Steam condenses at 50°C on the tube bank consisting of 20 tubes arranged in a rectangular array of 4 tubes high and 5 tubes wide. Each tube has a diameter of 3 cm and a length of 5 m. and the outer surfaces of the tubes are maintained at 30°C. The rate of condensation of steam is
(a) 0.12 kg/s
(b) 0.28 kg/s
(c) 0.31 kg/s
(d) 0.45 kg/s
(e) 0.62 kg/s
(For water. use pl = 992.1 kg/m3,µl = 0.653 × 10−3 kg/m·s, kl = 0.631 W/m·K, cpl = 4179 J/kg-°C, hfg@Tsat = 2383 kJ/kg)
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