Dual Cooling Circuit for Large Diesel Engine Heat Dissipation
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Solution Overview
Problem
Large diesel engines face challenges in efficiently dissipating heat in the region of the cylinder liner and fire deck due to increased demands from improved supercharging technology, requiring enhanced cooling systems.
Innovation Solution
The implementation of a dual cooling circuit system where the first cooling jacket is flow-connected to a first cooling chamber surrounding the cylinder liner and the second cooling jacket is flow-connected to a second cooling chamber in the single-cylinder head, with specific cooling channels and configurations to optimize heat dissipation, including annular channels, radial and axial connecting channels, and a mixing valve for temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more heat is dissipated in the region of the cylinder liner and fire deck to meet improved supercharging technology requirements, then engine efficiency and emission control are improved, but the cooling system complexity increases
Solution Approach 1:
The cooling system is divided into multiple independent cooling circuits (first cooling circuit for cylinder head, second cooling circuit for engine block, and optionally third cooling circuit for valve seat rings), each with dedicated cooling chambers and jackets. This segmentation allows targeted heat dissipation in specific regions without requiring a complete system redesign, thereby improving engine efficiency while managing complexity through modular architecture.
Solution Approach 2:
Different regions of the engine are provided with customized cooling solutions: the first cooling circuit with first and second cooling jackets for the cylinder head, the second cooling circuit for the engine block, and optional third cooling circuit specifically for valve seat rings. Each region receives cooling tailored to its specific thermal requirements, enabling effective heat dissipation where needed without uniformly increasing system complexity throughout the entire cooling system.
2Temperature
If a dual cooling circuit system is implemented with separate first and second cooling jackets, then heat dissipation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The first cooling jacket is arranged to surround the cylinder liner, and the second cooling jacket is arranged to surround the first cooling jacket. This nested configuration allows both cooling circuits to occupy overlapping spatial regions without requiring separate external housings, thereby improving heat dissipation effectiveness while minimizing the increase in overall device complexity through efficient space utilization.
3Manufacturing precision
If separate cooling circuits are used for different engine regions, then cooling precision is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple cooling circuits (first cooling circuit for cylinder head, second cooling circuit for engine block, and optionally third cooling circuit for valve seat rings) are merged into a unified cooling system architecture that shares common coolant supply and return lines. This merging approach enables precise temperature control in different engine regions while simplifying manufacturing compared to completely separate cooling systems, as it reduces the number of independent components and assembly steps required.
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 configuration allows for effective and separate cooling of critical regions such as the top land ring, fire deck, and valve seat rings, maintaining optimal coolant temperatures and improving engine efficiency and emission control.
Implementation Method 1
at least one first and one second cooling circuit, in particular for cooling the cylinder head and the engine block separately from each other
Implementation Method 2
the first cooling jacket is surrounded by a first and second cooling jacket, wherein the first cooling jacket is separated with respect to flow from the second cooling jacket within the cylinder housing
Data Source
AI summary
The invention relates to an internal combustion engine, in particular a large diesel engine, having at least a first and a second cooling circuit (31, 32), having at least one individual cylinder (1) with a cylinder housing (2) which accommodates a cylinder liner (3), and having at least one individual cylinder head (4), wherein the cylinder liner (3) is surrounded by at least one cooling jacket (5, 6) which is flow-connected to at least one cooling chamber (14) in the individual cylinder head (4), the cylinder liner (3) is surrounded by a first and a second cooling jacket (5, 6), wherein the first cooling jacket (5) is separated in flow terms from the second cooling jacket (6) within the cylinder housing (2). In order to make high degrees of efficiency and low exhaust-gas values possible, it is proposed that the first cooling jacket (5) is flow-connected to at least a first cooling chamber (14) and the second cooling jacket (6) is flow-connected to at least a second cooling chamber (24) in the individual cylinder head (4).