A layer of cork 6 inch thick is used as layer of thermal insulation in a...

A layer of cork 6 inch thick is used as layer of thermal insulation in a flat wall. The temperature of the cold side is 40 oF and that of the warm side is 180 oF. The thermal conductivity of the cork at 32 oF is 0.021 Btu/ft-h-oF and that at 200 oF is 0.032. The area of the wall is 25 ft. Estimate the rate of heat transfer through the wall. Answer: 182 Btu/hr

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samet mamat answered 2 years ago

(a) At a reclamation site, a 6-m thick sand layer overlies a 5.8-m thick clay layer,...

(a) At a reclamation site, a 6-m thick sand layer overlies a 5.8-m thick clay layer, which is underlain by impermeable rock stratum. The water level is initially 2.5 m above the ground surface. The saturated unit weights of sand and clay are 19 kN/m3 and 17 kN/m3, respectively. A 5-m thick layer of fill will be placed on the original ground surface, and the unit weights of fill are 19 kN/m3 and 20 kN/m3 above and below water table,...

A tank holds a 1.44-m thick layer of oil that floats on a 0.96-m thick layer...

A tank holds a 1.44-m thick layer of oil that floats on a 0.96-m thick layer of brine. Both liquids are clear and do not intermix. Point O is at the bottom of the tank, on a vertical axis. The indices of refraction of the oil and the brine are 1.40 and 1.52, respectively. A ray originating at O crosses the brine-oil interface at a point 0.5 m from the axis. The ray continues and emerges into the air above...

The clay layer of 6 m thick is located under the gravel ground of 12 m...

The clay layer of 6 m thick is located under the gravel ground of 12 m thick. The water table lies 4m below the ground surface. It is because the bag is 0.30 for dry gravel floor, the dry unit volume weight is 16.2 kN / m3, the undrained shear strength for clay floor is 20 kPa, 24o for friction and 17.6 kN / m3 for saturated unit volume. According to doing; Based on the shear strength of the ground...

A 20 m thick saturated clay layer is normally consolidated. At mid-depth in this layer, the...

A 20 m thick saturated clay layer is normally consolidated. At mid-depth in this layer, the void ratio (e) is 1.110, the coefficient of compressibility (av) is 5.74 x103 cm2=N. Recall that w = 9.81 kN/m3. a) Assuming that a 122 cm lowering of the ground water table (GWT) occurs in the soil overlying the clay layer, what settlement will occur in the soil overlying the clay layer because of the ultimate primary consolidation of the clay layer? Express your...

The wall of a house is made from a layer of wood 3cm thick and a...

The wall of a house is made from a layer of wood 3cm thick and a layer of wool which is 5.3 cm thick. The layer of wood faces outside and the layer of wool faces inside. The thermal conductivity of wood is 0.08W/mK and the thermal conductivity of wool is 0.02W/mK. The temperature outside the house is 0oC and the temperature inside the house is 19.8 oC. What is the temperature (in oC) at the contact surface between the...

A cylindrical steel tank is coated with a thick layer of zinc on the inside. The...

A cylindrical steel tank is coated with a thick layer of zinc on the inside. The tank is 34 cm in diameter, 61 cm high and filled to the 27 cm level with aerated water. If the corrosion current is 5.9x10-5 A/cm2, how much zinc in grams per day is being corrode PLEASE DOUBLE CHECK THE ANSWER THIS IS MY FINAL ATTEMPT< THANKS A LOT

A 5.3-cm-thick layer of oil (n=1.46) is sandwiched between a 1.1-cm-thick sheet of glass and a...

A 5.3-cm-thick layer of oil (n=1.46) is sandwiched between a 1.1-cm-thick sheet of glass and a 2.0-cm-thick sheet of polystyrene plastic (n=1.59). How long (in ns) does it take light incident perpendicular to the glass to pass through this 8.4-cm-thick sandwich? A 2.0-cm-wide diffraction grating has 1000 slits. It is illuminated by light of wavelength 570 nm . What are the angles of the first two diffraction orders?

A Circuit board needs to be covered with a layer of gold 5.00 um thick. The...

A Circuit board needs to be covered with a layer of gold 5.00 um thick. The radius of gold atom is 144 picometers(pm). How many gold atoms would be lined up to form this thickness? What is the mass?

Common practice in chemical processing plants is to clad pipe insulation with a durable, thick aluminum...

Common practice in chemical processing plants is to clad pipe insulation with a durable, thick aluminum foil. The functions of the foil are to confine the batt insulation and to reduce heat transfer by radiation to the surroundings. Because of the presence of chlorine (at chlorine or seaside plants), the aluminum foil surface, which is initially bright, becomes etched with in-service time. Typically, the emissivity might change from 0.12 at installation to 0.36 with extended service. For a 300-mm-diameter foil-covered...

A carpenter builds an exterior house wall with a layer of wood 3.0 cm thick on...

A carpenter builds an exterior house wall with a layer of wood 3.0 cm thick on the outside and a layer of Styrofoam insulation 2.0 cm thick on the inside wall surface. The wood has k=0.080W/(m⋅K), and the Styrofoam has k= 0.010 W/(m⋅K). The interior surface temperature is 20.0 ∘C , and the exterior surface temperature is -12.0 ∘C What is the rate of heat flow per square meter through this wall?

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