A steam pipe having a surface temperature of 573 K passes through a room where the temperature is 25C. The outside diameter of pipe is 0.11 m and emissivity factor is 0.69 . Determine the radiated heat loss for a 5 m pipe length.
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Completely solve and box the final answer. Write legibly.
9. A steam pipe having a surface temperature of 573 K passes through a room where the temperature is 25C. The outside diameter of pipe is 0.11 m and emissivity factor is 0.69 . Determine the radiated heat loss for a 5 m pipe length.
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- 36 -S 42 2. Metal castings can sometimes develop a gap between the casting and mold as the molten metal hardens. The result can be a substantially altered cooling process. Set up a simple heat-transfer model that would let you look at the effect of the gap on the cooling process. Assume the casting and mold are square in shape, with an air gap of thickness das shown in the figure. The mold sits in some ambient room temperature. State clearly all assumptions and develop a corresponding model of the heat transfer problem. Assuming that the casting is aluminum, the mold is diatomaceous earth and the gap is filled with air, see if you can arrive at and summarize some insight into the effect of the gap and its size on the heat transfer process.Completely solve and box the final answer. Write legibly 3. Determine the heat loss in KW of a vertical furnace made up of inner wall of firebrick 28 cm thick followed by insulating brick 18 cm thick and an outer wall of steel 1.5 cm thick. Surface temperature of the wall adjacent to the combustion chamber is 895ºC while that of the outer surface of steel is 42ºC. Use a thermal conductivity of wall in W/m-ºK for firebrick, insulating brick and steel to be 14, 0.92, and 52 respectively. The cross section is 2.5 m x 7.5 m.Answer within 10 minutes : The temperature at the inside surface of an oven is 460 oF. The inside wall of the oven is made of brick and is 8 inch thick. The thermal conductivity of the brick is 2.2 Btu/hr.ft2.(oF/ft). The outside of the oven is covered with a 3-inch layer of asbestos as insulation, which has a thermal conductivity of 0.11 Btu/hr.ft2.(oF/ft). If the outer surface of the insulation has a temperature of 100 oF , calculate the amount of heat lost through 2 ft2 of wall area in 3 hours.
- Describe and compare the modes of heat loss through the single-pane and double-pane window assemblies shown in the sketch below.Sipho’s mother is making a fire in the stove inside a shack using coal. A fan is used to extract the flue gasfrom the fire via a chimney made of zinc material. The wall thickness of Chimney is L=4mm and the walltemperature of the chimney on the flue gas side is T_si=60˚C. Sipho, playing outside next to the chimneyexperiences an ambient temperature of 20˚C. The surrounding temperature is T_sur=35˚C and the emissivityis ε=0.95. Assume the convection coefficient is 20W/m2K and the chimney is grey material.Under these conditions determine the outer surface (air side) temperature T_so=? of the chimney.The surface of a 0.5-m diameter space probe dissipates 150 W of heat to the outside. If the probe surface emits 80% of the heat that comes from the electronic equipment inside of it and the probe does not receive radiation from other surfaces, compute for the surface emissive power in : m²°
- A fluid flowing through a tube 20ft long and of 0.62 inch inside diameter has the following has the following physical properties: specific heat = 0.65 BTU/lb degFthermal conductivity = 0.085 BTU/ hr ft degFuw = viscosity at 122 degF (tube surface temp) = 4.0 lb/ft hrub = viscosity at 212 degF (bulk fluid temp)= 1.95 lb/ ft hr What is the heat transfer coefficient (Btu/hr-ft^2-K) if the flowrate is 2000 lb/hr?a. 280b. 208c. 203d. 282A fluid flowing through a tube 20ft long and of 0.62 inch inside diameter has the following has the following physical properties: specific heat = 0.65 BTU/lb degFthermal conductivity = 0.085 BTU/ hr ft degFuw = viscosity at 122 degF (tube surface temp) = 4.0 lb/ft hrub = viscosity at 212 degF (bulk fluid temp)= 1.95 lb/ ft hr 1. What is the Reynolds number if the flowrate is 2000 lb/hr?a. 24500b. 22800c. 27200d. 25300 2. What is the heat transfer coefficient (Btu/hr-ft^2-K) if the flowrate is 2000 lb/hr?a. 280b. 208c. 203d. 282 3. If the flowrate is reduced to 100 lb/h, What would be the heat transfer coefficient (Btu/hr-ft^2-K)?a. 9b. 10c. 11d. 12A radiant-heating system is installed in the plaster ceiling of a room 36 ft long by 18 ft wide by 9 ft high. Assume direct radiation. The temperature of the concrete floor is maintained at 75°F. The temperature of the air passing through the room is held at 75°F. If the required heat supply to the floor is 8000 BTU/hr, calculate the necessary temperature at the ceiling surface. How much heat is transferred to the air, in BUT/hr? Emissivity of plaster = 0.93; absorptivity of concrete = 0.63. The convective heat-transfer coefficient between the ceiling and the air is given by the equation hc = 0.20 (AT)¹/4.