Homework Answers
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is generating heat at a constant rate in W/m] inside another sphere of radius ry. The radius of the internal sphere is a 10 cm and the radius of the outer sphere is 40 cm. The outer surface is exposed to ambient air at 27°C and a convection coethicient -30 W/m-K. The thermal conductivity of the external sphere is 6.0 W/m-K. If the temperature at...
please help me ASAP 2. [10] COI A steel tube (ks - 43.26 W/mK) of 5.08...
please help me ASAP
2. [10] COI A steel tube (ks - 43.26 W/mK) of 5.08 cm inner diameter and 7.62 em outer diameter is covered with 2.5 cm layer of insulation (k, -0.208 W/mK) the inside surface of the tube receivers heat from a hot gas at the temperature of 316°C with heat transfer co-efficient of 28 W/mK. While the outer surface exposed to the ambient air at 30°C with heat transfer co- efficient of 17 W/mK. Calculate heat...
1- If Q(cold) is 22 W, and Q(hot) is 92 W, what is the refrigerator's efficiency?(give...
1- If Q(cold) is 22 W, and Q(hot) is 92 W, what is the refrigerator's efficiency?(give as a fraction) 2- A building surface of 46 m2 is exchanging heat by convection with the air wind at 300 K. If the surface is at 400 K what is the rate of heat transfer in kW? (Air heat transfer coefficient, h, is 15 W/(m2 K)) (zero decimals and include units) 3- A house gains 387 MJ of heat during the day (8...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
Problem 2 (15 pts) A spherical container containing radioactive waste is thrown into the ocean waters maintained at 300 half of the container is made of stainless steel with a thermal conducti...
Problem 2 (15 pts) A spherical container containing radioactive waste is thrown into the ocean waters maintained at 300 half of the container is made of stainless steel with a thermal conductivity of 15.1 W/mK. The convection coefficient has the same value of 555 W/m2 K with both lid and bottom. The inner radius of the co the container is 600 K (the same for the lid and may be assumed to have an infinite contact resistance. Assume that the...
P1 (50 pts.) - A large plane wall has a thickness L-60 cm and thermal conductivity...
P1 (50 pts.) - A large plane wall has a thickness L-60 cm and thermal conductivity k 25 W/m-K. On the left surface (x-0), it is subjected to a uniform heat flux qo while the surface temperature To is constant. On the right surface, it experiences convection and radiation heat transfer while the surface temperature is TL-225°C and the surrounding temperature is 25°C. The emissivity and the convection heat transfer coefficient on the right surface are 0.7 and 15 W/m2-K,...
please help me as soon as possible [20] SECTION B (Attempt any one Question) a) A...
please help me as soon as possible
[20] SECTION B (Attempt any one Question) a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 W/mK). The temperature at the root is 500 °C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/mK. Determine the temperature distribution and rate of heat...
In stationary state operation, a transmission box receives 60 kW for the input arrow and powers...
In stationary state operation, a transmission box receives 60 kW
for the input arrow and powers the output arrow. The box loses
energy by heat transfer at a rate defined by Newton's Cooling Law
of Q = hA (Tb-Tf), where h = 0.171 kW / m2 * K, A = 1m2 is the
surface area of the box, Tb = 300K is the external temperature and
Tf = 20ºC is the surrounding air temperature, evaluate the power
obtained from the...
a) what is the heat loss per unit length from the pipe in W/m? b) Estimate...
a) what is the heat loss per unit length from the pipe in
W/m?
b) Estimate the heat loss per unit length if a 50 mm thick layer
of insulation with a conductivity of 0.058 W/m K. Neglect radiation
for this part.
3. A 0.20-m diameter, thin-walled steel pipe is used to transport saturated steam at a temperature of 486K in a room for which the air temperature is 25°C and convection heat transfer coefficient at the outer surface of...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is generating heat at a constant rate in W/m] inside another sphere of radius ry. The radius of the internal sphere is a 10 cm and the radius of the outer sphere is 40 cm. The outer surface is exposed to ambient air at 27°C and a convection coethicient -30 W/m-K. The thermal conductivity of the external sphere is 6.0 W/m-K. If the temperature at...
please help me ASAP
2. [10] COI A steel tube (ks - 43.26 W/mK) of 5.08 cm inner diameter and 7.62 em outer diameter is covered with 2.5 cm layer of insulation (k, -0.208 W/mK) the inside surface of the tube receivers heat from a hot gas at the temperature of 316°C with heat transfer co-efficient of 28 W/mK. While the outer surface exposed to the ambient air at 30°C with heat transfer co- efficient of 17 W/mK. Calculate heat...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
Problem 2 (15 pts) A spherical container containing radioactive waste is thrown into the ocean waters maintained at 300 half of the container is made of stainless steel with a thermal conductivity of 15.1 W/mK. The convection coefficient has the same value of 555 W/m2 K with both lid and bottom. The inner radius of the co the container is 600 K (the same for the lid and may be assumed to have an infinite contact resistance. Assume that the...
P1 (50 pts.) - A large plane wall has a thickness L-60 cm and thermal conductivity k 25 W/m-K. On the left surface (x-0), it is subjected to a uniform heat flux qo while the surface temperature To is constant. On the right surface, it experiences convection and radiation heat transfer while the surface temperature is TL-225°C and the surrounding temperature is 25°C. The emissivity and the convection heat transfer coefficient on the right surface are 0.7 and 15 W/m2-K,...
please help me as soon as possible
[20] SECTION B (Attempt any one Question) a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 W/mK). The temperature at the root is 500 °C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/mK. Determine the temperature distribution and rate of heat...
In stationary state operation, a transmission box receives 60 kW
for the input arrow and powers the output arrow. The box loses
energy by heat transfer at a rate defined by Newton's Cooling Law
of Q = hA (Tb-Tf), where h = 0.171 kW / m2 * K, A = 1m2 is the
surface area of the box, Tb = 300K is the external temperature and
Tf = 20ºC is the surrounding air temperature, evaluate the power
obtained from the...
a) what is the heat loss per unit length from the pipe in
W/m?
b) Estimate the heat loss per unit length if a 50 mm thick layer
of insulation with a conductivity of 0.058 W/m K. Neglect radiation
for this part.
3. A 0.20-m diameter, thin-walled steel pipe is used to transport saturated steam at a temperature of 486K in a room for which the air temperature is 25°C and convection heat transfer coefficient at the outer surface of...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago