1 example each Conductive heat flow through thick walled tube . CONDUCTED HEAT FLOW THROUGH THICK SPHERE
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Q: When can the conductive thermal resistance of the tube in a heat exchanger be neglected in overall…
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Q: Calculate the heat loss per linear ft from 2 in. nominal pipe (2.375 in. outside diameter) covered…
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Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…
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Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…
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Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…
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1 example each
Conductive heat flow through thick walled tube
. CONDUCTED HEAT FLOW THROUGH THICK SPHERE
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- 2.51 Determine by means of a flux plot the temperatures and heat flow per unit depth in the ribbed insulation shown in the accompanying sketch.Repeat Problem 1.35 but assume that instead of surface temperatures, the given temperatures are those of the air on the left and right sides of the wall and that the convection heat transfer coefficients on the left and right surfaces are 6 and 10W/m2K, respectively.1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
- 1.41 A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on the two sides of the plate are 2700 and , corresponding to fluid temperatures of 92 and 32°C, respectively. Assuming that the thermal conductivity of the wall is , (a) compute the surface temperatures in °C and (b) calculate the heat flux in .Define Heat conduction from warm air to a cold canned drink through the wall of the aluminum can.When can the conductive thermal resistance of the tube in a heat exchanger be neglected in overall heat transfer coefficient calculation? Never When the tube is thin or the material is highly conductive When the tube is thin. When the tube material is highly conductive. Which of the following sentence(s) is/are true? We cannot calculate thermal resistance of a solid slab. Thermal resistance concept is applicable only in Cartesian or Cylindrical coordinate. We cannot calculate thermal resistance of a solid cylinder. To apply thermal resistance concept, a problem only needs to be one dimensional and steady.
- In order to reduce the heat loss through a large furnace wall, the decision has been made to add external insulation. Calculate the thickness of insulation required to reduce the heat loss by 75%. Before the change is made, no outer steel shell is used.Data: Refractory brick and wall brick:k = 0.87 W m-1 K-1Insulation: k = 0.090 W m-1 K-1•Steel: k = 43 W m-1 K-1h = 55 W m-1 K-1 (inside furnace).h = 11 W m-1 K-1 (outside furnace).Calculate the heat loss per linear ft from 2 in. nominal pipe (2.375 in. outside diameter)covered with 1 in. of an insulating material having an average thermal conductivity of0.0375 Btu/hr-ft-F. Assume that the inner and outer surface temperatures of the insulationare 380 °F and 80 °F respectively.For a flat corrugated galvanized steel (conductivity = 26 W/m.K) roof 1/32 in. thick lined with a ¼ in. asbestos-cement (conductivity = 1.2 W/m.K) ceiling 6 inches below the roof, with downward heat flow, calculate the overall thermal transmittance of the roof.
- Question 4: Water flows on the inside of a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 500 W/m2◦C. The convection coefficient on the outside is 12 W/m2 ◦C. Calculate the overall heat-transfer coefficient.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 %.Two inches of urethane foam will reduce heat loss close to 1000% when applied to a 2-inch diameter uninsulated steel pipe. Assume the pipe wall thickness is 0.25-inches, the pipe interior convective heat loss (hi) is 500 BTU/hr-ft2-oF, and the pipe outside convective heat loss ho 20 BTU/hr-ft2-oF, k steel is 25 BTU/hr-ft-oF, and k insulaton is 0.023 BTU/hr-ft-oF. (hint - calculate heat loss with and without insulation.