Supervisor by :Prof. Dr. Malek Al-Ahmad Name : Ali Hassan Al-Godrani

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Supervisor by :Prof. Dr. Malek Al-Ahmad Name : Ali Hassan Al-Godrani King Saud University College of Engineering Chemical Engineering Department Finned Tube exchanger Supervisor by :Prof. Dr. Malek Al-Ahmad Name : Ali Hassan Al-Godrani

Contact 1. …………….. Introduction 2…………….. theory 3………….. Calculation 4………… finned tubing 5………… Conclusion 6………………Reference

Introduction (This case study demonstrates the transient thermal fluid simulation of a finned tube heat exchanger. The finned tube heat exchanger model can also be used in cycle analysis where it is used in conjunction with other models (See "Start-up of two-shaft High-Temperature Gas-Cooled Nuclear Power plant" case study).

Theory In a heat exchanger, the two fluids namely: hot and cold, are separated by a metal wall. Under this condition the rate of heat transfer will depend on the overall resistance to heat transfer given by the equation: where Ui = Overall heat transfer coefficient based on inner area [Kcal/hrm2 ْC] U0 = Overall heat transfer coefficient based on outer area [Kcal/hrm2 ْC] Hi,h0 = Inside and outside film heat transfer coefficients [Kcal/hrm2 ْC] Ai, A0 = Inside and outside surface are [m2]

Conclusion The thermal fluid transient simulation of a finned tube heat exchanger was discussed. The thermal inertia of the finned tube heat exchanger was visible in the temperature results. Depending on the design criteria, different variables can be monitored during the transient event, e.g. velocities, pressure difference between the fin and tube sides. From the temperature graph it can also be determined whether the heat exchanger would provide the design point outlet temperature for the specified transient even.

Reference 1…………www.flownex.com 2………..M.M. Abbott (chemical engineering thermodynamic) . 1996. 3………..Papoulias, S.A., and I.E. Grossmann; ' A Structural Optimization Approach to Process Synthesis-II. Heat recovery Networks, " Comp. and Chem. Eng., 7, 707 (1983). 4…………. www.flownex.com