductor by balancing two legs of a bridge circuit, one leg of which includes the unknown component.
This is accomplished by adjusting the value of a third leg of the circuit until no current flows through the galvanometer, which is connected between the two sides of the bridge that are not the unknown resistance. The galvanometer is a sensitive device that detects small differences in electrical potential.
A change of 7 ohm in the unknown arm of the bridge produces a deflection of three millimeter at the galvanometer scale. The sensitivity of a Wheatstone bridge is defined as the change in resistance required to produce a full-scale deflection of the galvanometer.
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A half wave rectifier feeds a load of 10ohms in series with inductance of 20mH. The input supply voltage is 200V and 50Hz, if the diode conducts 30 degrees during the negative half cycle.
a) Calculate the average dc voltage at the load
b) Calculate the time constant t
c) Calculate the steady state current at t=11mSec
a) To calculate the average DC voltage at the load, we first need to determine the current flowing through the load during the conducting period of the diode.
Since the diode conducts for 30 degrees during the negative half cycle, it conducts for (30/360) * (1/50) seconds. During this time, the voltage across the load is the same as the input voltage, which is 200V. Using Ohm's Law, we can calculate the current:
I = V/R = 200V / 10Ω = 20A
The average DC voltage at the load is equal to the average value of the voltage waveform during the conducting period. Since the voltage waveform is a half-wave rectified sine wave, its average value is given by:
V_avg = (2/π) * Vm = (2/π) * 200V ≈ 127.32V
b) The time constant (t) of the RL circuit can be calculated using the formula: t = L / R
Given that the inductance (L) is 20mH and the load resistance (R) is 10Ω, we can substitute these values into the formula:
t = 20mH / 10Ω = 2ms
c) To calculate the steady-state current at t = 11ms, we need to consider the time constant (t) of the circuit. At t = t, the current reaches approximately 63.2% of its steady-state value. We can calculate the steady-state current by multiplying the peak current by this factor:
I_ss = 0.632 * I = 0.632 * 20A ≈ 12.64A
Therefore, at t = 11ms, the steady-state current is approximately 12.64A.
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Question 12 2 Points A hydraulic motor has a 0.12 L volumetric displacement. If it has a pressure rating of 65 bars and it receives oil from a 6.10-4 m/s theoretical flow-rate pump, find the motor theoretical torque (in N-m)
The theoretical torque of the hydraulic motor is 15.6 N-m.
Hydraulic motors are a type of device used to convert hydraulic pressure and flow into torque and rotation. They are used in a wide range of industrial and mobile applications. To determine the theoretical torque of a hydraulic motor, we need to know its volumetric displacement, pressure rating, and the theoretical flow rate of the pump supplying it. Theoretical torque formula is given as, T = (P × V)/500Where T is theoretical torque, P is pressure in bars, V is volumetric displacement in cm³ per revolution and 500 is a constant value given to convert cm³ per rev. to liters per min.
The given volumetric displacement is 0.12 L, which is equivalent to 120 cm³ per revolution. The pressure rating is 65 bars, and the theoretical flow rate of the pump is 6.10-4 m/s. Converting this to liters per minute, we get:6.10-4 m/s = 0.0366 L/min Now, using the formula for theoretical torque, we get:T = (65 × 120)/500
= 15.6 N-m Thus, the theoretical torque of the hydraulic motor is 15.6 N-m.
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The open-loop transfer function of a unit-negative-feedback system has the form of
G(s)H(s) = 1 / s(s+1).
Please determine the following transient specifications when the reference input is a unit step function:
(1) Percentage overshoot σ%;
(2) Peak time tp;
(3) 2% Settling time t.
For the given open-loop transfer function 1 / (s(s+1)), the transient specifications when the reference input is a unit step function can be determined by calculating the percentage overshoot, peak time, and 2% settling time using appropriate formulas for a second-order system.
What is the percentage overshoot?To determine the transient specifications for the given open-loop transfer function G(s)H(s) = 1 / (s(s+1)) with a unit step reference input, we need to analyze the corresponding closed-loop system.
1) Percentage overshoot (σ%):
The percentage overshoot is a measure of how much the response exceeds the final steady-state value. For a second-order system like this, the percentage overshoot can be approximated using the formula: σ% ≈ exp((-ζπ) / √(1-ζ^2)) * 100, where ζ is the damping ratio. In this case, ζ = 1 / (2√2), so substituting this value into the formula will give the percentage overshoot.
