An iron cookie sheet with a thickness of 1 mm is in an oven at 375F....
An iron cookie sheet with a thickness of 1 mm is in an oven at 375F. It is removed from the oven and cooled under conditions with heat transfer coefficient of 10 W/(m2K). How long should you wait before touching the sheet with your hands (e.g., temperature below 100F)?
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An iron cookie sheet with a thickness of 1 mm is in an oven at
375F....
5.11 A flaked cereal is of thickness 2L = 1.0 mm. The density, specific heat, and...
5.11 A flaked cereal is of thickness 2L = 1.0 mm. The density, specific heat, and thermal conductivity of the flake are p = 700 kg/m?, c, = 2400 J/kg • K, and k = 0.34 W/ m K , respectively. The product is to be baked by increasing its temperature from T; = 20°C to Tf = 220°C in a con- vection oven, through which the product is carried on a conveyor. If the oven is Lo = 4...
Pheat the oven to 350 degrees faranheit. Spray a cookie sheet with nonstick spray. Rolle the...
Pheat the oven to 350 degrees faranheit. Spray a cookie sheet with nonstick spray. Rolle the previously regigeested cookie fough into 1-inch balls. Arrange in fhe cookie sheet 2 inches apart. When the oven is hot, bake for 12 to 15 minutes or until golden brown. Transfer to a cooking rack for 5 minutes before eating. Which of the following steps should the baker take immideately before rolling the cookie dough into balls? A. Arrange on the cookie sheet 2...
Circular pipe of 23.9 mm OD and 1.5 mm wall thickness and length 90 mm is...
Circular pipe of 23.9 mm OD and 1.5 mm wall thickness and length 90 mm is used as a fin on a wall at 200°C. The outside is exposed to air at 35°C with a convection coefficient of 15 W/m2K. The conductivity of the material is 45 W/mK. Determine the heat loss from the fin and also the mid section and tip temperature.
5. A flaked cereal is of thickness 2L=1.2 mm (or the characteristic length Lc = V/A=...
5. A flaked cereal is of thickness 2L=1.2 mm (or the characteristic length Lc = V/A= 0.6 mm). The density, specific heat, and thermal conductivity of the flake are p 700 kg/m3,cp = 2400J/kg K, and k = 0.34 W/m K, respectively. The product is to be baked by increasing its temperature from Ti = 20 °C to Tr = 220 °C in a convection oven, through which the product is carried on a conveyor. If the oven is Lo...
G4 Problem Statement: Circular fins of uniform cross section, with diameter of 14 mm and length 7...
G4 Problem Statement: Circular fins of uniform cross section, with diameter of 14 mm and length 70 mm are attached to the wall with surface temperature o C. The fin is made of material with thermal conductivity of 210 W/mk, and exposed to an ambient air condition of 24 °C and the convection heat transfer coefficient of 190 W/m2k. f 300 1- Plot the temperature variation for the following boundary conditions a- Infinitely long fin b- Adiabatic fin tip c-...
A spherical tank (inside diameter 950 mm, wall thickness 6 mm) made of cast iron (k...
A spherical tank (inside diameter 950 mm, wall thickness 6 mm) made of cast iron (k = 57 W m-1 K -1 ) is to be used to store a vapour/liquid mixture at 2 °C while it is waiting to be used in an industrial process. Calculate the percentage reduction in the rate of heat infiltration (compared to the case of no insulation) if the tank is covered in a 35 mm layer of insulation (k = 0.04 W m-1...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
1. You have a sheet of carbon steel with a thickness of 1 mm, a length...
1. You have a sheet of carbon steel with a thickness of 1 mm, a length of 300 mm, and width of 150 mm. You are testing it in a furnace that is flowing hot air over the sheet at 3 m/s at T 1 300 K along the length of the metal. The carbon steel is initially at 300k and has the following properties p 7850 R/ C 430 //kok, and R, 1490 W/mK. The carbon steel is sitting...
Problem 21–20 pts.: “Kitchen Oven Fiberglass Thickness” • How much fiberglass insulation (k = 0.035 W/m-K)...
Problem 21–20 pts.: “Kitchen Oven Fiberglass Thickness” • How much fiberglass insulation (k = 0.035 W/m-K) is needed to guarantee that the outer-surface temperature of a kitchen oven will not exceed 43°C? 1 The maximum air temperature of a kitchen oven to be maintained by the conventional type of thermostatic control is 290°C. The kitchen (or room) air temperature may vary from 15°C to 35°C, and the average convection heat transfer coefficient between the oven (inner and outer) surfaces and...
In many cookbooks, it is stated that a slab of steak, roasted in a convection oven,...
In many cookbooks, it is stated that a slab of steak, roasted in a convection oven, is considered "well-done" when the center-line temperature of the slab reaches 80 °C. A slab of steak is initially at 6 °C before it is placed in the oven, in which the ambient air temperature is 175 °C. The mean convective heat transfer coefficient between the slab of steak and the air inside the oven 15 W/(m2.K) Approximate the slab of steak as a...
5.11 A flaked cereal is of thickness 2L = 1.0 mm. The density, specific heat, and thermal conductivity of the flake are p = 700 kg/m?, c, = 2400 J/kg • K, and k = 0.34 W/ m K , respectively. The product is to be baked by increasing its temperature from T; = 20°C to Tf = 220°C in a con- vection oven, through which the product is carried on a conveyor. If the oven is Lo = 4...
5. A flaked cereal is of thickness 2L=1.2 mm (or the characteristic length Lc = V/A= 0.6 mm). The density, specific heat, and thermal conductivity of the flake are p 700 kg/m3,cp = 2400J/kg K, and k = 0.34 W/m K, respectively. The product is to be baked by increasing its temperature from Ti = 20 °C to Tr = 220 °C in a convection oven, through which the product is carried on a conveyor. If the oven is Lo...
G4 Problem Statement: Circular fins of uniform cross section, with diameter of 14 mm and length 70 mm are attached to the wall with surface temperature o C. The fin is made of material with thermal conductivity of 210 W/mk, and exposed to an ambient air condition of 24 °C and the convection heat transfer coefficient of 190 W/m2k. f 300 1- Plot the temperature variation for the following boundary conditions a- Infinitely long fin b- Adiabatic fin tip c-...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
1. You have a sheet of carbon steel with a thickness of 1 mm, a length of 300 mm, and width of 150 mm. You are testing it in a furnace that is flowing hot air over the sheet at 3 m/s at T 1 300 K along the length of the metal. The carbon steel is initially at 300k and has the following properties p 7850 R/ C 430 //kok, and R, 1490 W/mK. The carbon steel is sitting...
Problem 21–20 pts.: “Kitchen Oven Fiberglass Thickness” • How much fiberglass insulation (k = 0.035 W/m-K) is needed to guarantee that the outer-surface temperature of a kitchen oven will not exceed 43°C? 1 The maximum air temperature of a kitchen oven to be maintained by the conventional type of thermostatic control is 290°C. The kitchen (or room) air temperature may vary from 15°C to 35°C, and the average convection heat transfer coefficient between the oven (inner and outer) surfaces and...
In many cookbooks, it is stated that a slab of steak, roasted in a convection oven, is considered "well-done" when the center-line temperature of the slab reaches 80 °C. A slab of steak is initially at 6 °C before it is placed in the oven, in which the ambient air temperature is 175 °C. The mean convective heat transfer coefficient between the slab of steak and the air inside the oven 15 W/(m2.K) Approximate the slab of steak as a...
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