Combined heat exchanger, particularly for a motor vehicle
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United States of America Patent
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May 28, 2002
Grant Date -
N/A
app pub date -
Nov 19, 1999
filing date -
Nov 20, 1998
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A motor vehicle combined heat exchanger has a tube bank linked to two manifolds and divided into an oil cooler having tubes for oil, and a condenser having tubes for a cooling fluid. The two types of tubes are different and possess respective hydraulic diameters related by the following inequality: 0.8 mm.sup.2.ltoreq.DHa.times.DHb.ltoreq.3.00 mm.sup.2 where the hydraulic diameter (DH) of a tube is defined by the formula DH=4S/P, in which S designates the area of the internal cross-section of the tube (expressed in mm.sup.2) and P the internal perimeter, or 'wet perimeter', of the tube (expressed in mm).
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