A cooling system is mounted on an internal combustion engine equipped with an EGR device including an EGR passage. The cooling system includes: an intercooler disposed in the intake passage; an EGR cooler disposed in the EGR passage; a condensed water discharger configured to discharge condensed water generated in the EGR cooler from the EGR passage; a radiator configured to cool a first coolant to or below a dew point of the EGR gas flowing into the EGR cooler; a first circulation flow path configured to circulate the first coolant in the order of the radiator, the EGR cooler, and the intercooler; and a pump disposed in the first circulation flow path and configured to circulate the first coolant such that an outlet gas temperature of the EGR cooler is equal to or lower than the dew point of the EGR gas flowing into the EGR cooler.

A cooling system is mounted on an internal combustion engine equipped with an EGR device including an EGR passage. The cooling system includes: an intercooler disposed in the intake passage; an EGR cooler disposed in the EGR passage; a condensed water discharger configured to discharge condensed water generated in the EGR cooler from the EGR passage; a radiator configured to cool a first coolant to or below a dew point of the EGR gas flowing into the EGR cooler; a first circulation flow path configured to circulate the first coolant in the order of the radiator, the EGR cooler, and the intercooler; and a pump disposed in the first circulation flow path and configured to circulate the first coolant such that an outlet gas temperature of the EGR cooler is equal to or lower than the dew point of the EGR gas flowing into the EGR cooler.

One embodiment is a heat exchanger comprising a shell surrounding a first fluid plenum, a plurality of flow chamber walls positioned inside the shell, and a diffuser positioned inside the shell. The plurality of flow chamber walls: at least partially define a plurality of first fluid radial flow channels in flow communication with a first fluid inlet and the first fluid plenum, at least partially define a plurality of second fluid axial flow channels in flow communication with a second fluid inlet, and comprise an arcuate shape and arranged in an array to at least partially define arcuate shapes of the first fluid radial flow channels and the second fluid axial flow channels. The diffuser includes a diffuser surface at least partially defining a diffusion flow path from the first fluid inlet and the plurality of first fluid radial flow channels.

A core body includes a structure having a plurality of connected unit cells. At least one unit cell has one or more sidewalls that are curved and define a portion of an inner passageway within and through the unit cell. The one or more sidewalls define multiple orifices and include a cone disposed between at least some of the orifices. A dimple is defined along an outer surface of the unit cell at the cone. The outer surface at least partially defines an outer passageway that is sealed from the inner passageway by the one or more sidewalls. The one or more sidewalls are configured to transport one or more of thermal energy from a first fluid or a component of the first fluid flowing in the inner passageway to a second fluid flowing in the outer passageway without the first fluid mixing with the second fluid.

An EGR cooler includes a tube assembly formed by stacking a plurality of tubes in which exhaust gas flows and a cover plate having a mounting portion formed concavely to mount the tube assembly thereon. A baffle is mounted at the tube assembly and adjusts flow of coolant inflow from a cylinder block. An inlet cover is installed on a first side of an outer surface of the cover plate to supply the exhaust gas to each tube and an outlet cover is installed on a second side of outer surface of the cover plate to exhaust the exhaust gas from each tube. At least one coolant passage in which the coolant flows is formed between the plurality of tubes.

An EGR cooler includes a tube assembly formed by stacking a plurality of tubes in which exhaust gas flows and a cover plate having a mounting portion formed concavely to mount the tube assembly thereon. A baffle is mounted at the tube assembly and adjusts flow of coolant inflow from a cylinder block. An inlet cover is installed on a first side of an outer surface of the cover plate to supply the exhaust gas to each tube and an outlet cover is installed on a second side of outer surface of the cover plate to exhaust the exhaust gas from each tube. At least one coolant passage in which the coolant flows is formed between the plurality of tubes.

A heat exchanger includes a plurality of heat transfer tubes (3) and a centrally arranged bypass tube (4), which are held each between a tube plate (5) of a gas inlet chamber (7) and a tube plate (6) of a gas outlet chamber (8) that are connected to a cylindrical jacket. A coolant (11) is introduced into the jacket space (9) enclosing the tubes (3, 4). A control device (16), includes a throttle valve (18) and a drive (19), sets a gas outlet temperature range of the heat exchanger (1). A discharge rate and a discharged quantity of an uncooled process gas stream (14) from the bypass tube is controlled by the throttle valve, at an outlet end (17) of the bypass tube and is adjustable via the control device. The throttle valve is formed of a material resistant to high-temperature corrosion in a temperature range sensitive for high-temperature corrosion.

A heat exchanger includes a plurality of heat transfer tubes (3) and a centrally arranged bypass tube (4), which are held each between a tube plate (5) of a gas inlet chamber (7) and a tube plate (6) of a gas outlet chamber (8) that are connected to a cylindrical jacket. A coolant (11) is introduced into the jacket space (9) enclosing the tubes (3, 4). A control device (16), includes a throttle valve (18) and a drive (19), sets a gas outlet temperature range of the heat exchanger (1). A discharge rate and a discharged quantity of an uncooled process gas stream (14) from the bypass tube is controlled by the throttle valve, at an outlet end (17) of the bypass tube and is adjustable via the control device. The throttle valve is formed of a material resistant to high-temperature corrosion in a temperature range sensitive for high-temperature corrosion.

An exhaust gas recirculation (EGR) cooler assembly can be used to perform heat exchange between cooling water and exhaust gas. The EGR cooler assembly includes an EGR cooler in which cooling water flows, and a diesel particulate filter (DPF) including a housing accommodating therein the EGR cooler and a filter unit for post-treatment of the exhaust gas. An inside of the housing is sectioned by a partition into a first space in which the EGR cooler is inserted and a second space in contact with the filter unit, and the partition has a flow hole formed thereon in order to allow the exhaust gas to flow to the EGR cooler.

An engine EGR system is provided, which includes an engine body, an intake passage, an exhaust passage and an EGR passage configured to recirculate exhaust gas as EGR gas to the intake passage. The EGR passage includes an EGR cooler and an EGR internal passage constituting the EGR passage upstream of the EGR cooler, and including a passage passing through a cylinder head. The EGR internal passage has a bent pipe part including a first bent portion at which an upstream portion of the EGR internal passage is bent away from a gas inflow port of the EGR cooler, a second bent portion located downstream of the first bent portion and bending the EGR internal passage toward the gas inflow port, and an intermediate portion connecting the first and the second bent portions by being disposed therebetween. The water-cooling passage is disposed around the bent pipe part.