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A wall exactly like the one described in Table construction 1, has dimensions of
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- Activity: compile 1 example for each topic: explain: 1. Conductive heat flow through flat surface2. Conductive heat flow throw composite wall3. Conductive heat flow through thick walled tube4. CONDUCTED HEAT FLOW THROUGH THICK SPHERE5. Heat transfer between two fluids separated by walls of a composite tube of solid materials6. Absorption, reflection and transmissionarrow_forwardc) A steel pipe of 100 mm bore, and 10 mm bore thickness, carrying dry saturated steam at 28 bars, is insulated with a 40 mm layer of moulded insulation. This insulation in turn is insulated with a 60 mm layer of felt. The atmospheric temperature is 15 °C. Calculate: (i) the rate of heat loss by the steam per metre pipe length. (ii) the temperature of the outside Dimensions in mm surface.zzzzzzz h₂-15 W/m²K Steel k₁=50 W/mK AVALEHT Ø100 1₂ " Steam 28 bar h-550 W/m²K, Inner heat transfer coefficient = 550 W/m² K Outer heat transfer coefficient = 15 W/m² K Thermal conductivity of steel = 50 W/m K Thermal conductivity of felt = 0.07 W/m K Moulded insulation Felt Moulded insulation K₂=0.09 W/mK Thermal conductivity of moulded insulation = 0.09 W/m 40 10. A 60 15°C Felt K₁=0.07 W/mK zzzzzzzzarrow_forward1. A composite furnace wall is made up of a 12-in. lining of magnesite refractory brick, a 5-in.thickness of 85% magnesia, and a steel casing 0.10-in. thick. Flue gas temperature is 2200 F andthe boiler room is at 80 F. Gas side film coefficient is 15 Btu/hr-sq.ft-F and air side is 4.0.Determine:a. The thermal current Q/Ab. Interface temperaturesc. Effect on thermal current and inside refractory wall temperature if the magnesia insulation weredoubled.arrow_forward
- Mild steel nails were driven through a solid wood wall consisting of two layers, each 15 mm thick, for reinforcement. If the total cross- sectional area of the nails is 0.75% of the wall area, determine the unit thermal conductance of the composite wall, total heat flow, heat flow through the nail alone and the percent of the total heat flow that passes through the nails when the temperature difference across the wall is 35'C. Neglect contact resistance between the wood layers. Wood (Pine) (ky) = 0.15 W/(m K); Mild steel (1% C) (kg) = 43 W/(m K) а. ANSWER: W/m²-K b. ANSWER:arrow_forwardProject 3: It is vital to optimize the heat loss from a house through well designed composition and proper selection of the insulation layer of the wall layers. Your role as a thermal power engineer to investigate the heat transfer performance of a composite walls. Your head of department asked you to analyze the composite walls structure in Figure.3 and determine the steady rate of heat transfer and total heat loss, if the following design specifications must be met: _Indoor room temperature must be maintained at 20??. − Outdoor temperature mostly is -10?? in a hard winter. − Wall is made of plywood with thermal conductivity constant of ?? = 0.115 ?/(?.?) . − Fiberglass insulation is used with thermal conductivity constant of ?? = 0.045 ?/(?.?) . − Plaster board is used as inner layer for decoration purpose with thermal conductivity constant of ?? = 0.27 ?/(?.?) . − Convection heat transfer coefficients for indoor and outdoor are ℎ?? = 34 ?/(?2.?) and ℎ?? = 65 ?/(?2.?) , respectively.…arrow_forwardTask 1 Calculate the heat transfer rate for the following composite wall configurations: (A) Consider a composite plane wall that includes a 10 mm-thick hardwood siding, 50-mm by 120- mm hardwood studs on 0.7m centres with glass fiber insulation (paper faced, 28 kg/m³), and a 15 mm layer of gypsum wall board. What is the thermal resistance per unit area associated with this wall (having 10 studs, each 2.5 m high). In addition, given the temperature at the inlet and outlet surface is 20 °C and -15 °C, calculate the heat transfer rate though this wall. stud insulation 50mm wood Siding 120mm → wall boardarrow_forward
