A heat exchanger is to be designed to heat raw water by the use of condensed water at 67°C and 0.2 bar, which will flow in the shell side with a mass flow rate of 50,000 kg/hr. The heat will be transferred to 30,000 kg/hr of city water coming from a supply at 17°C (c, = 4184 J/kg K). A single shell and a single tube pass is preferable. A fouling resistance f 0.000176m ^ 2 * K/W is suggested and the surface over design should not be over 35%. A maxi- mum coolant velocity of 1.5 m/s is suggested to prevent erosion. A maxi- mum tube length of 5 m is required because of space limitations. The tube material is carbon steel ( k = mathfrak 6 W/m K). Raw water will flow inside of 3/4-in. straight tubes (19 mm OD with 16 mm ID). Tubes are laid out on a square pitch with a pitch ratio of 1.25. The baffle spacing is approximated by 0.6 of shell diameter and the baffle cut is set to 25%.The permissible maximum pressure drop on the shell side is 5.0 psi. The water outlet tem- perature should not be less than 40°C. Perform the preliminary analysis.
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A heat exchanger is to be designed to heat raw water by the use of condensed water at 67°C and 0.2 bar, which will flow in the shell side with a mass flow rate of 50,000 kg/hr. The heat will be transferred to 30,000 kg/hr of city water coming from a supply at 17°C (c, = 4184 J/kg K). A single shell and a single tube pass is preferable. A fouling resistance f 0.000176m ^ 2 * K/W is suggested and the surface over design should not be over 35%. A maxi- mum coolant velocity of 1.5 m/s is suggested to prevent erosion. A maxi- mum tube length of 5 m is required because of space limitations. The tube material is carbon steel ( k = mathfrak 6 W/m K). Raw water will flow inside of 3/4-in. straight tubes (19 mm OD with 16 mm ID). Tubes are laid out on a square pitch with a pitch ratio of 1.25. The baffle spacing is approximated by 0.6 of shell diameter and the baffle cut is set to 25%.The permissible maximum pressure drop on the shell side is 5.0 psi. The water outlet tem- perature should not be less than 40°C. Perform the preliminary analysis.
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