The methyl alcohol flowing in the inner pipe of a double pipe exchanger is cooled with...
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The methyl alcohol flowing in the inner pipe of a double pipe exchanger is cooled with water flowing in the jacket. The inner pipe is made from 1-inch (25mm) schedule 40 steel pipe. The thermal conductivity of steel is 26 Btu/ft-h-°F (45 W/m-°C). The methyl alcohol enters the inner pipe at 104°F and exits at 64°F. The cooling water in the jacket of the double-pipe exchanger has a bulk temperature Tof = 41°F. The diameters and wall thickness of 1-in. Schedule 40 pipe, from Appendix 5, are 1.049 D₁ 0.0874 ft D₁ = 1.315 12 0.1096 ft 0.133 -0.0111 ft 12 12 TABLE 11.1 Data for Example 11.1 Btu/fr-F W/m²³-C 180 1020 300 1700 Alcohol coefficient A Water coefficient k Inside fouling factor h Outside fouling factor 1000 5680 500 2840 From all the given data, determine the following: 1. q, constant rate of heat transfer 2. T₁, temperature of the inner tube surface in contact with methyl alcohol 3. AT, temperature difference due to heat conduction in the inner tube. Coefficient NOTE: Uo= 71.3 Btu/ft²-h-F or 405 W/m²-C but Ao I can't find USE THIS = Uo(Tb -Tof) NOTE: Uo is based on outer surface area of the inner pipe Ao Tb Tof (Tb - Ft) + (F-7₂) + (F₂-Tof) 9 (1²4) + (192M) + (1074) = = KALM hof Ao AoUo 1 Ao Aox Au = + + Uo hDAL KALM hofa 1 Do hb Di KDLM Dox + + hof ΣR= where x = 12-₁-pipe thickness Do-D DLM = In(Do/D) The methyl alcohol flowing in the inner pipe of a double pipe exchanger is cooled with water flowing in the jacket. The inner pipe is made from 1-inch (25mm) schedule 40 steel pipe. The thermal conductivity of steel is 26 Btu/ft-h-°F (45 W/m-°C). The methyl alcohol enters the inner pipe at 104°F and exits at 64°F. The cooling water in the jacket of the double-pipe exchanger has a bulk temperature Tof = 41°F. The diameters and wall thickness of 1-in. Schedule 40 pipe, from Appendix 5, are 1.049 D₁ 0.0874 ft D₁ = 1.315 12 0.1096 ft 0.133 -0.0111 ft 12 12 TABLE 11.1 Data for Example 11.1 Btu/fr-F W/m²³-C 180 1020 300 1700 Alcohol coefficient A Water coefficient k Inside fouling factor h Outside fouling factor 1000 5680 500 2840 From all the given data, determine the following: 1. q, constant rate of heat transfer 2. T₁, temperature of the inner tube surface in contact with methyl alcohol 3. AT, temperature difference due to heat conduction in the inner tube. Coefficient NOTE: Uo= 71.3 Btu/ft²-h-F or 405 W/m²-C but Ao I can't find USE THIS = Uo(Tb -Tof) NOTE: Uo is based on outer surface area of the inner pipe Ao Tb Tof (Tb - Ft) + (F-7₂) + (F₂-Tof) 9 (1²4) + (192M) + (1074) = = KALM hof Ao AoUo 1 Ao Aox Au = + + Uo hDAL KALM hofa 1 Do hb Di KDLM Dox + + hof ΣR= where x = 12-₁-pipe thickness Do-D DLM = In(Do/D)
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Solution Solution mm Schedule 40 Inner Diameter Di 26645 Outen Diometer D 33401 mm 45 Wm... View the full answer
Related Book For
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
Posted Date:
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