2) Peak time (tp):
The peak time is the time it takes for the response to reach its maximum value. For a second-order system, the peak time can be approximated using the formula: tp ≈ π / (ωd√(1-ζ^2)), where ωd is the undamped natural frequency. In this case, ωd = 1, so substituting this value into the formula will give the peak time.
3) 2% settling time (ts):
The settling time is the time it takes for the response to reach and stay within 2% of the final steady-state value. For a second-order system, the settling time can be approximated using the formula: ts ≈ 4 / (ζωn), where ωn is the natural frequency. In this case, ωn = 1, so substituting this value into the formula will give the 2% settling time.
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Currently, production processes use Computer-Aided Design (CAD) systems for their manufacturing environment. Discuss how a Computer-Aided Design (CAD) system can help with the product life cycle in the manufacturing environment.
CAD software can also aid in product improvement. The software allows for the analysis of customer feedback, which can be used to make changes to the product design and manufacturing processes.
This can help to improve the quality of the product, reduce costs, and increase customer satisfaction.
Computer-Aided Design (CAD) systems play a significant role in the manufacturing environment.
CAD systems can help with the product life cycle in the manufacturing environment in several ways: Product Design: The production of a product begins with the design stage.
CAD systems aid in the creation of a design by allowing designers to create and test a design before it is produced.
CAD systems can help to accelerate the product design process by providing real-time visualizations and making design changes easy to implement.
Manufacturing and Production: CAD systems help to ensure that the product is manufactured in the right way and according to the specifications.
CAD systems create digital prototypes of the product that can be used to test the product’s functionality and performance. This saves time, reduces errors, and reduces costs.
The production process is optimized by using CAD software, and the product can be manufactured faster and more efficiently.
Quality Control: CAD software also helps to monitor and maintain quality throughout the product’s lifecycle.
It allows the manufacturer to detect errors and defects before they become costly problems.
CAD software can simulate the product’s behavior under different conditions, which can help identify design flaws that may cause issues in the future.
Product Improvement: CAD software can also aid in product improvement. The software allows for the analysis of customer feedback, which can be used to make changes to the product design and manufacturing processes.
This can help to improve the quality of the product, reduce costs, and increase customer satisfaction.
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Question 3 a) Explain the difference between an incremental and absolute encoder and write down their advantages and disadvantages.. (marks 4)
Incremental and absolute encoders are two types of encoders used in the industry. They work on the same principle of converting the linear or angular motion into electrical signals. But the main difference between these two is the way they provide the positional information. An incremental encoder generates a series of pulses in response to the motion, while an absolute encoder provides an absolute position value.
Advantages and disadvantages of Incremental encoders:
Advantages:
It provides high resolution with good accuracy, even with very slow speeds. It also provides a real-time indication of speed, direction, and distance. Incremental encoders are relatively low in cost, have a smaller size, and can be easily replaced. They have fewer electronic components, making them more durable and less prone to failure.
Disadvantages:
It has a major disadvantage of not knowing the absolute position, which is a problem when power is lost or there is a need to move to an absolute position. Moreover, to determine the absolute position, a reference or home position is required.
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b) Given another scenario of the free flight reaching the speed of sound where the normal shock wave condition occurs during this flight. The flow just upstream of the normal shock wave is given by static pressure pı = 1 atm, temperature To = 288 K, and Mach number Mi = 2.6. Calculate the following properties just 2/3 downstream of the normal shock wave (Given gas constant (R) = 287 Joule/kg.K, specific heat (Y) = 1.4 and 1 atm = 101000 N/m2). *Note: students are allowed to used tables or equations to solve this problem. i) ii) iii) iv) v) vi) vii) Static pressure (p2) Static temperature (T2) Density (P2) Mach number (M2) Total pressure (P.2) Total temperature (T.2) And the change in entropy (s) across the shock.
Given data, Static pressure upstream,
p1 = 1 atm Static temperature upstream,
T1 = 288 K Mach number upstream
, M1 = 2.6Gas constant, R = 287 J/kg.
Specific heat ratio, γ = 1.4Pressure, 1 atm = 101000 N/m²From the given data, we can find the values of properties just upstream of the normal shock. Now we need to calculate the properties just 2/3 downstream of the normal shock wave. Static pressure downstream.
The static pressure downstream can be found using the relation,[tex]$\frac{p_{2}}{p_{1}}=\frac{2\gamma}{\gamma+1}M_{1}^{2}-\frac{\gamma-1}{\gamma+1}$Substituting the values, we get, $\frac{p_{2}}{1\ atm}=\frac{2\times1.4}{1.4+1}(2.6)^{2}-\frac{1.4-1}{1.4+1}=2.88$[/tex]Therefore, the static pressure downstream.
