Homework Answers
Q *t = kA*(T2-T1) / d
where (T2-T1) = temperature difference
d = thickness
A = cross-sectional area
Q can be decreased by decreasing the cross sectional area
increasing the thickness and decreasing the temperature difference
Heat flows at a rate of Q/t from a hot object to a cold object through...
Heat flows at a rate of Q/t from a hot object to a cold object through some material that has a thickness of d and a surface area of A. If the surface area of the material is increased to 2A and the thickness is increased to 4d then what rate does the heat flow from the hot object to the cold object now? [You may assume that the hot and cold object are unchanging in temperature.]
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transfe...
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transferred to the body. What does this amount of heat represent? Q2. (a) (5 marks) A wall ofa room is made of lightweight concrete material (ρ= 1600 kg/m.に0.79 W/m K and cp 0.84 kJ/kg K) with a thickness of 150 mm. Initially the wall is...
For the given system find 1) The total amount of heat exchange (W) 2) The temperature...
For the given system find
1) The total amount of heat exchange (W)
2) The temperature of the water at the outlet (degC)
All information should be included, the pipe is made of copper
and the internal fluid is water, external fluid is air
Water is flowing through a copper tube of lenght 1 m, diameter 5 cm
and thickness 0.8mm, at a rate of 0.8 kg/s, and an inlet
temperature 93 degC. If the tube is exposed to Air...
Question 2 0 out of 4 points The heat flux through an infinitely long cable at time t is given by...
Question 2 0 out of 4 points The heat flux through an infinitely long cable at time t is given by dT dx ctivity function of the cable. T0 is the temperature protile and t)is the heat dissipation as a where k(x) Ois the heat condu function of time. Consider the flux equation where/(0=exp (卅nanak A student measures the temperature at points x-(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.o) in length units during a lab experiment and records the...
A 2-mH inductor can store a certain amount of energy when a currently flows through it....
A 2-mH inductor can store a certain amount of energy when a currently flows through it. A 6-mH inductor can store the same amount of energy when currently flows through it. What is the ratio of the two currents (11/12)? O 0.58 O 0.33 O 1.73 O 3.00 O 0.83
The heat that is conducted through a body must frequently be removed by other heat transfer...
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of heat convection of...
3 2 T-A 1 1 2 3. The diagram above shows a plot of the temperature...
3 2 T-A 1 1 2 3. The diagram above shows a plot of the temperature (T) versus entropy (S) for a cyclic 3 step process of an ideal gas of N monoatomic particles. Your answers to the following questions can be expressed in terms of the values of temperature (Ti, T2, Ts) and entropy (S and S2). (a) Find the heat added to or subtracted from the system for each of the steps-QAB QBc, and QcA (b) Find the...
1) 2) 3) PROJECT #1 (2.5 Marks): The heat that is conducted through a body must...
1)
2)
3)
PROJECT #1 (2.5 Marks): The heat that is conducted through a body must frequently be removed by other heat transter processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width Z 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature 1. The conductivity of the aluminum...
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot...
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot gas flows when the system is being charged. In the charging process heat is transferred from the hot gas to the spheres and it increases the thermal energy stored in the spheres. Here are some variables that are important - the convection coefficient between the particle surface and the gas is h (W/m2 K) and the particle thermophysical properties are k (W/m K), Cp...
2. The followving data give the drying time T of a certain pauin n t a certain additive A. Find the first, second, third, and fourth-degree polynomials that fit the data and plot each polynomial...
2. The followving data give the drying time T of a certain pauin n t a certain additive A. Find the first, second, third, and fourth-degree polynomials that fit the data and plot each polynomial with the data. Set limits O and 10 on the x-axis and a function of the amount 10 on the x-axis and limits 0 and 150 on the y-axis. Determine the quality of the curve fit for each by computing J Note: You have to...
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transferred to the body. What does this amount of heat represent? Q2. (a) (5 marks) A wall ofa room is made of lightweight concrete material (ρ= 1600 kg/m.に0.79 W/m K and cp 0.84 kJ/kg K) with a thickness of 150 mm. Initially the wall is...
For the given system find
1) The total amount of heat exchange (W)
2) The temperature of the water at the outlet (degC)
All information should be included, the pipe is made of copper
and the internal fluid is water, external fluid is air
Water is flowing through a copper tube of lenght 1 m, diameter 5 cm
and thickness 0.8mm, at a rate of 0.8 kg/s, and an inlet
temperature 93 degC. If the tube is exposed to Air...
Question 2 0 out of 4 points The heat flux through an infinitely long cable at time t is given by dT dx ctivity function of the cable. T0 is the temperature protile and t)is the heat dissipation as a where k(x) Ois the heat condu function of time. Consider the flux equation where/(0=exp (卅nanak A student measures the temperature at points x-(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.o) in length units during a lab experiment and records the...
A 2-mH inductor can store a certain amount of energy when a currently flows through it. A 6-mH inductor can store the same amount of energy when currently flows through it. What is the ratio of the two currents (11/12)? O 0.58 O 0.33 O 1.73 O 3.00 O 0.83
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of heat convection of...
3 2 T-A 1 1 2 3. The diagram above shows a plot of the temperature (T) versus entropy (S) for a cyclic 3 step process of an ideal gas of N monoatomic particles. Your answers to the following questions can be expressed in terms of the values of temperature (Ti, T2, Ts) and entropy (S and S2). (a) Find the heat added to or subtracted from the system for each of the steps-QAB QBc, and QcA (b) Find the...
1)
2)
3)
PROJECT #1 (2.5 Marks): The heat that is conducted through a body must frequently be removed by other heat transter processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width Z 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature 1. The conductivity of the aluminum...
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot gas flows when the system is being charged. In the charging process heat is transferred from the hot gas to the spheres and it increases the thermal energy stored in the spheres. Here are some variables that are important - the convection coefficient between the particle surface and the gas is h (W/m2 K) and the particle thermophysical properties are k (W/m K), Cp...
2. The followving data give the drying time T of a certain pauin n t a certain additive A. Find the first, second, third, and fourth-degree polynomials that fit the data and plot each polynomial with the data. Set limits O and 10 on the x-axis and a function of the amount 10 on the x-axis and limits 0 and 150 on the y-axis. Determine the quality of the curve fit for each by computing J Note: You have to...
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