Modular Mini-Channel Heat Exchanger for Low-Delta-T Surface Heating
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Solution Overview
Problem
Current heat exchanger systems for geothermal applications face challenges in efficiently distributing heat to multiple sinks with varying power requirements, leading to temperature losses and inefficiencies, particularly in scenarios like traffic sign heating where high power ranges and small temperature differences are involved, and they struggle with preventing frost obstruction and effective condensate backflow.
Innovation Solution
A modular heat exchanger unit with a large number of directly adjacent mini-ducts in a planar arrangement, connected to a supply duct, utilizing a multi-phase working medium, which maximizes heat transfer surface area and efficiency by optimizing channel diameters and configurations for both co-current and counter-current principles, allowing for efficient heat distribution and condensate return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single plate heat exchanger with attached heat pipes is used, then the structure is simple, but the heat distribution efficiency is insufficient and temperature losses occur
Solution Approach 1:
The patent divides the heat exchanger into multiple independently integrated heat pipes instead of using a single plate with attached pipes. Each heat pipe is fully integrated into the exchanger body, creating separate heat transfer channels that reduce thermal resistance and improve heat distribution efficiency while maintaining structural compactness.
Solution Approach 2:
The patent merges the heat pipe functionality directly into the heat exchanger body through full integration, eliminating the need for separate attachment components. This combining of functions reduces thermal interface resistance and improves overall heat transfer efficiency while simplifying the assembly structure.
2Manufacturing precision
If distribution pipes with precise geometric dimensions are used, then heat flow distribution is accurate, but manufacturing and assembly precision requirements become extremely high
Solution Approach 1:
The patent segments the heat distribution function into multiple standardized heat pipe units with uniform cross-sections. This segmentation allows for modular manufacturing where each unit can be produced independently with standard tolerances, then assembled together to achieve the desired heat distribution pattern without requiring extreme precision in individual components.
Solution Approach 2:
The patent changes the design parameter from custom-shaped distribution pipes requiring precise geometric dimensions to standardized heat pipes with uniform circular cross-sections. This parameter change simplifies manufacturing while the number and arrangement of heat pipes can be adjusted to achieve the desired heat distribution characteristics.
3Power
If the heat exchanger is designed for high power ranges, then it can handle traffic sign heating requirements, but the temperature difference available for heat transfer becomes very small
Solution Approach 1:
The patent uses multiple parallel heat pipe channels to segment the high power requirement into numerous smaller heat transfer paths. This allows the system to handle high total power while maintaining efficient heat transfer in each individual channel, even with small temperature differences, by increasing the total heat transfer surface area through parallel pathways.
Solution Approach 2:
The patent transitions from relying on large temperature differences in single channels to achieving high power transfer through increased surface area in multiple dimensions. By arranging numerous heat pipes in parallel arrays, the system achieves high total heat transfer capacity through cumulative surface area rather than through large temperature gradients.
4Ease of operation
If capillary tubes with small diameters are used, then condensate can flow back horizontally, but the pressure drop becomes so high that gas transport is impeded
Solution Approach 1:
The patent segments the condensate return function into dedicated return channels separate from the gas transport paths. This segmentation allows condensate to flow back through specific channels with appropriate geometry and inclination, while gas transport occurs through separate channels without experiencing the same pressure losses, resolving the conflict between condensate management and gas flow efficiency.
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
The solution enhances heat transfer efficiency, reduces temperature losses, and effectively manages condensate return, achieving high energy density and improved performance even with small temperature differences, thus surpassing existing solutions in terms of heat use, material usage, and cost-effectiveness.
Implementation Method 1
transfer the latent heat originating from the heat source from the heated gaseous portion of the working medium to the component to be heated
Implementation Method 2
at least one gas-tight heat exchanger is designed in a modular manner with a large number of directly adjacent mini-ducts
Implementation Method 3
at least one gas-tight heat exchanger is designed in a modular manner with a large number of directly adjacent mini-ducts in a planar arrangement
Data Source
Figure 1~3
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Figure 6~7
AI summary
The invention relates to a heat transfer unit (1) for heating systems and surfaces, which can be connected to at least one geothermal energy probe (21) as a heat source (2) operating with a multi-phase working fluid and to a component to be heated, and which comprises at least one heat exchanger (11) and transport lines (12) for the gaseous or liquid working fluid. At least one gas-tight heat exchanger (11) is designed in module form having a plurality of directly adjoining modular mini-channels (111), depending on the power requirements, in a planar arrangement for transferring the latent heat arising from the heat source (2) from the heated gaseous portion of the working fluid to the component (3) to be heated, said mini-channels (111) being connected to at least one supply channel (114, 115) and having a diameter of 0.3 to 6 mm. The heat transfer unit (1) can be integrated into the region of a switch blade (32) as a railway point heater.