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- Suppose a 3 in schedule 80 steel pipe is covered with 1 in of an insulation havingk = 60 mW/moC and the outside of the insulation is exposed to an environmenthaving h = 10 W/m2oC and Tf = 20oC. The temperature of the inside of the pipe is250oC. For unit length of the pipe calculate (a) the overall thermal resistance and(b) the heat loss (in Watts).1. For a steam pipe with a given diameter of 10 cm covered by two (2) layers of insulation. The first insulation has a thickness of 4 cm and a coefficient of thermal conductivity of 0.08 W/m.K. and the second insulation has a thickness of 3 cm and a thermal conductivity of 0.15 W/m.K. The steam main conveys steam at a pressure of 1.70 MPa with 25°C superheat. Outside temperature is 27°C. The pipe is 30 meters in length. (tsat @ 1.70 MPa = 204°C). Determine the following: a) The heat loss in KW b) Explain the concepts/principles that were considered and the factors that affected the condition of the above mentioned items (a & b).A certain insulation has a thickness of 2 cm. What thermal conductivity in W/m • *C is necessary to effect a temperature drop of 500 *C for a heat flow of 400 W/m2?
- Find the rate of heat transfer if the cylinder in a stainless steel rod.k = 15 W/m·K (8.7 Btu/h·ft·F), L = 1 m (3.3 ft), Th = 200 C (392 F), Tc= 100 C(212 F), A = 5 cm2 (0.8 in2).An electric wire having a diameter of 1.5 mm and covered with a plastic insulation (thickness = 2.5 mm) is exposed to air at 300 K and ho = 20 W/m2.K. The insulation has a thermal conductivity (k) of 0.4 W/m.K.Assuming the wire surface temperature is constant at 400 K and is not affected by the coveringa) Calculate the value of the critical radius.b) Calculate the heat loss per meter of wire length with no insulation.c) Calculate the heat loss per meter of wire length with insulation. p.s Could you write the solution clearly? It is hard to understand when written in text. A paper photo with solution would be better. Thanks in advance50 mm 10 mm Q9: A spherical container holding a cryogenicfluid at – 140°C and having an outer diameter of 0.4 m is insulated with three layers each of 50 mm thick insulations of kl = 0.02, k2 = 0.06 and k3 = 0.16 W/m. K (starting from the inside). The outside is exposed to air at 30°C with h 15 W/m.K. Determine the heat gain and the various surface temperatures. k-0.16 Wimk K0.06 Wimk k, = 0.02 Wimk h 15 Wim'k - 140°C T=30°C Q10: A furnace wall is three layers, the first layer of insulation brick of 12 cm thickness of conductivity 0.6 W/m. K. The face is exposed to gases at 870°C with a convection coefficient ofl 10 W/m.K. This layer is backed by a 10 cm layer of firebrick of conductivity 0.8 W/m. K. There is a contact resistance between the layers of 2.6 x 10 m °C/W. The third layer is the plate backing of 10 mm thickness of conductivity 49 W/m. K. The contact resistance between the second and third layers is 1.5 x 10 m².°C/W. The plate is exposed to air at 30°C with a convection…
- Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 100 Wm? C. The convection coefficient on the outside is 10 W/n C. The pipe is covered with a layer of asbestos. 1-determine the thickness of the asbestos layer at the critical insulation radius of the pipe. 2-calculate the change percent of heat transfer with and without the insulation. 3-commet on your results,Q1/ A copper tube (K =385 W/m.°C ) with ( 30 mm) inner diameter and ( 5 cm) outer diameter is covered with ( 20 mm) layer of asbestos insulation (K =0.74 W/m.°C ) followed by (3 cm) layer of fiber glass insulation (K =0.038 W/m.°C ). The inside tube wall temperature is ( 520 °C) and the outside insulation temperature is ( 45 °C). Calculate the interface temperature between the asbestos and fiber glass.A pipe covered with insulating material has inner diameter 0.1 m and outer diameter 0.11m. Assume k=1W/ mK, h=8W/mʼK, the temperature of fluid inside the pipe is 100°C and surroundings temperature is 20°C. The critical radius of insulation (in m) is
- A boiler furnace wall must have a heat loss no greater than 700 Btu/hr~ft2 and is madeof a material with a thermal conductivity of 0.60 Btu/hr~ft~F. The inner wall surfacetemperature is '2000°F, and the outer surface temperature is 800°F. What wall thick~ness is required?4. A wall of thickness 10cm conducts heat at rate of 30W/m² when the temperature difference across wall is 10K. What is thermal conductivity (W/mK)An electric wire having a diameter of 1.5 mm and covered with a plastic insulation (thickness = 2.5 mm) is exposed to air at 300 K and ho=20 W/m2.K. The insulation has a thermal conductivity (k) of 0.4 W/m.K. Assuming the wire surface temperature is constant at 400 K and is not affected by the covering a)Calculate the value of the critical radius. b)Calculate the heat loss per meter of wire length with no insulation. c)Calculate the heat loss per meter of wire length with insulation.