Abstract: A cooler passivation process for a coolant cooler of a cooler device mounted in a motor vehicle A cooler device with a coolant cooler is provided, the latter having at least one aluminum cooling channel with a cooler surface provided with flux. The cooler device is provided in a motor vehicle and is then put into operation with at least one fuel cell of the motor vehicle. In order to form a passivation layer on the coolant cooler, according to the invention a previously provided aqueous passivation solution is formed from passivation layer forming material and fuel cell wastewater is applied to the cooler surface, provided with the flux, of the at least one aluminum cooling channel, the passivation solution reacting with the cooler surface, provided with the flux, of the at least one aluminum cooling channel while thermal energy provided by the coolant cooler is supplied, forming a passivation layer.

Abstract: The invention relates to a method for operating a fuel cell system, comprising a cooling circuit for cooling at least one fuel cell, wherein a coolant circulating in the cooling circuit is cooled with a coolant cooler, which also has air flowing through it. The air is supplied by a fan assembly. The fuel cell system also comprises an evaporative cooling unit, which, upstream of the coolant cooler, introduces water into the air supplied by the fan assembly. An increased efficiency of the fuel cell system alongside sufficient cooling of the at least one fuel cell is achieved in that the evaporative cooling unit introduces water at a maximum rate before the fan assembly reaches its maximum air mass flow. The invention also relates to a fuel cell system of this type, as well as a motor vehicle comprising a fuel cell system of this type.

Abstract: The invention relates to a method for operating a fuel cell system, comprising a cooling circuit for cooling at least one fuel cell, wherein a coolant circulating in the cooling circuit is cooled with a coolant cooler, which also has air flowing through it. The air is supplied by a fan assembly. The fuel cell system also comprises an evaporative cooling unit, which, upstream of the coolant cooler, introduces water into the air supplied by the fan assembly. An increased efficiency of the fuel cell system alongside sufficient cooling of the at least one fuel cell is achieved in that the evaporative cooling unit introduces water at a maximum rate before the fan assembly reaches its maximum air mass flow. The invention also relates to a fuel cell system of this type, as well as a motor vehicle comprising a fuel cell system of this type.

Abstract: A cooler passivation process for a coolant cooler of a cooler device mounted in a motor vehicle A cooler device with a coolant cooler is provided, the latter having at least one aluminum cooling channel with a cooler surface provided with flux. The cooler device is provided in a motor vehicle and is then put into operation with at least one fuel cell of the motor vehicle. In order to form a passivation layer on the coolant cooler, according to the invention a previously provided aqueous passivation solution is formed from passivation layer forming material and fuel cell wastewater is applied to the cooler surface, provided with the flux, of the at least one aluminum cooling channel, the passivation solution reacting with the cooler surface, provided with the flux, of the at least one aluminum cooling channel while thermal energy provided by the coolant cooler is supplied, forming a passivation layer.

Abstract: The invention relates to a method for sprinkling a heat exchanger of a fuel cell vehicle with a fluid. The heat exchanger comprises a sprinkling surface and at least one group with at least one part surface. All part surfaces of all groups together fully represent the sprinkling surface. In the method, all part surfaces of the group are sprinkled with the fluid within a sprinkling period and not sprinkled within a drying period. The invention also relates to a sprinkling system for carrying out the method.

Abstract: A coolant cooler has a cooling block formed by tubes arranged parallel to one another. The tubes form multiple first flow ducts through which a first fluid can flow. In regions between the tubes multiple second flow ducts are formed through which a second fluid can flow. The coolant cooler includes a first collecting box on which a first fluid inlet is arranged and a second collecting box on which a first fluid outlet is arranged. The first flow ducts are in fluid communication with a first cooling circuit via the first fluid inlet, the first fluid outlet, and the collecting boxes. The first or second collecting box has a second fluid inlet and a second fluid outlet such that the second fluid inlet, the respective collecting box, and the second fluid outlet are in fluid communication with a second cooling circuit.

Abstract: A coolant cooler has a cooling block formed by tubes arranged parallel to one another. The tubes form multiple first flow ducts through which a first fluid can flow. In regions between the tubes multiple second flow ducts are formed through which a second fluid can flow. The coolant cooler includes a first collecting box on which a first fluid inlet is arranged and a second collecting box on which a first fluid outlet is arranged. The first flow ducts are in fluid communication with a first cooling circuit via the first fluid inlet, the first fluid outlet, and the collecting boxes. The first or second collecting box has a second fluid inlet and a second fluid outlet such that the second fluid inlet, the respective collecting box, and the second fluid outlet are in fluid communication with a second cooling circuit.

Abstract: A heat exchanger for a motor vehicle is provided having at least one block formed by tubes arranged parallel to one another and by fins arranged between the tubes. The tubes form multiple first flow ducts through which a first fluid can flow. The regions between the tubes form multiple second flow ducts through which a second fluid can flow around the tubes. The heat exchanger also has a first collecting box with a first fluid port and a second collecting box with a second fluid port. The first flow ducts are in fluid communication with a first cooling circuit via the first fluid port, the second fluid port, and the collecting boxes. The first collecting box or the second collecting box also has a third fluid port that, together with its respective collecting box and further fluid port, are in fluid communication with a second cooling circuit.

Abstract: A heat exchanger for a motor vehicle is provided having at least one block formed by tubes arranged parallel to one another and by fins arranged between the tubes. The tubes form multiple first flow ducts through which a first fluid can flow. The regions between the tubes form multiple second flow ducts through which a second fluid can flow around the tubes. The heat exchanger also has a first collecting box with a first fluid port and a second collecting box with a second fluid port. The first flow ducts are in fluid communication with a first cooling circuit via the first fluid port, the second fluid port, and the collecting boxes. The first collecting box or the second collecting box also has a third fluid port that, together with its respective collecting box and further fluid port, are in fluid communication with a second cooling circuit.

Abstract: Disclosed is a coolant cooler having a block formed by tubes arranged parallel to one another and by fins arranged between the tubes, wherein the tubes form multiple first flow ducts through which a first fluid can flow, wherein the regions between the tubes form multiple second flow ducts through which a second fluid can flow around the tubes, a first collecting box on which a first fluid inlet is arranged, a second collecting box on which a first fluid outlet is arranged, wherein the first flow ducts are in fluid communication with a first cooling circuit via the first fluid inlet, the first fluid outlet and collecting boxes, wherein the first or second collecting box has a second fluid inlet and a second fluid outlet, wherein the second fluid inlet, the respective collecting box and the second fluid outlet are in fluid communication with a second cooling circuit.