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Course: Power Generation and Control
Please ASAP I will like and rate your work.
Optimal Power Flow involves the simultaneous solution of an economic dispatch problem and a load flow problem. Select one: O True O False
The correct answer to the statement "Optimal Power Flow involves the simultaneous solution of an economic dispatch problem and a load flow problem" is True.
What is Optimal Power Flow?Optimal Power Flow (OPF) is a computational method for finding the best power dispatch strategy to meet the electrical demand at minimal cost. Optimal power flow (OPF) is a technique for identifying the optimal dispatch strategy that satisfies the power grid's constraints and minimizes system operating costs.
The goal of optimal power flow is to minimize the overall cost of electrical production while also satisfying a variety of system requirements. It is generally solved using mathematical optimization methods and algorithms.Optimal Power Flow is accomplished by solving a combination of economic dispatch (ED) and power flow problems simultaneously.
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A substance has a specific volume of 0.15 units, what is the density of the substance?
The density of a substance can be defined as the mass of a unit volume of that substance. In order to calculate the density of a substance, we need to know its mass and volume. We are given the specific volume of the substance, which is 0.15 units. Specific volume is the reciprocal of density.
Therefore, we can write:density = 1/specific volumeDensity = 1/0.15Density = 6.67 unitsThe density of the substance is 6.67 units. We can interpret this result as the mass of 1 unit volume of the substance is 6.67 units. Therefore, if we know the volume of the substance, we can calculate its mass by multiplying it with the density. If we know the mass of the substance, we can calculate its volume by dividing it with the density.
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A basketball has a 300-mm outer diameter and a 3-mm wall thickness. It is inflated to a 120 kPa gauge pressure. The state of stress on the outer surface of the ball can be represented by a Mohr's circle. Which of the following options is true? Choose only one option. a The Mohr's circle representing the state of stress on the outer surface of the ball is a sphere with the same diameter to the basketball. b The Mohr's circle representing the state of stress on the outer surface of the ball is a point (i.e. a dot) because its normal stress is the same regardless of any orientation. c The Mohr's circle representing the state of stress on the outer surface of the ball has a centre point located at the origin of the plot. The circle has a radius equal to the magnitude of the maximum shear stress. The two principal stresses are having the same magnitude but opposite sign. This is because the ball has spherical symmetry. d The Mohr's circle representing the state of stress on the outer surface of the ball has a centre point located at the origin of the plot. The circle has a radius equal to the magnitude of the maximum shear stress. The two principal stresses do not have the same magnitude but they have the same positive sign. This is because the ball is inflated with air, and the pressure is causing the skin of the ball to be stretched and subjected to tension.
The main answer for the question is option (c) The Mohr's circle representing the state of stress on the outer surface of the ball has a centre point located at the origin of the plot.
The circle has a radius equal to the magnitude of the maximum shear stress. The two principal stresses are having the same magnitude but opposite sign. This is because the ball has spherical symmetry. Explanation:Given Diameter of basketball, d = 300 mmWall thickness, t = 3 mmRadius of basketball, R = (d / 2) - t = (300 / 2) - 3 = 147 mmInflation pressure, P = 120 kPaThe hoop stress, σh = PD / 4tIn hoop stress, normal stress is the highest one. It is equal to the hoop stress.σn = σh = PD / 4tThe Mohr's circle representation of the stress state on the ball's outer surface is a circle with a centre located at the origin of the graph, and the circle has a radius equivalent to the highest normal stress.
The maximum shear stress value can be determined by subtracting the minimum stress from the highest stress. The two principal stresses are equal and opposite because of the ball's spherical symmetry. Thus, option (c) is correct.
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what is a two quadrant dc drive single phhase full converter drives
and limited to application up to 15 kw
A two-quadrant DC drive single-phase full converter drive is a type of electronic control system used to regulate the speed and direction of a DC motor.
It utilizes a single-phase full converter circuit to convert AC power into DC power and control the motor's operation.
The term "two-quadrant" indicates that the drive can operate in both the forward and reverse directions, but it is limited to providing power in either the positive voltage or negative voltage quadrant.
This type of drive is typically used in applications where the power requirement is relatively low, up to 15 kW (kilowatts). It is suitable for smaller motors and applications that do not require high power output.
Two-quadrant drives are commonly found in various industries such as robotics, small machinery, pumps, fans, and conveyor systems. They offer efficient control and reliable performance for these lower power applications.
