Consider a small double pipe heat exchanger. Hot air flows
in the inner and cold water in the outer pipe. The heat exchanger is well
insulated. The inner pipe is thin and made of copper tubing. Use the given data
to find the required heat exchanger length. Data: Inner pipe diameter: 3 cm,
wall thickness: 2 mm, outer pipe diameter: 6 cm, Pair = 1 atm, mair
= 1 kg/s, mwater = 2 kg/s, total rate of heat transfer: 20 kW,
average air temperature: Tair = 450 C, average water temperature: Twater
= 160 C, water pressure 5 atm.
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