COOLING SYSTEM
7.12
HEAT EXCHANGER SELECTION
Heat exchanger cores are available in a wide variety of con
fi
gurations. Heat exchanger materials,
construction and design can be any of the materials and designs listed in Table 7-2.
Materials, Construction, and Design
Choices
Heat Exchanger Materials
Copper, Brass, Aluminum, Steel
Heat Exchanger Construction
Lead Soldered, No Lead Soldered, Brazed,
Welded, Mechanical Bond
Fin Geometry
Plate, Serpentine, Square, Louvered, Non Louvered
Tube Geometry
Oval, Round, Internally Finned, Turbulated
Coolant Flow
Down Flow, Cross Flow, Multiple Pass Series Flow,
Multiple Pass Counter Flow
Table 7-2
Heat Exchanger Materials, Construction, and Design Choices
All of these variations can have an effect on heat exchanger size, performance and resistance to
fl
ow on both the
fi
n side and tube side for both radiators and charge air coolers.
Meet the following design criteria to achieve greatest ef
fi
ciency for fan cooled applications:
□
Utilize the largest practical frontal area in order to minimize restriction to air
fl
ow.
□
Use square cores. The square core allows maximum fan sweep area, thus providing most
effective fan performance.
□
Keep core thickness and
fi
n density (
fi
ns per unit length) to a minimum. This keeps air
fl
ow
restriction low, helps prevent plugging, and promotes easier core cleaning.
□
Fin density in excess of 10
fi
ns per inch should be reviewed with Detroit Diesel Application
Engineering.
□
Use the largest possible fan diameter to permit operating at slower fan speeds, resulting
in lower noise and horsepower demand.
Meet the following criteria to achieve greatest ef
fi
ciency for liquid to liquid cooled applications:
□
Tube velocity
□
Water pump restriction
□
Size and shape determined by installation
7-26
All information subject to change without notice.
(Rev. 03/06)
7SA250 0603
Copyright © 2006 DETROIT DIESEL CORPORATION
