Ice crates with the following dimensions: length = 30 cm, width = 40 cm, and height...
Ice crates with the following dimensions: length = 30 cm, width = 40 cm, and height = 30 cm, made of 3 cm thick insulation material (k = 0.033 W / [m ° C]). Inside the crate is filled with 10 kg of ice at 0 ° C. The inner surface temperature of the ice cube is assumed to be constant at 0 ° C. The latent heat of the ice melting is 333.2 kJ / kg. The outer surface temperature of the crate is assumed to be constant at 25 ° C. How long does it take for the whole ice to melt? Assume heat transfer through the lower surface is ignored. The length of time ES melts = hour.
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Ice crates with the following dimensions: length = 30
cm, width = 40 cm, and height...
An ice chest 50 cm long by 40 cm wide by 30 cm high comprised of...
An ice chest 50 cm long by 40 cm wide by 30 cm high comprised of 3 cm thick Styrofoam having thermal conductivity k = 0.033 W/m°C is filled with ah ice/ water mixture containing 45 kg of ice. The ice / water mixture is separated from the lid by 1 cm of air. The temperature of the surrounding air and the surface on which the ice chest is resting is 30° C, The temperature of the inner surface of...
The dimensions of ice box cooler are 40 x 40 x 40 cm. Each wall is...
The dimensions of ice box cooler are 40 x 40 x 40 cm. Each wall is 4.5 cm thick and is made of plastic. If outside temperature is 24 0 C and icebox maintains interior temperature is 00 C . Thermal conductivity of plastic, k = 0.032 W/(K. m).. How much ice melts in 2 hours?
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O ,...
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O , D; = 5 m 1.5 cm T = 0°C A 5-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/( m K )) is used to store iced water at 0°C. The tank is located in a room whose temperature is 30°C. The walls of the room are also at 30°C. Heat transfer between the outer surface of the tank and the...
QUESTION 8 How does the internal energy of the ice and water mixture change if the...
QUESTION 8 How does the internal energy of the ice and water mixture change if the temperature does not rise while the ice is melting? It decreases, because you need to use energy to make a freezer run, but ice melts spontaneously. No enough information to determine. It increases, because it takes more energy for water molecules to be disordered than to be ordered. It remains the same, because both are at the same temperature. QUESTION 9 Suppose you start...
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...
(Chap 3- Heat conduction in cylinders and spheres) An 8-m-internal diameter spherical tank made of 1.5-cm-thick...
(Chap 3- Heat conduction in cylinders and spheres) An 8-m-internal diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15W/m-K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The walls of the room are also at 25°C. The outer surface of the tank is black (emissivity1), and heat transfer between the outer surface of the tank and the surroundings is by natural convection and radiation. The convection heat...
26. Figure shows a thick shell made of electrical conductivity,Ơ and has inner & outer radii...
26. Figure shows a thick shell made of electrical conductivity,Ơ and has inner & outer radii of 10 cm & 20 cm respectively and is filled with ice inside it. Its inside and outside surface are kept at different potentials by a battery of kept at different potentials by a battery of internal resistance 2 & -5, Find value of Ơ for w maximum possible rate if 25% of heat generated by shell due to joule heating is used to...
z=27 b. A glass vessel with an insulating cover with a surface area of (2 +...
z=27
b. A glass vessel with an insulating cover with a surface area of (2 + 100) cm² and (Z +15) mm thick is filled with ice at 0°C and placed in a second vessel maintained at a temperature of 100°C. Find the mass of the ice that melts per minute when the flow of heat becomes steady. Latent heat of ice = 3.3 x 105J/kg and K for glass = 1.0 W/mK. (10 Marks)
9. Bilbo lives in a rectangular home, 10.0m (width) x 16.0m (length) x 10.0m (height), which...
9. Bilbo lives in a rectangular home, 10.0m (width) x 16.0m (length) x 10.0m (height), which he maintains at a constant temperature of 23.0°C year round. Each of the outer walls, including the roof, has two sandwiched layers of uniform thickness: wood (2.0cm) and fiberglass insulation (14.5cm). Note: The thermal conductivities can found in the UsefulPhysicalQuantities file in D2L. Bilbo's House i. Determine the total surface area of Bilbo's house, excluding the floor. For simplicity, assume that the windows and...
5-111 Consider a refrigerator whose outer dimensions are 1.80 m x 0.8 m × 0.7 m....
5-111 Consider a refrigerator whose outer dimensions are 1.80 m x 0.8 m × 0.7 m. The walls of the refrigerator are constructed of 3-cm-thick urethane insulation (k = 0.026 W m K and α = 0.36 × 10-6 m2/s) sandwiched between two layers of sheet metal with negligible thickness. The refrigerated space is maintained at 3°C and the average heat transfer coefficients at the inner and outer surfaces of the wall are 6 W/m2 K and 9 W/m2.K, respectively....
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O , D; = 5 m 1.5 cm T = 0°C A 5-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/( m K )) is used to store iced water at 0°C. The tank is located in a room whose temperature is 30°C. The walls of the room are also at 30°C. Heat transfer between the outer surface of the tank and the...
QUESTION 8 How does the internal energy of the ice and water mixture change if the temperature does not rise while the ice is melting? It decreases, because you need to use energy to make a freezer run, but ice melts spontaneously. No enough information to determine. It increases, because it takes more energy for water molecules to be disordered than to be ordered. It remains the same, because both are at the same temperature. QUESTION 9 Suppose you start...
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...
(Chap 3- Heat conduction in cylinders and spheres) An 8-m-internal diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15W/m-K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The walls of the room are also at 25°C. The outer surface of the tank is black (emissivity1), and heat transfer between the outer surface of the tank and the surroundings is by natural convection and radiation. The convection heat...
26. Figure shows a thick shell made of electrical conductivity,Ơ and has inner & outer radii of 10 cm & 20 cm respectively and is filled with ice inside it. Its inside and outside surface are kept at different potentials by a battery of kept at different potentials by a battery of internal resistance 2 & -5, Find value of Ơ for w maximum possible rate if 25% of heat generated by shell due to joule heating is used to...
z=27
b. A glass vessel with an insulating cover with a surface area of (2 + 100) cm² and (Z +15) mm thick is filled with ice at 0°C and placed in a second vessel maintained at a temperature of 100°C. Find the mass of the ice that melts per minute when the flow of heat becomes steady. Latent heat of ice = 3.3 x 105J/kg and K for glass = 1.0 W/mK. (10 Marks)
9. Bilbo lives in a rectangular home, 10.0m (width) x 16.0m (length) x 10.0m (height), which he maintains at a constant temperature of 23.0°C year round. Each of the outer walls, including the roof, has two sandwiched layers of uniform thickness: wood (2.0cm) and fiberglass insulation (14.5cm). Note: The thermal conductivities can found in the UsefulPhysicalQuantities file in D2L. Bilbo's House i. Determine the total surface area of Bilbo's house, excluding the floor. For simplicity, assume that the windows and...
5-111 Consider a refrigerator whose outer dimensions are 1.80 m x 0.8 m × 0.7 m. The walls of the refrigerator are constructed of 3-cm-thick urethane insulation (k = 0.026 W m K and α = 0.36 × 10-6 m2/s) sandwiched between two layers of sheet metal with negligible thickness. The refrigerated space is maintained at 3°C and the average heat transfer coefficients at the inner and outer surfaces of the wall are 6 W/m2 K and 9 W/m2.K, respectively....
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