Exhaust Heat Recovery Device Flow Stabilization
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Solution Overview
Problem
Existing exhaust heat recovery devices experience a decrease in heat recovery efficiency due to turbulence in the flow of heat medium and inefficient heat transfer, particularly when the heat medium hits the exhaust pipe, leading to localized boiling and reduced heat recovery performance.
Innovation Solution
The implementation of an exhaust heat recovery device with an exhaust restriction portion, such as a tubular diameter-decreased portion, arranged upstream of the heat recovery material to control the exhaust flow and an annular heat medium flow passage that directs the heat medium along the outer periphery of the heat recovery material, reducing turbulence and enhancing heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the heat medium supply pipe extends from the right end and the heat medium collection pipe extends from the left end of the double-circle heat medium flow passage, then the heat medium can flow through the entire heat medium flow passage, but the heat medium immediately hits the exhaust pipe and is distributed in two directions causing turbulence and decreasing heat recovery efficiency
Solution Approach 1:
The heat medium flow passage is divided into a first heat medium flow passage and a second heat medium flow passage. The first passage extends from the heat medium supply pipe to the heat medium collection pipe, while the second passage extends from the heat medium collection pipe to the heat medium supply pipe, creating a segmented flow path that prevents turbulence at the exhaust pipe interface
Solution Approach 2:
The patent introduces a circumferential direction dimension to the heat medium flow by creating a double-circle configuration where heat medium flows in opposite directions in the two passages, transforming the single-direction turbulent flow into a controlled bidirectional flow system that eliminates localized boiling
2Productivity
If the heat medium flows through the heat medium flow passage by being distributed in two directions when hitting the exhaust pipe, then the heat medium can reach the heat recovery material, but the flow of the heat medium is disturbed and heat recovery efficiency decreases
Solution Approach 1:
The heat medium flow is segmented into two separate passages flowing in opposite directions, preventing the turbulent distribution that occurs when heat medium hits the exhaust pipe. This segmentation maintains stable, laminar flow throughout the heat recovery process
Solution Approach 2:
The double-circle configuration creates a periodic flow pattern where heat medium circulates continuously in opposite directions through the two passages, ensuring stable and consistent heat recovery efficiency without flow disturbances
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 prevents a decrease in heat recovery efficiency by stabilizing the exhaust flow and ensuring that the heat medium flows efficiently through the heat recovery material, thereby improving the overall heat recovery efficiency and preventing local boiling.
Implementation Method 1
Heat of high-temperature exhaust (for example, exhaust of an engine of an automobile) flowing inside the exhaust pipe is recovered via the heat recovery material by heat medium such as water flowing through the heat medium flow passage
Data Source
AI summary
An exhaust heat recovery device includes: an exhaust pipe through which exhaust flows; a heat recovery material arranged in the exhaust pipe and recovering heat of the exhaust; a heat medium flow passage through which heat medium recovering the heat recovered by the heat recovery material flows; and an exhaust restriction portion arranged in the exhaust pipe and allowing the exhaust to pass through only part of the heat recovery material.