Combined heat exchanger, particularly for a motor vehicle
AssigneeValeo Thermique Moteur
InventorChristian Marsais
Life of this patent
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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 mm2≦DHa×DHb≦3.00 mm2 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 mm2) and P the internal perimeter, or “wet perimeter”, of the tube (expressed in mm).
Claims20
A combined heat exchanger including:
- two manifolds;
- and
- a bank of tubes linking the manifolds, the combined heat exchanger divided into an oil cooler part, the tubes of which are suitable for being traversed by oil, and into a condenser part, the tubes of which are suitable for being traversed by a cooling fluid, wherein the tubes of the oil-cooler part and the tubes of the condenser part have different hydraulic diameters related by the following inequality:
- 0.8 mm2≦DHa×DHb≦3.00 mm2
- where the hydraulic diameter DH of a tube is defined by the formula DH=4S/P, in which S designates the area of the cross-section of the tube (expressed in mm2) and P the internal perimeter of the tube (expressed in mm).
A combined heat exchanger comprising:
- two manifolds, each of the manifolds having a first part and a second part;
- and
- a bank of tubes respectively linking the first parts of the manifolds and the second parts of the manifolds, wherein a first group of tubes for a first fluid link the first parts and a second group of tubes for a second fluid link the second parts, wherein the tubes of the first group and the tubes of the second group have different hydraulic diameters related by the inequality:
- 0.8 mm2≦DHfirst×DHsecond≦3.00 mm2
- wherein DH is the hydraulic diameter of a tube as defined by DH=4S/P, in which S is the cross-sectional area of the tube (in mm2) and P is the internal perimeter of the tube (in mm).
Dependencies are inferred from the claim text.