Heat-exchanging device and motor vehicle

Abstract

An exhaust gas installation is provided that comprises an exhaust gas evaporator mounted downstream of an internal combustion engine of a motor vehicle. The exhaust gas evaporator has a sandwich-type structure wherein exhaust gas planes and coolant planes are alternately directly adjacently arranged, providing a very compact while very efficient exhaust gas evaporator.

1 . A device for exchanging heat between a first medium and a second medium, the device comprising:
 a plurality of plate pairs stacked one on top of another in a stacking direction;   a first flow space through which a first medium is adapted to flow is arranged between two plates of at least one plate pair; and   a second flow space through which a second medium is adapted flow is arranged between two plate pairs adjacent to one another,   wherein the first flow space has a first flow path for the first medium with flow path sections, in which the first medium is adapted to flow through the flow path sections one after another in opposite directions, and which are separated from one another by a partition wall arranged between the at least two plates of the at least one plate pair.   
     
     
         2 . The device according to  claim 1 , wherein two flow path sections, which are adapted to be flown through directly one after another, are connected to one another via a deflection section. 
     
     
         3 . The device according to  claim 2 , wherein the deflection section is formed by a recess or a break in the partition wall. 
     
     
         4 . The device according to  claim 2 , wherein the deflection section is formed by a gap remaining between the partition wall and a lateral boundary of the first flow space or the plate pair. 
     
     
         5 . The device according to  claim 1 , wherein two or more than two partition walls are formed together as a single piece. 
     
     
         6 . The device according to  claim 5 , wherein the two or more partition walls are formed by an auxiliary plate arranged between the at least two plates of the at least one plate pair and formed as a corrugated sheet. 
     
     
         7 . The device according to  claim 1 , wherein at least one flow path section has one, two, or more than two flow channels which are configured to be flown through parallel to one another. 
     
     
         8 . The device according to  claim 2 , wherein at least two of the flow channels of the at least one flow path section are connectable to one another via the deflection section. 
     
     
         9 . The device according to  claim 1 , wherein the flow channels are closed at their front ends by a boundary of the first flow space or by one or both plates of the plate pair. 
     
     
         10 . The device according to  claim 1 , wherein a first deflection section is arranged to a second flow channel at a first partition wall of a first flow channel at a first front end of the first flow channel, and wherein a second deflection section is arranged to a third flow channel, which is different from the second flow channel, at a second partition wall of the first flow channel at a second front end lying opposite to the first front end of the first flow channel. 
     
     
         11 . The device according to  claim 1 , wherein the flow channels together with the deflection channels form a single serpentine-like meandering flow path through the first flow space. 
     
     
         12 . The device according to  claim 1 , wherein the first and the second flow space are configured to flown through in different main flow directions. 
     
     
         13 . The device according to  claim 1 , wherein the second flow space has a larger flow cross section than a flow path section of the flow path in the first flow space, particularly a larger flow cross section than the first flow space. 
     
     
         14 . A motor vehicle comprising a combustion engine, an exhaust gas line, and a device, arranged in the exhaust gas line, for exchanging heat between a coolant of a cooling circuit of the combustion engine and the exhaust gas or between a cooling agent of a cooling circuit of an air conditioning system and the exhaust gas, wherein the coolant or the cooling agent is evaporated in the device, and wherein the device comprises:
 a plurality of plate pairs stacked one on top of another in a stacking direction;   a first flow space through which a first medium is adapted to flow is arranged between two plates of at least one plate pair; and   a second flow space through which a second medium is adapted flow is arranged between two plate pairs adjacent to one another,   wherein the first flow space has a first flow path for the first medium with flow path sections, in which the first medium is adapted to flow through the flow path sections one after another in opposite directions, and which are separated from one another by a partition wall arranged between the at least two plates of the at least one plate pair   
     
     
         15 . The motor vehicle according to  claim 14 , wherein the first flow channels are arranged substantially vertical to a base of the motor vehicle, the base being a road surface. 
     
     
         16 . The motor vehicle according to  claim 15 , wherein the base of the motor vehicle is a road surface. 
     
     
         17 . The motor vehicle according to  claim 14 , wherein the first flow channels are arranged substantially perpendicular to a base of the motor vehicle.