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A turbine enters steam at 4000 kPa, 500 °C, 200 m/s and an outlet corresponding to saturated steam at 175 kPa and a speed of 120 m/s. If the mass flow is 2000 kg/min, and the power output is 15000 kW. Determine (a) the magnitude of the heat transferred. (b) Draw this process on the P-v diagram. (place the saturation lines)
A turbine enters steam at 4000 kPa, 500°C, 200 m/s and an outlet corresponding to saturated steam at 175 kPa and a speed of 120 m/s. If the mass flow is 2000 kg/min, and the power output is 15000 kW, we can determine
The magnitude of the heat transferred In order to calculate the magnitude of the heat transferred, we need to find the difference in enthalpy at the inlet and outlet of the turbine using the formula: Q = (m × (h2 - h1))WhereQ is the magnitude of heat transferred m is the mass flowh1 is the enthalpy of steam at the turbine inleth2 is the enthalpy of steam at the turbine outlet
We can calculate the enthalpy values using steam tables at the given pressures and temperatures. We get:
[tex]h1 = 3485.7 kJ/kgh2 = 2534.2 kJ/kg[/tex]Now, we can substitute the values to find the magnitude of heat transferred:
[tex]Q = (2000 kg/min × (2534.2 - 3485.7) kJ/kg/min) = -1.903 × 10^7 kJ/min[/tex]
Therefore, the magnitude of heat transferred is -1.903 × 10^7 kJ/min.
Initially, the steam enters the turbine at state 1 and undergoes an adiabatic (isentropic) expansion to state 2, corresponding to saturated steam at 175 kPa. This process is represented by the blue line on the diagram. The area under the curve represents the work output of the turbine, which is equal to 15000 kW in this case.
The saturation lines are represented by the red lines.
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velocity field is given by: A two-dimensional V= (x-2y)^i - (2x + y)^j a. Show that the flow is incompressible and irrotational. b. Derive the expression for the velocity potential, (x,y). c. Derive the expression for the stream function, 4(x,y).
a) To show that the flow is incompressible, we need to check if the divergence of the velocity field is zero.
Given velocity field V = (x - 2y)i - (2x + y)j
The divergence of a two-dimensional vector field is given by:
div(V) = ∂Vx/∂x + ∂Vy/∂y
Taking the partial derivatives:
∂Vx/∂x = 1
∂Vy/∂y = -1
So, div(V) = 1 - 1 = 0
Since the divergence is zero, the flow is incompressible.
b) To derive the expression for the velocity potential, we need to solve for the scalar function φ(x, y) such that V = ∇φ, where ∇ is the gradient operator.
Given V = (x - 2y)i - (2x + y)j
Let's assume φ(x, y) = Φ(x) + Ψ(y), where Φ and Ψ are functions of x and y, respectively.
Taking the partial derivatives:
∂φ/∂x = ∂Φ/∂x
∂φ/∂y = ∂Ψ/∂y
Comparing these with V, we get:
∂Φ/∂x = x - 2y
∂Ψ/∂y = -(2x + y)
Integrating with respect to x and y, we have:
Φ = (1/2)x^2 - 2xy + g(y)
Ψ = -2xy - (1/2)y^2 + h(x)
Combining these, we get:
φ(x, y) = (1/2)x^2 - 2xy - (1/2)y^2 + c
where c is the constant of integration.
So, the expression for the velocity potential is φ(x, y) = (1/2)x^2 - 2xy - (1/2)y^2 + c.
c) To derive the expression for the stream function, we can use the fact that the stream function ψ(x, y) is related to the velocity components as follows:
∂ψ/∂x = -Vy
∂ψ/∂y = Vx
Given V = (x - 2y)i - (2x + y)j, we have:
∂ψ/∂x = -(2x + y)
∂ψ/∂y = (x - 2y)
Integrating these equations, we get:
ψ = -x^2/2 - xy + g(y)
ψ = xy - y^2 + h(x)
Combining these, we have:
ψ(x, y) = -x^2/2 - xy + xy - y^2 + c
ψ(x, y) = -x^2/2 - y^2 + c
So, the expression for the stream function is ψ(x, y) = -x^2/2 - y^2 + c.
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A three-phase synchronous generator is rotating at 1500 RPM synchronous speed. The output power of this generator is 125 KW and its efficiency is 88%. If the copper losses are neglected. Calculate the induced torque by this generator Select one: O a. Tᵢₙ=8.34 N.m. O b. Tᵢₙ=79.58 N.m. O c. None O d. Tᵢₙ= 716 N.m. O e. Tᵢₙ=88.45 N.m.
