A industial fireclay brick wall is contructed with 0.15 m thickness (K=1.7 W/m-K). The inner and outer surface temperatures are 1400K and 1150K, respectively. Calculate the heat loss in KW through the wall with a dimension of 0.5m by 1.2m.
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- One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?Calculate the heat transfer per hour though a solid brick wall 6.9m long, 1.5m high and 216mm thick, when the outer surface is at 5.15°C and the inner surface 25°C, the coefficient of thermal conductivity of the brick being 0.6 W/m-K.Heat transfer through composite walls The wall of a refrigerated van is of 1.5 mm steel sheet at the outer surface, 10 mm plywood at the inner surface and 2 cm of glass-wool in between. Calculate the rate of heat flow if the temperatures of the inside and outside surfaces are -15⁰C and 24⁰C. Take k(steel) = 23.2 Wm-1K-1 k(glass-wool) = 0.014 Wm-1K-1 k(plywood) = 0.052 Wm-1K-1.
- The thermal conductivity coefficient of a 0.2 m thick concrete wall is known as 1.2W / (mK). Since the inner wall temperature of the concrete wall is 20C and the outer wall temperature is -5C; Calculate the heat flux lost through this wall 10m long and 3m high in W.A cold storage room has a walls constructed of 0.102-m corkboard contained between double wooden walls each 0.0127 m thick. What is the rate of heat loss if wall surface temperature is - 12.2 o C inside and 21.1 o C outside? Also what is the temperature at the interface between the outer wall and the corkboard? Values of kwood = 0.1073 W/mo C and kcorkboard = 0.0415 W/mo CA glass with an area of 0.625 m² is fit in the wooden outside wall of a room. The dimension of wall is 25 x 3.05 m , The wood has a thermal conductivity of 0.151W/m.K and is 3.05 cm thick. The glass has a thermal conductivity of 0.692W/m.K and is 5.0 mm thick. The temperature of the inside room is 27°C and outside air temperature is 268K. calculate ,What is the heat loss through wooden wall and glass window? What are the total heat loss?
- Window height (0.8 m) and width (1.5 m) consisting of two layers of glass (k = 0.78 W/m C) thickness of each layer (4mm) and separated by an air layer thickness of (10 mm) if the coefficient of thermal conductivity of static air is (k=0.026 W/mC)Calculate the rate of heat transfer through the window. If the temperature of the inside of the window is (15 C°) and the temperature of the outer surface is (8C)Explore the effect of insulation thickness on the heat loss q and the temperature of the nsulation outer surface T, 2 for a steam pipe of 0.05-m outside diameter that is insulated vith a layer of calcium silicate. The temperature of the steam fixed at 600 K and the outer surface is exposed to an airflow (T=30°C) that maintains a heat transfer coefficient of h = 85 W/m².K,which includes the effects of radiation.wherer= 0.025 m nd r2 is a variable (0.025A furnace wall consists of 100 mm thick refractory brick and 800 mm thick insulating fire brick separated by an air gap. The outside wall is covered with a 20mm thick ness of plaster. The inner surface of the wall is at 1500°C and the room temperature is at 26°C. Calculate the rate at which heat is lost per m? of the wall surface. The heat transfer coefficient from the outside wall surface to the air in the room is 22W/m²K and the resistance to heat flow of the air gap is 0.16K/W. The thermal conductivity of refractory brick, insulating fire brick and plaster are 1.5, 0.25 and 0.13 W/mK respectively. Also, calculate each interface temperature of the outside of the wall.A pin fin of 2024-T6 aluminum has a length and diameter of 8.0 cm and 6.0 mm, respectively. The base of the fin is attached to a solid state electronic device that delivers 2.50 W to the fin. If the fin is surrounded by 25°C air where the heat transfer coefficient is 30 W/m²-K, what is the temperature of the base of the fin? 2.*** **answer is correct To increase the rate of heat transfer from a device, which has 0.1 m² of exposed surface, you added 500 pin fins of 4 cm length and 2 mm diameter on top of the device's exposed surface. How much (i.e., by what factor) did the rate of total heat transfer rate (from the surface) increase? Assume that the convection coefficient is 42 W/m².K, and the thermal conductivity of the fin material is 240 W/m.K. Neglect radiation. 2:06Calculate the heat transfer per hour through a solid brick wall 6 m long, 3 m high, and 240 mm thick, when the change in temperature is equal to 15 C, the coefficient of thermal conductivity of the brick being 0.6 W/m-K.SEE MORE QUESTIONS