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
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- 1. 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.c) 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 zzzzzzzzTask 3 Air at atmospheric pressure and a mean temperature of 327ºC flows through a steel pipe of internal diameter 100 mm and external diameter 120 mm as shown in figure 1. The ambient temperature is 20ºC. (a) Determine the rate of heat loss per meter length of pipe. (i) when uninsulated. (ii) when insulated with 50mm of insulator. (b) Calculate the surface temperature of the insulation. Thermal conductivity of steel ks = 45 W/(mK) Thermal conductivity of insulation k= 1.15 W/(m K) Inner convective heat transfer coefficient for steel h₁ = 14.27 W/(m²K) Outer convective heat transfer coefficient for steel hos= 15 W/(m²K) Outer convective heat transfer coefficient for insulation hoi = 9 W/(m² k) hoi ki 13 r₁-50mm 0₁=327°C ₂-60mm h₁ Mos OR=20°C figure 1 - Pipe & Insulation section
- 6. Air flows at 120 o C in a thin-walled tube (k = 18 W/m o C) with h = 65 w/m 2 - o C. The inside diameter of the tube is 2.5 cm tand the thickness is 0.4 mm. The tube is exposed to an environment with h = 6.5 W/m 2 - o C and temperature of 15 o C. Calculate the the heat loss for 1 m length. What thickness of insulation having k = 40 W/m- 0 C should be added to reduce heat loss by 90 %.Industrial pipes One of the ways to keep a pipe warm is by means of a steam tracer, through which an electrical resistance is used around the pipe and in a helical shape throughout its diameter?2. A steam line is covered with two successive layers of insulation. The 1.6 in thick layer in contact with the pipe is asbestos which is covered with a 1.4 inch thickness of magnesia insulation. The internal pipe diameter is 3 in, the pipewall thickness is 0.40 in made from common brick. The steam temperature is 850ºF, and the internal surface film coefficient is 50 Btu/hr.ft².F, while the ambient outer temperature is 105°F and the outer surface film coefficient is 3.0 Btu/hr.ft².F. Calculate the following: a. value of U based upon the external area of the magnesia covering, Btu/hr.ft2.F b. heat loss from the steam for a length of 190 feet of pipe, Btu/hr
- A square isothermal chip is of width 5mm on a side mounted in a substrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of coolant at 15C. From reliability considerations, the chip temperature must not exceed 85C. If air is used as a coolant, h = 200W/m2. If a dielectric liquid is used as coolant, h = 3000W/m2. What is the difference in maximum allowable power through the chip between the two coolants? (answer in W) *04. Airflow through a long. 0.2m square air conditioning duct maintains the outer duct surface temperature at 10 °C. If the horizontal duct is uninsulated and exposed to air at 35 °C as shown in the figure below, what is the heat gain per unit length of the duct? Air, Too-35°C NW-0.2m H=0.2 m -T₂-10°C8.21 WP In the final stages of production, a pharmaceutical is sterilized by heating it from 25 to 75°C as it moves at o.2 m/s through a straight thin- walled stainless steel tube of 12.7-mm diameter. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the tube. If the tube is 10 m long, what is the required heat flux? If fluid enters the tube with a fully developed velocity profile and a uniform temperature profile, what is the surface temperature at the tube exit and at a distance of o.5 m from the entrance? Fluid properties may be approximated as p = 1000 kg/m³, c, = 4000 J/kg · K, µ = 2 × 10-3 kg/s · m, k = 0.8 W/m · K, and Pr = 10.
- Define: a. Convection heat transfer coefficient b. Loss of pressure across the tube arrangement *)Based on image below:1. Saturated steam at 500 K flows in a 0.20 m inside diameter, 0.21 m outside diameter pipe. The pipe is covered with 0.075 m of insulation with a thermal conductivity of 0.10 W/m-K. The pipe's conductivity is 52 W/m-K. The ambient temperature is 300 K. The unit convective coefficients are hi = 18,000 W/m²-K and ho 12 W/m²-K. Determine the heat loss (kJ/min) from 5 m of pipe.A vertical tube of 1m length is exposed to atmospheric steam. The mass of steam condensedper hour is 125 kg/h , calculate tube diameter ?( the wall temperature is 70 oC