The section of a vertical wall is made up of fiberglass insulation slabs separated by wooden studs. The thermal conductivity of fiberglass and wood are 0.04 W/m-K and 0.18 W/m-K, respectively. The thickness of the wall is 160 mm. The temperatures of the inner and outer surfaces of the wall section are 22 °C and 4 °C, respectively. The ratio of the insulation area to the total wall area is 0.8. Calculate the total heat flow rate (in W/m2) through the wall per unit area. Wooden Stud ...
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- A 1-in Sch 40 stainless steel pipe with a thermal conductivity of 45 W/m-K can move 1,000 kg of saturated steam per hour at 150 °C. Refractory material 0.25 inches thick with a thermal conductivity of 0.025 W/m-K insulates the pipe. At a temperature of 25 °C, the pipe is exposed to the outside air. There is a 1135 W/m2 internal heat transfer coefficient.40 W/m2-K is the outside heat transfer coefficient, whereas -K. Suppose that only the radial direction is involved in steady-state heat transfer and that radiation effects are negligible. ✓ Determine how much heat is being lost through these pipes to the environment.a. 399.1 W/mb. 1525.0 W/mc. 618.4 W/md. 1128.7 W/me. none of the above √ How about the insulated pipe's surface temperature?a. 118.5 °Cb. None of the abovec. 101.5 °Cd. 216.3 °Ce. 292.2 °Ca 1 m-wide by 2 m-high window is composed of two 5 mm-thick glass panes, seperated by an air space of 10 mm. the temperature at the inner and outer surfaces of the window are 15 C and -20 C respectively. If the thermal conductivities of the glass pane and the air space are 1.4 w/m-k and 0.024 w/m-k, respectively. find the total conduction thermal resistance of the window in k/wConsider a wall made of Material A that is 4.5m long, 3.0m high, and 0.22m thick. The interior and exterior design temperatures are Too1 and Too2, respectively, the heat transfer coefficients on the interior and exterior surfaces are 10 and 20W / m2 •C. If insulating material is placed on the inside surface of the wall to maintain the temperature shallow from it to T1. Determine the required thickness of the insulating material.
- The temperature at the inner and outer surfaces of a boiler wall made of 25 mm thick steel and covered with an insulating material of10 mm thickness are 300 C and 50C respectively. If the thermal conductivities of steel and insulating material are 58W/mC and 0.116W/mC respectively, determine the total resistance through the boiler wall. (Note area of sample boiler wall is 8 m2)It is designed in such a way that the internal temperature of a commercial heat treatment furnace can reach up to 165 oC. All surfaces of the furnace consist of firebrick (10 cm), insulation material and sheet metal (3mm) from the inside out. Given that the outdoor temperature is 22 oC, the outer sheet will be allowed to go up to 35 oC, which is a temperature that will not be disturbed by hand contact. In this case, determine the insulation material thickness to be used. Insulation material thermal conductivity coefficient is 0.066 insulation W / m oC, 60 W / m oC for sheet metal and 115 W / m oC for firebrick. Indoor heat transfer coefficient will be accepted as 25 W / m2 oC and 12 W / m2 oC for outdoor environment.Question 4 The window of a room is made of 5 mm thick glass which has a thermal conductivity of 1.4 W/m-K. A heater is used to maintain the room temperature at 22 °C. Take the convection heat transfer coefficients on the outer surface of the window to be 12 W/m²-K. Take appropriate assumptions while solving this problem. (a) T₁=15°C TA -A- 1m x 3m = 3m², k=1.4W/m-K -T₂=5°C L=0.005m Figure Q2 Determine the heater thermal load to maintain the room temperature?
- A 4-mm and 2-m-long electric wire is tightly wrapped with a 2-mm-thick plastic cover whose thermal conductivity is k =0.1 W/m-°C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 10 V along the wire. If the insulated wire is exposed to a medium at =20 °C with a heat transfer coefficient of h=10 T. W/m2.°C, determine the temperatures T1 and T2 as shown in the figure below. Also determine whether doubling the .thickness of the plastic cover will increase or decrease T2 TA steam pipe (inner diameter = 150 mm and outer diameter = 160 mm) havingthermal conductivity 58 W/m. °C is covered with two layers of insulation, ofthickness 30 mm and 50 mm respectively and thermal conductivities 0.18 W/m. °Cand 0.09 W/m .°C respectively. The temperature of the inner surface of steam pipeis 320°C and that of the outer surface of the insulation layers is 40°C.Determine the quantity of heat lost per meter length of steam pipe and layercontact temperature,A large concrete wall is 300 mm thick and has a thermal conductivity of 1.2 W/m C. The heat flux through the wall is 100 W/m2. The higher-temperature surface of the wall is at 42 C. What is the temperature of the other surface of the wall?
- 1 mm thick copper plate (k=386 W/m-c) that are 15 cm x 20 cm in size if the thermal contact conductance on both sides of the copper plate is estimated to be 6,000 W/m-c, determine the % error involved in the total thermal resistance of the plate if the thermal contact conductance are ignored.In a coal-fired power plant, a furnace wall consists of a 125-mm-wide refractory brick and a 125-mm-wide insulating firebrick separated by an air gap. The outside wall is covered with a 12 mm thickness of plaster. The inner surface of the wall is at 1100◦C, and the room temperature is 25◦C. The heat-transfer coefficient from the outside wall surface to the air in the room is 17 W/m2 K, and the resistance to heat flow of the airgap is 0.16 K/W. The thermal conductivities of the refractor brick, the insulating firebrick, and the plaster are 1.6, 0.3, and 0.14 W/m K, respectively. Calculate the rate of heat loss per unit area of wall surfaceIt is designed in such a way that the internal temperature of a commercial heat treatment furnace can reach up to 165 oC. All surfaces of the furnace consist of firebrick (10 cm), insulation material and sheet metal (3mm) from the inside out. Given that the outdoor temperature is 22 oC, the outer sheet will be allowed to go up to 35 oC, which is a temperature that will not disturb in contact with hands. In this case, determine the insulation material thickness to be used. The thermal conductivity coefficient of the insulation material is insulation 0.066 W / m oC, 60 W / m oC for sheet metal and 115 W / m oC for firebrick. Indoor heat transfer coefficient will be accepted as 25 W / m2 oC and 12 W / m2 oC for outdoor environment.