Homework Answers
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...
PROBLEM 5-8 points You are making iced tea. The tea itself is initially at a temperature...
PROBLEM 5-8 points You are making iced tea. The tea itself is initially at a temperature of 50.0 °C. You then toss in an ice cube with a mass of 50 and an initial temperature of -20.0 °C. The ice cube melts, and the final temperature of the mixture is +30.0 °C. For this problem, use the following values: c for liquid water is 4000 J/(kg "C), c for solid water is 2000 J/(kg°C), and the latent heat of fusion...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) i...
H8-1: An 8-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 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
Problem #3 (30 point): A glass-door fire-screen has a height of 0.8 m and a width...
Problem #3 (30 point): A glass-door fire-screen has a height of 0.8 m and a width of 1.1 m and a temperature of 280°C. The room temperature is 24°C. (a) Estimate the convection heat transfer from the fireplace to the room. Use Churchill and Chu correlation. Is the flow laminar or turbulent. (b) Calculate also the radiation heat transfer from the fire-screen to the room. Assume, emissivity of fire-screen, E: 0.95. Assume, for air at T-425 K: v= 29.4x10m/s, k...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
(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...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m2 °C and h...
The front surface of the glass cover of a flat plate solar collector of dimensions 1...
The front surface of the glass cover of a flat plate solar collector of dimensions 1 m x 1 m has a temperature of 40°C. The collector loses heat by convection to atmospheric air at temperature 14°C. For a wind speed of 5 m/s blowing along and parallel to the glass cover, determine the rate of heat loss by convection. Calculate the net heat loss from the glass cover due to radiation exchange with blackbody surroundings at temperature 7°C if...
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conduc...
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside- surface temperature is 32 °C and the inside-surface temperature is 24°c. Calculate the rate of heat transfer, in watts, through a plane of window glass, giving your answer to 3 decimal places.
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside-...
A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed ...
A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed in a quiescent environment at 4°C. Find the cooling rate (q). End effects (heat transfer from the two ends of the cylinder) are negligible. The following relation (Churchill and Chu) for Nusselt number can be used. Air (T-288.5K): v=14.87x10° m2/s, k=0.0254 w/m-K, α=21.0x10-6 m2/s, Pr-0.71, B-3.47x1031/K. 1. Quiescent air 7,-4°C 0.06 m diameter T 27 C L=1m MUD 10.60 +...
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...
PROBLEM 5-8 points You are making iced tea. The tea itself is initially at a temperature of 50.0 °C. You then toss in an ice cube with a mass of 50 and an initial temperature of -20.0 °C. The ice cube melts, and the final temperature of the mixture is +30.0 °C. For this problem, use the following values: c for liquid water is 4000 J/(kg "C), c for solid water is 2000 J/(kg°C), and the latent heat of fusion...
H8-1: An 8-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 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
Problem #3 (30 point): A glass-door fire-screen has a height of 0.8 m and a width of 1.1 m and a temperature of 280°C. The room temperature is 24°C. (a) Estimate the convection heat transfer from the fireplace to the room. Use Churchill and Chu correlation. Is the flow laminar or turbulent. (b) Calculate also the radiation heat transfer from the fire-screen to the room. Assume, emissivity of fire-screen, E: 0.95. Assume, for air at T-425 K: v= 29.4x10m/s, k...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
(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...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m2 °C and h...
The front surface of the glass cover of a flat plate solar collector of dimensions 1 m x 1 m has a temperature of 40°C. The collector loses heat by convection to atmospheric air at temperature 14°C. For a wind speed of 5 m/s blowing along and parallel to the glass cover, determine the rate of heat loss by convection. Calculate the net heat loss from the glass cover due to radiation exchange with blackbody surroundings at temperature 7°C if...
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside- surface temperature is 32 °C and the inside-surface temperature is 24°c. Calculate the rate of heat transfer, in watts, through a plane of window glass, giving your answer to 3 decimal places.
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside-...
A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed in a quiescent environment at 4°C. Find the cooling rate (q). End effects (heat transfer from the two ends of the cylinder) are negligible. The following relation (Churchill and Chu) for Nusselt number can be used. Air (T-288.5K): v=14.87x10° m2/s, k=0.0254 w/m-K, α=21.0x10-6 m2/s, Pr-0.71, B-3.47x1031/K. 1. Quiescent air 7,-4°C 0.06 m diameter T 27 C L=1m MUD 10.60 +...
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