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1. one wall is formed by two materials, the first one is 15cm thick and has...
A concrete wall of a house is 45 cm thick and has a surface area 20m...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
please show me the whole work for question 4) and 5),thank you so much An insulating...
please show me the whole work for question 4) and 5),thank you
so much
An insulating wall is composed of 10 cm of a material having an thermal conductivity of 5 W/m.K, and an unknown thickness of cork, which has a thermal conductivity of 0.045 W/m.K. How thick must the cork be if the heat losses through the wall are to be less than 10W/m2 when the inside temperature is 20degree C and it's -20degree C outside? Water flows through...
A 0.1 m thick brick wall with thermal conductivity 0.66 Wm K-1 is exposed to cold wind on the out...
A 0.1 m thick brick wall with thermal conductivity 0.66 Wm K-1 is exposed to cold wind on the outside of a house, at 270 K with convective heat transfer coefficient of 22.43 Wm2K1. On the inside of the house is calm air at 295.8 K, with a natural convective heat transfer coefficient of 10.49 Calculate the rate of heat transfer per unit area, in Wm, giving your answer to 3 decimal places
A 0.1 m thick brick wall with...
The surface of a furnace wall is at a temperature of 1350oC. The outside wall temperature...
The surface of a furnace wall is at a temperature of 1350oC. The outside wall temperature is 42oC. The furnace wall is made of 25 cm of refractory material having a thermal conductivity of 1.4 W/moK. The outside wall is steel, 1 cm thick with thermal conductivity of 47 W/moK. Calculate the thickness in meters of brick to be installed in between the refractory material and steel if its thermal conductivity is 0.28 W/moK and the heat loss is not...
Consider the following composite wall of a building. It is made out of plaster board (Lp...
Consider the following composite wall of a building. It is made out of plaster board (Lp 0.85 W/mK), glass fibre insulation (Lb-160 mm, k = 0.050 W/mK) and plywood (1,-40 m m, k = 0.70 W/mK) as shown below. On a certain day, the convective heat transfer coefficients inside and outside of the building are 35 W/m2K and 65 W/m2 K respectively. The inside and outside temperatures are 24°C and 36°C respectively. The wall has a total surface area of...
Consider a 4 m high, 6 m wide and 0.17 m thick wall whose thermal conductivity is k = 0.8 W/m.oC....
Consider a 4 m high, 6 m wide and 0.17 m thick wall whose thermal conductivity is k = 0.8 W/m.oC. On a certain day, the temperatures of the inner and the outer medium close to the wall are measured to be 14oC and 6oC, respectively. Both inner and outer surfaces are subjected to convection heat transfer. Assume that the convection heat transfer coefficient is the same for the two surfaces h = 5 W/m2 ∙ °C. 1. Draw the...
Heat Transfer Problems 1. A window pane (1/8 inch thick) in an old house owned by...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
Due to a particularly cold day, water that was transported to outdoor equipment through an uninsulated,...
Due to a particularly cold day, water that was transported to outdoor equipment through an uninsulated, thin-walled metal pipe began to freeze, which caused a cylindrical ice layer, 4 mm thick, to form on the inside of the pipe. If the pipe is 100 mm diameter with an internal convective coefficient of h = 1400 W/m2- K and a mean water temperature, Tm = 277 K, and the temperature of the inner surface of the ice, Tsi, is 273 K,...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
please show me the whole work for question 4) and 5),thank you
so much
An insulating wall is composed of 10 cm of a material having an thermal conductivity of 5 W/m.K, and an unknown thickness of cork, which has a thermal conductivity of 0.045 W/m.K. How thick must the cork be if the heat losses through the wall are to be less than 10W/m2 when the inside temperature is 20degree C and it's -20degree C outside? Water flows through...
A 0.1 m thick brick wall with thermal conductivity 0.66 Wm K-1 is exposed to cold wind on the outside of a house, at 270 K with convective heat transfer coefficient of 22.43 Wm2K1. On the inside of the house is calm air at 295.8 K, with a natural convective heat transfer coefficient of 10.49 Calculate the rate of heat transfer per unit area, in Wm, giving your answer to 3 decimal places
A 0.1 m thick brick wall with...
Consider the following composite wall of a building. It is made out of plaster board (Lp 0.85 W/mK), glass fibre insulation (Lb-160 mm, k = 0.050 W/mK) and plywood (1,-40 m m, k = 0.70 W/mK) as shown below. On a certain day, the convective heat transfer coefficients inside and outside of the building are 35 W/m2K and 65 W/m2 K respectively. The inside and outside temperatures are 24°C and 36°C respectively. The wall has a total surface area of...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
Due to a particularly cold day, water that was transported to outdoor equipment through an uninsulated, thin-walled metal pipe began to freeze, which caused a cylindrical ice layer, 4 mm thick, to form on the inside of the pipe. If the pipe is 100 mm diameter with an internal convective coefficient of h = 1400 W/m2- K and a mean water temperature, Tm = 277 K, and the temperature of the inner surface of the ice, Tsi, is 273 K,...
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