A 1-2 shell-and-tube heat exchanger is used to cool condensed steam at a rate of \( 105 \mathrm{~kg} / \mathrm{h} \) from \( X=C \) to \( Y=C \) using cooling water available at \( Z=C \). The operating conditions do not permit exit temperatures of cooling water exceeding \( 40^{\circ} \mathrm{C} \). Select a counter flow heat exchanger with \( \% \) inch OD tube, 16 BWG, triangular pitch and 8 feet long tube arrangement with a tube thickness of 0.083 inch. By referring to the data sheet and with suitable assumptions, Evaluate the following: (i) Mass flow rate of water: 1 mark (ii) Corrected LMTD 1 mark (iii)Total number of tubes; 1 mark (iv)Tube side Reynolds number: 1 mark (v) Inside heat transfer coefficient; 2 marks (vi) Shell side Reynolds number 1 mark (vii)Shell side heat transfer coefficient; 2 marks (viii)Overall heat transfer coefficient; 2 marks (ix)Inside heat transfer area 1 mark (x)Actual heat transfer area 1 mark (xi)Actuat design overatt heat transfer 2 marks coefficient
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Design of Shell and Tube Heat Exchanger Crude oil at 198°C is to be cooled to 39°C. The oil flow rate is 6.103 kg/s. Cooling water is available at 29°C and at a rate of 27.103 kg/s. The pressure drop allowance for each stream is 100 kN/m^2. Design a suitable shell and tube heat exchanger for this duty. The following are the properties of the two streams at the average temperature: Water: - Density: 990 kg/m^3 - Viscosity: 0.68 × 10^-3 Nm^-2 s - Thermal Conductivity: 0.63 W/m K - Specific Heat: 4.2 kJ/kg °K Crude Oil: - Density: 850 kg/m^3 - Viscosity: 0.18 × 10^-3 Nm^-2 s - Thermal Conductivity: 0.13 W/m K - Specific Heat: 2.3 kJ/kg °K Data: Assume an overall heat transfer coefficient of 502 W/m^2 K. Tubes: - Outer diameter: 20 mm - Inner diameter: 16 mm - Length: 4 m - Square pitch: 1.25 times the outer diameter - Material: carbon steel - Pull through head, Floating Head type heat exchanger - Baffle: 1/5 of the shell diameter and 25% cut baffles - Fouling factors: 0.0003 m^2 K/W for cooling water and 0.0002 m^2 K/W for crude oil - Thermal conductivity of metal: 53 W/m K i. Present your design with emphasis on identifying the design problem and constraints. ii. Discuss the health, safety, and environmental issues related to the design. iii. Prepare the standards compliance certificate for the design. iv. Estimate the cost of the heat exchanger using the CEPCI.
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