A double pass water-cooled shell-and-tube type condenser has a total number of tubes equal to 42. The tubes are of 14 mm inside diameter, 16 mm outside diameter and 4 m length. The overall heat transfer coefficient is 3510 kJ/hr-m2 -°C. Cooling water enters the condenser at 25°C at a velocity of 1.5 m/s and leaves with a temperature rise of 6.5°C. (a) Calculate the outside heating surface area of the tubes in m2 ; (b) Determine the mass flow rate of water in kg/s and the volumetric flow rate in L/s (using an average density of 996.5 kg/m3 ); (c) Estimate the condensing temperature of the refrigerant; (d) If the ammonia refrigerant enters and leaves the condenser at saturation conditions, compute the mass flow rate of the refrigerant and the condenser pressure in kPa.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
A double pass water-cooled shell-and-tube type condenser has a total number of tubes equal to 42. The tubes are of 14 mm inside diameter, 16 mm outside diameter and 4 m length. The overall heat transfer coefficient is 3510 kJ/hr-m2 -°C. Cooling water enters the condenser at 25°C at a velocity of 1.5 m/s and leaves with a temperature rise of 6.5°C. (a) Calculate the outside heating surface area of the tubes in m2 ; (b) Determine the mass flow rate of water in kg/s and the volumetric flow rate in L/s (using an average density of 996.5 kg/m3 ); (c) Estimate the condensing temperature of the refrigerant; (d) If the ammonia refrigerant enters and leaves the condenser at saturation conditions, compute the mass flow rate of the refrigerant and the condenser pressure in kPa.
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