# Design of a Finned Radiator Assembly

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Design of a Finned Radiator Assembly
MAE 441
Design of a Finned Radiator Assembly
Heat Exchanger Design Project
Thien Van Tran
Chris Longfield
Eric Pacewicz
Olivia Ching

4/3/2012

Scope of the Project

The objective of the project was to design an effective radiator assembly to accommodate the Diesel-Engine Generator Set 1500-XC6DT2 by incorporating the use of tubes with inner fins in various geometries in order to meet the heat rejection requirements specified. This was done with consideration for minimizing cost, size, and complexity.

Initial Parameters

The initial parameters were the operating requirements of the Diesel-Engine Generator Set 1500-XC6DT2 are as follows:
Coolant capacity – The coolant chosen for our radiator is ethylene glycol (50/50 % by volume)
Its maximum operating temperature of 225F
Air flow rate – Since the generator is stationary as opposed to that used in an automobile application, a fan will be needed to provide the necessary flow rate. The required air flow rate specified by the engine is 9.383 /s in order to dissipate the heat generated
Coolant flow rate – The coolant flow rate is 17.914 kg/s through the radiator
The initial coolant temperature is assumed to be 212F, which is slightly below the operating temperature of the engine. The initial coolant temperature is taken as the ethylene glycol entering the radiator immediately after leaving the engine.
Pressure drop allowance – The
The total heat rejected to the coolant is 666kW
The outlet temperature of the coolant leaving the radiator was calculated to be 192F

Assumptions

In order to design a radiator for a specific operating condition, we assume the ambient temperature is 90F, which was the highest average temperature in Miami, Florida last year. This is accounting for the worst case scenario. We also assume that the ambient air density is constant throughout operation. We also assumed that there was no significant fouling on the inside of the tubes, so the heat transfer

References: 1. "Brass Tube Brass", OnlineMetals.com, 2012, http://www.onlinemetals.com/merchant.cfm?pid=1548&step=4&showunits=inches&id=84&top_cat=79  2. "Brass Sheet", "Copper Sheet", Discount Steel, 2012, http://www.discountsteel.com/  3. Liu, Hongtan. Heat Exchangers: Selection, Rating, and Thermal Design. 2nd ed. Boca Raton: CRC, 2000. Print. 4. Enhanced Single-Phase Turbulent Tube-side Flows and Heat Transfer. Engineering Data Book III. Wolverine Tube Inc. Web. 4 Apr. 2012. Appendix Figure A1. A close-up view of the finned tube array Figure A2. A top view of a single fin plate, with holes for the tubes Figure 3A. A cross-sectional view of the inner-ribbed tubes

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