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Thermal conductivity through a cylinder?

  1. Aug 21, 2007 #1
    1. The problem statement, all variables and given/known data

    A copper tube, of internal radius 6.959mm, overall radius 7.975mm, thickness 1.016mm, contains water at 68 deg Celsius, and is present in a room with an ambient temp of 26.65 deg Celsius. If the tube is 1000mm long, what will be the rate of heat transferred from the copper tube?
    k copper = 401 W/mK, A of tube = 0.050m, change in T=42.35 deg C, thickness =0.001016m.

    2. Relevant equations

    Q/t=kAΔT/d.... or Heat transfer across length of cylindrical tubing equation (not specifically known)

    3. The attempt at a solution

    I have entered into the Q/t=kAΔT/d equation and received an answer of about 850 000 W, or 850kW, which seems entirely unrealistic. what am I doing wrong?
  2. jcsd
  3. Aug 21, 2007 #2


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