A novel design for a condenser consists of a tube of thermal conductivity 200W/m ? K with longitudinal fins snugly fitted into a larger tube. Condensing refrigerant at 45?C flows axially through the inner tube, while water at a flow rate of 0.012 kg/s passes through the six channels around the inner tube. The pertinent diameters are D₁ = 10 mm. D₂ = 14 mm, and D₃ = 50 mm, while the fin thickness is t = 2 mm. Assume that the convection coefficient associated with the condensing refrigerant is extremely large. Determine the heat removal rate per unit tube length in a section of the tube for which the water is at 15?C.

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