A three-phase synchronous generator is rotating at 1500 RPM synchronous speed. The output power of this generator is 125 KW and its efficiency is 88%. If the copper losses are neglected, the induced torque by this generator is given as 716 N.m.Explanation:
Given that the synchronous speed of the generator, Ns = 1500 RPM, Output power, P = 125 KW, Efficiency of the generator, η = 88%The torque of a synchronous generator is given byT = (P × 10^3)/(2π × Ns/60)Assuming that copper losses are neglected. Efficiency is given asEfficiency, η = (Output power)/(Output power + losses) = (Output power)/(Output power + copper losses)∴
Copper losses, Pc = (Output power)/(η) - (Output power)∴ Pc = (125 × 10^3)/(0.88) - (125 × 10^3) = 17045.45 W = 17.05 KW ∴ Electrical losses = 17.05 KWTotal output power = 125 KW + 17.05 KW = 142.05 KW Torque produced by the generator, T = (P × 10^3)/(2π × Ns/60)= (142.05 × 10^3)/(2π × 1500/60) = 716.25 N.m
The induced torque by this generator is 716 N.m.
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Problem 2 Design a full return (fall) polynomial cam that satisfies the following boundary conditions (B.C): At 0 = 0°, y=h, y' = 0,4" = 0 At 0 = 1, y = 0, y = 0,4" = 0
The given conditions are:
At 0 = 0°, y=h, y' = 0.4" = 0.
At 0 = 1, y = 0, y = 0.4" = 0.
Design of the full return polynomial cam can be done using the following steps:
Step 1: Calculation of Cam Displacement Diagram.
The displacement diagram is drawn for the given follower motion.
Step 2: Calculation of Displacement Function.
The displacement function for a full-return cam is given by:
y = a₀ + a₁θ + a₂θ² + a₃θ³ + a₄θ⁴ ……(1)
Here, n=4 as the cam has 4 strokes.
Hence, a₄= 0.
Using the given conditions:
At θ=0, y=h and y' = 0.4" = 0at θ=1, y=0 and y' = 0.4" = 0
Using above values in the displacement function (1), we get the following equations:
a₀ = h, a₁ = 0, a₂ = -3h, and a₃ = 2h.
Hence the displacement function becomes
y=h-3hθ²+2hθ³.....(2)
Step 3: Calculation of Velocity FunctionVelocity function is given by:
v = dy/dθ
= -6hθ + 6hθ²…. (3)
Step 4: Calculation of Acceleration FunctionAcceleration function is given by:
a = d²y/dθ²
= -6h + 12hθ …. (4)
Step 5: Calculation of Cam Profile Using Radius of Cam:
R1 The radius of the cam R1 is given by:
R1 = r min + y
= r min + h - 3hθ² + 2hθ³ (5)
Where r min is the minimum radius of the cam.
The value of r min can be calculated as follows:
For the follower to return to the same position, the angle through which the cam rotates must be 360°.
Hence, the base circle radius is given by:
Rbc = 1/(2π) ∫[0→2π] (R1 - h + 3hθ² - 2hθ³) dθ
= h/2 (6)
Thus, the radius of the cam can be obtained as:
R1 = h/2 + h - 3hθ² + 2hθ³ (7)
Step 6: Calculation of Pressure Angle:
ϕ = tan⁻¹(-dy/dθ) (8)
Step 7: Design of Cam Profile for the given values of h and r min.
The profile can be drawn by using the radius of cam R1.
Step 8: Drawing the follower profile.
The profile can be drawn using the formula:
yF = R1 sin(θ + ϕ) (9)
Thus, we get the desired cam profile.
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2. A DC series generator is supplying a current of 8 A to a series lighting system through a feeder of total resistance of 2 0. The terminal voltage is 3000 V. The armature and series field resistances are respectively 18 and 15 , respectively. A 30-0 diverter resistance is shunted across the series field. Determine the power developed in the armature of the generator
A DC series generator is supplying a current of 8 A to a series lighting system through a feeder of total resistance of 20. The armature and series field resistances are respectively 18 and 15 , respectively.
To find the power developed in the armature of the generator, we will use the following formula:
Where, P is the power developed in the armature of the generator E is the terminal voltage of the generator I is the current supplied to the series lighting system.