- An eyed plate & pin is assembled as illustrated and are subjected to an opposing force of 10KN. The rod diameter & plate thickness is 6mm. The width of the plate is 20mm. A hole to which the pin is inserted is 8mm in diameter is located at the center of the plate. The plate is made of annealed SAE 1025 & the pin is high-heat oil quenched SAE 1095. (a) Determine if the assembly is safe to use; otherwise (b) Determine the safe load of the assembly.arrow_forwardQUESTION 23 A wall facing southwest has a window area of 400 ft4. The window glass is 1/4 in single heat absorbing type glass with translucent roller shades. The building is heavy weight construction ands is located in Philadelphia. Find the solar cooling load in June at 4:00 pm solar time. O 18,800 BTU/hr O 28,400 BTU/hr 30,100 BTU/hr O 35,300 btu/HRarrow_forwardDetermine the heat flux through the composite walls as shown in Figure. The frontal area (normal to heat flow) for the layers of Fir brick and Brick is 1 sq.m. The frontal area for Asbestos and Earth layers are equal and the summation of the frontal areas of them is 1 sq.m. as shown required to answer. OPTIONS: 1.Heat flux is around 487.3 Watt 2.Heat flux is around 742.7 Watt 3.Heat flux is around 305.4 Watt 4.Nonearrow_forward
- Qigihar House in Heilongiiang Province, China Heat Loss Problems, BSCl 2101 Climate: Avg. remperature is 3.2°C Degree Days is 5000 Inside Air Temp. is 20°C Wall Construction, Inside to Out: 15mm Gypsum Plaster, Sand Aggregate Concrete Block, rectangular core, Sand and Gravi 15mm Cement Plaster, Sand Aggregate All 4 walls measure the same, 8m wide by 7mtall. The house is heated with electricity at a cost of $0.10kWh Calculate the RSI-total for the walls using the tabular method demonstrated in class, and the temperature drop through each element for the January 2.5% temperature. Calculate the rate of heat flow through the wall again for the January 2.5% temperature. Plot the temperature profile approximately to scale through a vertical cross-section of the wall. Calculate the January heating cost for the building. Calculate the annual heating cost for the building. Now add 2" ( 50.8mm ) of extruded polystyrene, smooth skin surface, 35kgm3 rigid insulation to the inside surfaces…arrow_forwardQuestion 1 A composite component is comprised of a tube and a concentric rod running inside it, both with a length of 1.5 meters. The tube is made of copper and has inner and outer diameters of 60 mm and 100 mm, respecti vely, a coefficient of thermal expansion and elastic modulus of 17 x10-6C and 117 GPa, respectively. The rod is made of aluminium with a diameter, coefficient of thermal expansion and elastic modulus of 50 mm, 23 x10-6C and 80 GPa, respectively. If the composite is exposed to a temperature rise of 120°C, determine: The sense and magnitude of the stresses induced in the composite if it is not restrained. 1.1 1.2 The sense and magnitude of the stresses induced in the composite ifit is partially restrained with an allowed free expansion of 0.3 mm.arrow_forwardThe Diamond Ring Solution. The processing chip on the computer that controls the navigation equipment on your spacecraft is overheating. Unless you fix the problem, the chip will be damaged and the navigation system will shut down. You open the panel and find that the small copper disk that was supposed to bridge the gap between the smooth top of the chip and the cooling plate is missing, leaving a 2.0 mm gap between them. In this configuration, the heat cannot escape the chip at the required rate. You notice by the thin smudge of thermal grease (a highly thermally conductive material used to promote good thermal contact between surfaces) that the missing copper disk was 2.0 mm thick and had a díameter of 1.2 cm. You know that the chip is designed to run below 65 °C, and the copper cooling plate is held at a constant 5.0 °C. (a) What was the rate of heat flow from the chip to the copper plate when the original copper disk was in place and the chip was at its maximum operating…arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning