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In a 1-1 pass floating head type shell and tube heat exchanger, the tubes (od = 25 mm; id = 21 mm) are arranged in a square pitch. The tube pitch is 32 mm. The thermal conductivity of the shell side fluid is 0.19 W/mK, and the Nusselt is 200. The shell-side heat transfer coefficient (in W/m$^{2}$.K), rounded off to the nearest integer, is

  1. 1100
  2. 1400
  3. 1800
  4. 2100
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