Heat exchanger unit and method for fluid to passively bypassing a heat exchanger
The invention relates to a heat exchanger unit for an exhaust gas system. The heat exchanger unit comprises an inlet for a fluid flow to enter the heat exchanger unit and an outlet for a fluid flow to exit the heat exchanger unit. The heat exchanger unit comprises a heat exchanger having a heat exchanger conduit passing through the heat exchanger and at least one bypass conduit bypassing the heat exchanger, wherein the at least one bypass conduit comprises a bypass core having a plurality of channels arranged longitudinally along the bypass conduit.
1 . Heat exchanger unit for an exhaust gas system, the heat exchanger unit comprising:
an inlet for a fluid flow to enter the heat exchanger unit;
an outlet for a fluid flow to exit the heat exchanger unit;
the heat exchanger unit comprising a heat exchanger having a heat exchanger conduit passing through the heat exchanger and at least one passive bypass conduit bypassing the heat exchanger;
wherein the at least one passive bypass conduit comprises a bypass core having a plurality of channels arranged longitudinally along the passive bypass conduit, and wherein the bypass core comprises between 100 channels and 800 channels.
2 . Heat exchanger unit according to claim 1 , wherein the plurality of channels is arranged parallel to each other in the bypass core.
3 . Heat exchanger unit according to claim 2 , comprising an array of passive bypass conduits, each of the passive bypass conduits of the array of passive bypass conduits comprising a bypass core having a plurality of channels.
4 . Heat exchanger unit according to claim 3 , wherein at least some of the passive bypass conduits are arranged along a height of the heat exchanger.
5 . Heat exchanger unit according to claim 2 , wherein the plurality of channels in the bypass core is formed by corrugated sheet material.
6 . Heat exchanger unit according to claim 5 , wherein the plurality of channels is formed by rolled-up corrugated sheet material or corrugated plates arranged next to each other.
7 . Heat exchanger unit according to claim 1 , wherein the bypass core comprises between 200 channels and 600 channels.
8 . Heat exchanger unit according to claim 1 , comprising an array of passive bypass conduits, each of the passive bypass conduits of the array of passive bypass conduits comprising a bypass core having a plurality of channels.
9 . Heat exchanger unit according to claim 8 , wherein at least some of the passive bypass conduits are arranged along a height of the heat exchanger.
10 . Heat exchanger unit according to claim 8 , wherein the array of passive bypass conduits comprises between two and 14 passive bypass conduits.
11 . Heat exchanger unit according to claim 8 , comprising more than one heat exchanger core and at least a passive bypass conduit arranged in between neighbouring heat exchanger cores.
12 . Heat exchanger unit according to claim 8 , wherein the array of passive bypass conduits comprises between three and ten passive bypass conduits.
13 . Heat exchanger unit according to claim 8 , wherein the array of passive bypass conduits comprises three, four, or six passive bypass conduits.
14 . Heat exchanger unit according to claim 8 , comprising two, three, or four heat exchanger cores and at least a passive bypass conduit arranged in between neighbouring heat exchanger cores.
15 . Heat exchanger unit according to claim 1 , wherein the plurality of channels in the bypass core is formed by corrugated sheet material.
16 . Heat exchanger unit according to claim 15 , wherein the plurality of channels is formed by rolled-up corrugated sheet material or corrugated plates arranged next to each other.
17 . Heat exchanger unit according to claim 1 , wherein the bypass core comprises or is made of steel.
18 . Heat exchanger unit according to claim 1 , wherein the bypass core comprises a housing having a circular or rectangular cross-section.
19 . Heat exchanger unit according to claim 1 , comprising more than one heat exchanger core and at least a passive bypass conduit arranged in between neighbouring heat exchanger cores.
20 . Heat exchanger unit according to claim 1 , wherein the bypass core comprises between 250 and 450 channels.
21 . Heat exchanger unit according to claim 1 , wherein the bypass core comprises or is made of stainless steel.
22 . Heat exchanger unit according to claim 1 , comprising two, three, or four heat exchanger cores and at least a passive bypass conduit arranged in between neighbouring heat exchanger cores.