A single shell, shell and tube heat exchanger will be designed to condense 7 kg/s of...

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A single shell, shell and tube heat exchanger will be designed to condense 7 kg/s of saturated steam at 70 kPa with existing cooling water at 10-C and at a flow rate of 100 kg/s. Tubes are 25 mm outer diameter and 6 m long. The velocity of the cooling water should not exceed 2 m/s on tube side. Heat transfer coefficients for shell and tube sides are 1800 and 800 W/m-C, respectively. Calculate: a) Required number of tubes. b) Number of tube passes. Neglect the wall resistance. You can take C: 4.18 kJ/kg K; p.: 1000 kg/m. A single shell, shell and tube heat exchanger will be designed to condense 7 kg/s of saturated steam at 70 kPa with existing cooling water at 10-C and at a flow rate of 100 kg/s. Tubes are 25 mm outer diameter and 6 m long. The velocity of the cooling water should not exceed 2 m/s on tube side. Heat transfer coefficients for shell and tube sides are 1800 and 800 W/m-C, respectively. Calculate: a) Required number of tubes. b) Number of tube passes. Neglect the wall resistance. You can take C: 4.18 kJ/kg K; p.: 1000 kg/m.