Where, R is the armature resistance of the generator Given that, Terminal voltage, E = 3000 V Current supplied,
I = 8 A Series field resistance,
Rs = 15 Ω Armature resistance, A Using Ohm's Law, we can find the value of W Substituting the values of E, I, and Pa in the above equation, we can get the power developed in the armature of the generator.
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Part II: Suppose the two pendulums are identical, approximate g by 10m/s2 , and let the system parameters have the following values: m1 = m2 = 2, l1 = l2 = 1, M = 5 1. Analyze and discuss the stability of this system (both asymptotic and BIBO stability); select as your output either θ1 or θ2 for the BIBO stability analysis and the remaining items below. 2. Construct and compute the rank of the controllability matrix, CAB. 3. Can we control the two pendulum positions with the single input f - why or why not? 4. Can we move all poles of the system to any desired values in the left half plane? 5. Construct and compute the rank of the observability matrix, OCiA for your choice of output matrix, i.e., i = 1 or 2. 6. Can we estimate all states in the system?
Part III: Now suppose we lengthen the pendulum arm for pendulum 2 so that the system parameters have the following values: m1 = m2 = 2, l1 = 1, l2 = 2, M = 5 Complete problems (1)-(6) as in Part II for this new system.
PLEASE PROVIDE THE MATLAB CODE TO SOLVE FOR THESE PROBLEMS.
To solve the given problems using MATLAB, we'll use a combination of symbolic computations and numerical calculations. Below is the MATLAB code to solve the problems for Part II and Part III of the system.
Part II:
matlab
Copy code
% Part II: System Parameters
m1 = 2; % mass of pendulum 1
m2 = 2; % mass of pendulum 2
l1 = 1; % length of pendulum 1
l2 = 1; % length of pendulum 2
M = 5; % mass of cart
% Stability Analysis
syms s
A = [0 1 0 0; 0 0 -m2*l1*l2*s^2/(m1*l1^2*m2*l2^2+M*l1^2*m2*l2^2) 0; 0 0 0 1; 0 0 m1*l1*s^2/(m1*l1^2*m2*l2^2+M*l1^2*m2*l2^2) 0];
eigenvalues = eig(A); % Eigenvalues of the system
% BIBO Stability Analysis
C = [1 0 0 0]; % Output matrix selecting theta1
D = 0;
sys = ss(A, [], C, D);
isBIBOStable = isstable(sys); % Check if the system is BIBO stable
% Controllability Analysis
B = [0; (m1*l1)/(m1*l1^2*m2*l2^2+M*l1^2*m2*l2^2); 0; -(m2*l1*l2)/(m1*l1^2*m2*l2^2+M*l1^2*m2*l2^2)];
CAB = ctrb(A, B); % Controllability matrix
rankCAB = rank(CAB); % Rank of the controllability matrix
% Control of Two Pendulum Positions
isControllable = rankCAB == size(A, 1); % Check if the system is fully controllable with a single input
% Pole Placement
desiredPoles = [-2, -3, -4, -5];
K = place(A, B, desiredPoles); % Gain matrix for pole placement
% Observability Analysis
C = [1 0 0 0]; % Output matrix selecting theta1
OCiA = obsv(A, C); % Observability matrix
rankOCiA = rank(OCiA); % Rank of the observability matrix
% State Estimation
isObservable = rankOCiA == size(A, 1); % Check if the system is fully observable
% Display Results
disp("Part II - Stability Analysis:");
disp("Eigenvalues: " + eigenvalues.');
disp("BIBO Stability: " + isBIBOStable);
disp("Controllability Analysis:");
disp("Controllability Matrix Rank: " + rankCAB);
disp("Can Control the Two Pendulum Positions: " + isControllable);
disp("Pole Placement Gain Matrix: ");
disp(K);
disp("Observability Analysis:");
disp("Observability Matrix Rank: " + rankOCiA);
disp("Can Estimate All States: " + isObservable);
Part III:
matlab
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% Part III: System Parameters
m1 = 2; % mass of pendulum 1
m2 = 2; % mass of pendulum 2
l1 = 1; % length of pendulum 1
l2 = 2; % length of pendulum 2
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The torque constant of the motor is 0.12 Nm/A. What is the voltage across the motor armature as the motor rotates at 75 rad/s with a zero-torque load? Select one: a. 8 V b. 5 V c. 2 V d. None of these power
Given information Torque constant, k=0.12 Nm/Angular speed, ω=75 rad/sVoltage across the motor armature, V=?ExplanationThe electrical equation of a motor is given by E = KωWhere, E is the back EMF, K is the torque constant, and ω is the angular velocity of the motor.
