Heat exchanger, heat exchange method using heat exchanger, heat transport system using heat exchanger, and heat transport method using heat transport system
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Solution Overview
Problem
Existing heat exchangers face challenges in controlling bubble generation and heat transfer efficiency during boiling, as controlling bubble locations, diameters, and frequency is difficult, leading to limited improvement in the heat transfer coefficient.
Innovation Solution
A heat exchanger with a heat transfer member featuring alternately arranged high and low thermal conductivity regions in a striped pattern on its surface, where the high conductivity region has a width between 2.5 mm and 7.5 mm and the low conductivity region has a width between 0.1 mm and 1.0 mm, allowing for controlled bubble generation and enhanced heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grooves or irregularities are formed on the heat transfer member surface to facilitate boiling, then bubble generation is improved, but control of bubble locations, diameters, and frequency becomes difficult
Solution Approach 1:
The heat transfer member surface is divided into multiple regions with different thermal conductivities (high thermal conductivity regions and low thermal conductivity regions). This local differentiation allows specific areas to control bubble generation while other areas facilitate heat transfer, resolving the contradiction between improving heat transfer efficiency and enabling bubble control.
Solution Approach 2:
The surface of the heat transfer member is segmented into alternating high and low thermal conductivity regions in a striped pattern. This segmentation creates distinct zones that can independently control different aspects of boiling, allowing both efficient heat transfer and precise bubble management to occur simultaneously.
2Ease of manufacture
If the heat transfer member surface is made uniform to simplify manufacturing, then manufacturing precision is improved, but bubble control capability deteriorates
Solution Approach 1:
Instead of making the entire surface uniform, the invention applies local quality variation by creating high and low thermal conductivity regions in specific patterns. This allows the surface to have different properties in different locations, enabling precise bubble control while maintaining manufacturing feasibility through standardized patterning processes.
Solution Approach 2:
The heat transfer member incorporates composite structures with materials of different thermal conductivities arranged in alternating regions. This composite approach enables precise control over heat distribution and bubble generation characteristics while allowing each material region to be manufactured using appropriate techniques for its specific properties.
3Temperature
If high thermal conductivity material is used throughout the heat transfer member, then heat conduction is improved, but bubble generation control capability is lost
Solution Approach 1:
The heat transfer member incorporates local quality variation by creating alternating high and low thermal conductivity regions. The high thermal conductivity regions ensure efficient heat conduction from the heat source, while the low thermal conductivity regions control bubble generation and detachment. This local differentiation resolves the contradiction between maintaining high heat conduction efficiency and enabling bubble control capability.
Solution Approach 2:
The heat transfer member is segmented into functional zones with different thermal conductivities. This segmentation allows the high thermal conductivity regions to focus on heat conduction while the low thermal conductivity regions focus on bubble control, enabling both functions to operate optimally without interfering with each other.
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 enables precise control of bubble generation and improves the heat transfer coefficient, facilitating efficient heat exchange and transport by stabilizing boiling and increasing heat exchange efficiency.
Implementation Method 1
A first thermal conductivity of the first heat conduction region may be greater than a second thermal conductivity of the second heat conduction region
Implementation Method 2
configured to perform heat exchange by boiling a heat medium
Implementation Method 3
a gas that is generated based on boiling of the liquid
Data Source
AI summary
A heat exchanger is configured to perform heat exchange by boiling a liquid by heat transfer from a heat source to the liquid through a heat transfer member. In the heat exchanger, a first heat conduction region and a second heat conduction region are alternately provided in a form of stripes on a surface on a side that contacts the liquid such that the liquid boils via a heat transfer member.