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A cooling system on board an aircraft includes a device for removing by suction a boundary layer, and a heat exchanger through which flows the boundary layer air that has been removed by suction. Cooling by way of a ram air channel can be reduced or entirely stopped, depending on the flight phase, s

A cooling system on board an aircraft includes a device for removing by suction a boundary layer, and a heat exchanger through which flows the boundary layer air that has been removed by suction. Cooling by way of a ram air channel can be reduced or entirely stopped, depending on the flight phase, such that the air drag of the aircraft and thus the fuel consumption can be reduced.

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1. A cooling system for an aircraft, the cooling system comprising: a suction unit for removing, by suction through suction air apertures, boundary layer air from a flow-critical surface of the aircraft;a heat exchanger for cooling a medium, through which heat exchanger the boundary layer air that h

1. A cooling system for an aircraft, the cooling system comprising: a suction unit for removing, by suction through suction air apertures, boundary layer air from a flow-critical surface of the aircraft;a heat exchanger for cooling a medium, through which heat exchanger the boundary layer air that has been removed by suction flows; anda ram-air channel comprising a closed-loop control device and a ram-air channel flap regulated by the closed-loop control device,wherein the closed-loop control device comprises a temperature sensor upstream or downstream of the heat exchanger for determining measuring data for the cooling system;wherein the closed-loop control device and the ram-air channel flap are adapted to regulate an airstream of ram air flowing through the ram-air channel in order to add ram air flowing through the ram-air channel to the boundary layer air upstream of the heat exchanger and thus before both the ram-air and the boundary layer air are fed to the heat exchanger to increase the cooling output of the cooling system when the closed-loop control device determines from the measuring data for the cooling system that removing the boundary layer air by suction through the air apertures is not efficient enough and thus the cooling output of the cooling system has to be increased;wherein the boundary layer air that has been removed by suction and the ram air are used as a coolant that flows through the heat exchanger. 2. The cooling system of claim 1, wherein the suction unit comprises at least one of a pump and a compressor for removing by suction the boundary layer air. 3. The cooling system of claim 1, further comprising: a bypass channel for bypassing the heat exchanger. 4. The cooling system of claim 3, wherein the bypass channel comprises a bypass flap that regulates an airstream flowing through the bypass channel such that the cooling output of the cooling system can be regulated. 5. The cooling system of claim 4, further comprising: a fan in the ram-air channel. 6. The cooling system of claim 3, wherein the suction unit is arranged in a line near the bypass channel such that the suction unit can also be used for taking in the ram air. 7. The cooling system of claim 1, wherein the cooling system is configured for cooling an air conditioning unit of the aircraft. 8. The cooling system of claim 1, wherein the suction unit is arranged in a line downstream of the heat exchanger. 9. An aircraft comprising a cooling system, the cooling system comprising: a suction unit for removing, by suction through suction air apertures, boundary layer air from a flow-critical surface of the aircraft;a heat exchanger for cooling a medium, through which heat exchanger the boundary layer air that has been removed by suction flows;a ram-air channel comprising a closed-loop control device and a ram-air channel flap regulated by the closed-loop control device,wherein the closed-loop control device comprises a temperature sensor upstream or downstream of the heat exchanger for determining measuring data for the cooling system;wherein the closed-loop control device and the ram-air channel flap are adapted to regulate an airstream of ram air flowing through the ram-air channel in order to add ram-air flowing through the ram-air channel to the boundary layer air upstream of the heat exchanger and thus before both the ram air and the boundary layer air are fed to the heat exchanger to increase the cooling output of the cooling system when the closed-loop control device determines from the measuring data for the cooling system that removing the boundary layer air by suction through the air apertures is not efficient enough and thus the cooling output of the cooling system has to be increased;wherein the boundary layer air that has been removed by suction and the ram air are used as a coolant that flows through the heat exchanger. 10. A method for cooling a medium in an aircraft, comprising: removing, by suction, boundary layer air from a flow-critical surface of the aircraft;regulating an airstream flowing through a ram-air channel;determining measuring data for the cooling system by a closed-loop control device comprising a temperature sensor upstream or downstream of a heat exchanger;adding the ram-air flowing through the ram-air channel to the boundary layer air upstream of the heat exchanger and thus before both the ram-air and the boundary layer air are fed to the heat exchanger to increase the cooling output of the cooling system when the closed-loop control device determines from the measuring data for the cooling system that removing the boundary layer air by suction through the air apertures is not efficient enough and thus the cooling output of the cooling system has to be increased;making the boundary layer air that has been removed by suction and the airstream flowing through the ram-air channel flow through the heat exchanger for cooling a medium; andwherein the boundary layer air removed by suction and the air stream flowing through the ram-air channel is used as a coolant for the heat exchanger. 11. The method of claim 10, further comprising: bypassing the heat exchanger by way of a bypass channel; andregulating the cooling output of the cooling system by regulating an airstream through the bypass channel. 12. A fuel cell system in an aircraft, comprising a cooling system, the cooling system comprising: a suction unit for removing, by suction through suction air apertures, boundary layer air from a flow-critical surface of the aircraft;a heat exchanger for cooling a medium, through which heat exchanger the boundary layer air that has been removed by suction flows; anda ram-air channel comprising a closed-loop control device and a ram-air channel flap regulated by the closed-loop control device;wherein the closed-loop control device comprises a temperature sensor upstream or downstream of the heat exchanger for determining measuring data for the cooling system;wherein the closed-loop control device and the ram-air channel flap are adapted to regulate an airstream of ram air flowing through the ram-air channel in order to add ram air flowing through the ram-air channel to the boundary layer air upstream of the heat exchanger and thus before both the ram-air and the boundary layer air are fed to the heat exchanger to increase the cooling output of the cooling system when the closed-loop control device determines from the measuring data for the cooling system that removing the boundary layer air by suction through the air apertures is not efficient enough and thus the cooling output of the cooling system has to be increased;wherein the boundary layer air that has been removed by suction and the ram air are used as a coolant that flows through the heat exchanger. 13. The fuel cell system of claim 12, wherein the suction unit comprises at least one of a pump and a compressor for removing by suction the boundary layer air. 14. The fuel cell system of claim 12, the cooling system further comprising: a bypass channel for bypassing the heat exchanger. 15. The fuel cell system of claim 14, wherein the bypass channel comprises a bypass flap that regulates an airstream flowing through the bypass channel such that the cooling output of the cooling system can be regulated. 16. The fuel cell system of claim 15, the cooling system further comprising: a fan in the ram-air channel. 17. The fuel cell system of claim 14, wherein the suction unit is arranged in a line near the bypass channel such that the suction unit can also be used for taking in the ram air. 18. The fuel cell system of claim 12, wherein the suction unit is arranged in a line downstream of the heat exchanger.