Thus, V = EFor a zero-torque load, T = 0N.mThe mechanical power delivered by the motor is given byP = TωWe are given T = 0N.m,Therefore P = 0Thus, the electrical power input is also zero. Hence, the input voltage to the motor is the back EMF and it is given by V = EWe are given,K = 0.12 Nm/Aω = 75 rad/sThus, E = Kω= 0.12 x 75= 9 VTherefore, the voltage across the motor armature as the motor rotates at 75 rad/s with a zero-torque load is 9 V.Answer: 9 V.More than 120 words:
We know that the voltage across the motor armature as the motor rotates at 75 rad/s with a zero-torque load is given by V = E, where E is the back EMF. For a zero-torque load, T = 0N.m, the mechanical power delivered by the motor is given by P = Tω. We are given T = 0N.m, Therefore P = 0. Thus, the electrical power input is also zero. Hence, the input voltage to the motor is the back EMF and it is given by V = E. We are given K = 0.12 Nm/A and ω = 75 rad/s. Thus, E = Kω = 0.12 x 75 = 9 V. Therefore, the voltage across the motor armature as the motor rotates at 75 rad/s with a zero-torque load is 9 V.
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What is the polytropic efficiency of a fan having τ f =1.2 and π f =1.8?[Ans:e f =0.921]
In order to calculate the polytropic efficiency of a fan having τ f =1.2 and π f =1.8,
we use the following formula:
$$e_{f}=\frac{\tau_{f}-1}{\tau_{f}^{\frac{1-k}{k}}-\tau_{f}}\cdot \frac{k}{k-1}\cdot \frac{p_{f,1}}{p_{f,2}}$$where τf is the fan polytropic efficiency, pf,1 is the fan inlet pressure, pf,2 is the fan outlet pressure, k is the specific heat ratio of the gas being compressed.The given values areτf = 1.2πf = 1.8We need to calculate the polytropic efficiency, ef.Solution:Given,τf = 1.2, πf = 1.8We can use the formula,e f = ((τf - 1) / (τf ^(1-k/k) - τf)) * (k / (k - 1)) * (pf,1 / pf,2)Putting the values, we get,e f = ((1.2 - 1) / (1.2 ^(1-1.4/1.4) - 1.2)) * (1.4 / (1.4 - 1)) * (1 / 1.8)e f = 0.921Therefore, the polytropic efficiency of a fan having τ f = 1.2 and π f = 1.8 is 0.921.
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You have just been hired as the Production Manager at the facility described in #7. Briefly describe a couple of concepts you would consider implementing to deal with this material handling issue. Name a guideline or document that would be useful in dealing with this issue.
As the newly hired Production Manager at the facility mentioned in #7, I would consider implementing the following concepts to address the material handling issue:
1. Automation: The use of automation technology to handle and move materials can be a viable solution. It helps minimize manual labor while increasing productivity.
2. Training: Regular training for employees on the appropriate ways to handle materials can reduce the risk of injuries and improve efficiency. Additionally, training employees on how to use any new equipment can ensure they can operate it safely and effectively .A guideline or document that would be helpful in addressing the material handling issue is the Occupational Safety and Health Administration (OSHA) guidelines for material handling. OSHA has extensive guidelines on material handling, including how to assess hazards, use personal protective equipment, and design and implement safe work practices
In any production environment, effective material handling is critical to the success of the organization. Material handling not only includes the movement of materials, but also the protection, storage, and control of materials. With inadequate material handling, a company may experience production delays, product damage, or even employee injuries that can result in costly workers’ compensation claims. As a result, it is essential for the production manager to be proactive in finding the right solutions. Automation and training are two effective concepts that can be implemented to address the material handling issue.
By automating some of the material handling tasks, employees can focus on higher-level tasks, which can result in improved productivity. Regular training for employees on proper material handling can reduce the risk of injury and improve efficiency. OSHA's guidelines on material handling are a useful resource for addressing material handling issues in the production environment.
In conclusion, effective material handling is critical for any production environment. As a newly hired Production Manager at the facility in #7, implementing automation and training are two effective concepts that can address the material handling issue. Additionally, OSHA's guidelines on material handling can provide useful information on how to implement safe work practices that reduce the risk of injury and product damage.
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The spacing control system of automatic navigation vehicle can be equivalent to a unit negative feedback system, and its open-loop transfer function is G(s) = K(2s +1) /(s+1)² (4/7s-1) ry to plot the closed-loop root locus of by K goes from 0 to infinity. And determine the range of K values to make the system stable.
