Heat exchanger and system for cooling a fluid comprising such a heat exchanger

A system for cooling a fluid exhibiting a first temperature, referred to as hot fluid, with a fluid exhibiting a second temperature, referred to as cold fluid, comprising a hot fluid circuit suitable for being able to be supplied with hot fluid by a hot fluid source, and a cold fluid circuit suitable for being able to be supplied with cold fluid by a cold fluid source, wherein said system further comprises a heat exchanger comprising:

• a fluid circulation chamber comprising a fluid inlet and a fluid outlet intended to be supplied with a first fluid, referred to as outer fluid, brought to a first temperature,
• a heat exchange matrix housed in said circulation chamber and formed by a plurality of heat exchange tubes each comprising at least one pair of ducts nested one inside the other, referred to as inner duct and outer duct, respectively, extending along a direction, referred to as longitudinal direction, and defining:
• a channel for the circulation of a fluid, referred to as inner channel, delimited by said inner duct, and suitable for being able to be supplied with a second fluid, referred to as inner fluid, brought to a second temperature, and
• a channel for the circulation of a fluid, referred to as intermediate channel, delimited by the inter-duct space between said inner duct and said outer duct and suitable for being able to be supplied with a third fluid, referred to as intermediate fluid, brought to a third temperature, different from said first temperature,
• wherein at least one heat exchange tube comprises at least two pairs of nested ducts said pairs being connected to each other by at least one transverse spacer, said hot circuit supplying said intermediate channels and said cold circuit supplying said inner channels and said circulation chamber of said exchanger.

An air conditioning system of a cabin of a transport vehicle comprising at least one air cooling system for cooling a fluid exhibiting a first temperature, referred to as hot fluid, with a fluid exhibiting a second temperature, referred to as cold fluid, comprising a hot fluid circuit suitable for being able to be supplied with hot fluid by a hot fluid source, and a cold fluid circuit suitable for being able to be supplied with cold fluid by a cold fluid source, the system further including a heat exchanger comprising:

• a fluid circulation chamber comprising a fluid inlet and a fluid outlet intended to be supplied with a first fluid, referred to as outer fluid, brought to a first temperature,
• a heat exchange matrix housed in said circulation chamber and formed by a plurality of heat exchange tubes each comprising at least one pair of ducts nested one inside the other, referred to as inner duct and outer duct, respectively, extending along a direction, referred to as longitudinal direction, and defining:
• a channel for the circulation of a fluid, referred to as inner channel, delimited by said inner duct, and suitable for being able to be supplied with a second fluid, referred to as inner fluid, brought to a second temperature, and
• a channel for the circulation of a fluid, referred to as intermediate channel, delimited by the inter-duct space between said inner duct and said outer duct and suitable for being able to be supplied with a third fluid, referred to as intermediate fluid, brought to a third temperature, different from said first temperature,
• wherein at least one heat exchange tube comprises at least two pairs of nested ducts said pairs being connected to each other by at least one transverse spacer
• said hot circuit supplying said intermediate channels and said cold circuit supplying said inner channels and said circulation chamber of said exchanger.