Exhaust Gas Heat Exchanger Insert Layout for Uniform Cooling
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Solution Overview
Problem
Conventional heat exchangers for cooling exhaust gas from internal combustion engines suffer from inefficiency due to premature evaporation of coolant, which limits cooling effectiveness as the coolant becomes overheated upon initial contact with the pipe bodies, resulting in inadequate cooling of tube sections further away from the coolant inlet.
Innovation Solution
A housing insert is introduced within the heat exchanger, dividing the coolant flow region into inner and outer paths, with fluidic communication through strategically placed openings, ensuring that coolant initially flows through the outer path before transitioning to the inner path for heat exchange, thereby preventing immediate thermal contact with exhaust gas and reducing evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If coolant is introduced directly into the inner coolant path for immediate heat exchange, then heat transfer efficiency is improved, but coolant evaporation increases and cooling uniformity deteriorates
Solution Approach 1:
The coolant is made to flow through the outer coolant path first before entering the inner coolant path. This preliminary flow through the outer path allows the coolant to be pre-cooled and prevents premature evaporation, ensuring that the coolant maintains its cooling capacity when it reaches the inner path for heat exchange with the exhaust gas.
Solution Approach 2:
The coolant path is divided into two separate sections: an outer coolant path and an inner coolant path. This segmentation allows the coolant to follow a controlled flow sequence, first through the outer path and then through the inner path, preventing direct immediate contact with the hottest exhaust gas and reducing evaporation.
2Use of energy by moving object
If coolant flows directly through the inner coolant path, then heat absorption is maximized, but coolant evaporation increases and cooling duration is reduced
Solution Approach 1:
The coolant undergoes preliminary cooling by flowing through the outer coolant path before entering the inner coolant path. This preliminary action extends the effective cooling duration by preventing premature evaporation and ensuring the coolant maintains its liquid state and heat absorption capacity throughout the entire heat exchange process.
3Device complexity
If a single coolant path is used, then device complexity is reduced, but cooling uniformity deteriorates and coolant evaporation increases
Solution Approach 1:
The coolant path is segmented into an outer coolant path and an inner coolant path connected by openings. This segmentation creates a controlled flow sequence that improves cooling uniformity along the tubular bodies while preventing coolant evaporation, achieving better performance with only moderate increase in structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for homogeneous cooling of exhaust gas along the tubular bodies, significantly reducing coolant evaporation and enhancing the overall efficiency of the heat exchanger by ensuring uniform heat transfer without premature coolant evaporation.
Implementation Method 1
A housing insert (7a, 7b) is arranged in the housing interior (3), which is supported at least on the circumferential wall (4). The housing insert (7a, 7b) divides an area of the housing interior (3) between tube bodies and the circumferential wall (4) into an inner and an outer coolant path (10i, 10a), in each of which the coolant (K) can flow
Implementation Method 2
A coolant channel or coolant path is formed between the individual pipe bodies, through which the coolant to be cooled is passed, fluidically separated, to the exhaust gas, so that heat can be transferred from the exhaust gas to the coolant through the walls of the pipe bodies
Implementation Method 3
The two coolant paths communicate fluidically with each other by means of at least one opening provided in the housing insert
Implementation Method 4
heat exchangers, through which the exhaust gas to be cooled is fluidically separated and led to a liquid coolant, which can absorb heat from the exhaust gas through thermal interaction, so that the exhaust gas is cooled
Data Source
Figure 1~2
Figure 3
AI summary
The invention concerns a heat exchanger (1), in particular an exhaust gas cooling device, for cooling exhaust gas from an internal combustion engine. The heat exchanger (1) comprises a housing (2) which comprises a circumferential wall (4) and two end housing walls (5a, 5b) which together define a housing interior space (3), the circumferential wall (4) having a coolant inlet (11) for introducing a coolant (K) into the housing interior space (3). The heat exchanger (1) comprises a plurality of tubular bodies extending along a longitudinal direction (L) and arranged in the housing interior for the passage of exhaust gas. The heat exchanger (1) further comprises at least one housing insert (7a, 7b) arranged in the housing interior between the tubular bodies and the peripheral wall (4). An opening (12) through which the coolant (K) can flow is formed in the housing insert (7a, 7b), preferably at a distance from the coolant inlet (11).