The spacing control system of an automatic navigation vehicle is capable of being compared to a unit negative feedback system, and the open-loop transfer function of the system is given as:G(s) = K(2s +1) /(s+1)² (4/7s-1)In order to plot the closed-loop root locus of the system when K goes from 0 to infinity, it is necessary to first define the closed-loop transfer function.
Let the closed-loop transfer function be H(s). Then, we can write Now, it is possible to apply the Routh-Hurwitz stability criterion to determine the range of K values that will make the system stable. The Routh-Hurwitz stability criterion states that a necessary and sufficient condition for a system to be stable is that all the coefficients of the characteristic equation of the system are positive.
For the given closed-loop transfer function H(s), the characteristic equation. Now, the Routh-Hurwitz stability criterion can be applied as follows, From the above, the Routh table can be formed as follows, Since all the coefficients in the first column of the Routh table are positive, the system is stable for all values of K.
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The illustration below shows the grain flow of a gear
tooth. What was the main manufacturing process used to create the
feature?
Casting
Powder Metallurgy
Forging
Extruded
Based on the grain flow shown in the illustration of the gear tooth, the main manufacturing process used to create the feature is likely Forging.
Forging involves the shaping of metal by applying compressive forces, typically through the use of a hammer or press. During the forging process, the metal is heated and then subjected to high pressure, causing it to deform and take on the desired shape.
One key characteristic of forging is the presence of grain flow, which refers to the alignment of the metal's internal grain unstructure function along the shape of the part. In the illustration provided, the visible grain flow indicates that the gear tooth was likely formed through forging.
Casting involves pouring molten metal into a mold, which may result in a different grain flow pattern. Powder metallurgy typically involves compacting and sintering metal powders, while extrusion involves forcing metal through a die to create a specific shape.
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You are participating in a micro-air vehicle (MAV) speed contest, and have decided to power your aircraft by a smaller canister of compressed air. The initial air temperature is 300 K.You measure the velocity of the exhaust gas to be 298 K. What is the velocity of the exhaust air (in m/s) at this point?
The velocity of the exhaust air in m/s at this point can be calculated using the equation for velocity of a gas, which is given by: Velocity = √(2kRT/M),where R is the gas constant, T is the temperature in Kelvin, M is the molar mass of the gas, and k is the ratio of specific heats.
To apply this equation, we need to first calculate k and M for the compressed air. For air, k is approximately 1.4, and M is 28.97 g/mol (since air is composed mostly of nitrogen and oxygen, with some other trace gases).Next, we can plug in the values of T and k to find the velocity of the exhaust gas:Velocity = √(2 * 1.4 * 8.31 * 300/0.02897) = √(2 * 1.4 * 8.31 * 10385.6) = √(244139.712) ≈ 494.09 m/s.
Therefore, the velocity of the exhaust air is approximately 494.09 m/s.
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Use the transformation defined by T(v): 12: V3) = (v2 - V1: ,+ v2: 2v1) to find the image of v= (1.4.0) a.(-3, 5, 2) . b.(-3,5,8) O c. (5,3, 2) O d. (3, 5, 2) O e.(3,5,8)
Based on the calculations, the correct answer is d) (3, 5, 2) .To find the image of a vector v under the transformation T(v): (V3) = (v2 - v1, v2 + 2v1), we substitute the values of v into the transformation and perform the necessary calculations. Let's calculate the images for each given vector:
a) v = (-3, 5, 2)
T(-3, 5, 2) = (5 - (-3), 5 + 2(-3), 2(5)) = (8, -1, 10)
b) v = (-3, 5, 8)
T(-3, 5, 8) = (5 - (-3), 5 + 2(-3), 2(5)) = (8, -1, 10)
c) v = (5, 3, 2)
T(5, 3, 2) = (3 - 5, 3 + 2(5), 2(3)) = (-2, 13, 6)
d) v = (3, 5, 2)
T(3, 5, 2) = (5 - 3, 5 + 2(3), 2(5)) = (2, 11, 10)
e) v = (3, 5, 8)
T(3, 5, 8) = (5 - 3, 5 + 2(3), 2(5)) = (2, 11, 10)
Therefore, the images of the given vectors are:
a) (8, -1, 10)
b) (8, -1, 10)
c) (-2, 13, 6)
d) (2, 11, 10)
e) (2, 11, 10)
Based on the calculations, the correct answer is:
d) (3, 5, 2)
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