Two-Phase Radiator Fluid Composition to Reduce Overheating and Noise
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Solution Overview
Problem
Heat transfer fluid radiators operating in two-phase mode face challenges such as overheating of the heating element, difficulty in pressure regulation, noise due to vapor bubble collapse, and mechanical robustness issues, which affect efficiency and safety.
Innovation Solution
A radiator design using a mixture of at least two different heat transfer liquids with distinct boiling temperatures, where the liquid with the lower boiling point constitutes a significant volume, ensuring a minimum liquid level and reducing vapor pressure, combined with an electrical resistance heating system that allows for easier regulation and optimized connection zones to minimize fluid droplets and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heat transfer fluid radiator operates in two-phase mode with a single liquid, then heat transfer efficiency is improved through latent heat of condensation, but the heating element overheats when liquid volume is too low
Solution Approach 1:
The patent changes the physical-chemical parameters of the heat transfer fluid by using a mixture of two liquids with different boiling points instead of a single liquid. This composition change ensures that the lower-boiling liquid vaporizes first to provide latent heat for efficient heating, while the higher-boiling liquid remains to maintain a minimum liquid level, preventing heating element overheating
Solution Approach 2:
The patent applies composite material principle by creating a composite heat transfer fluid consisting of two different liquids (e.g., water and ethanol, or water and isopropanol) with complementary properties. The composite mixture combines the high latent heat of vaporization benefit with the safety benefit of maintained liquid level, resolving the contradiction between efficiency and reliability
2Productivity
If vaporization rate is increased to improve heating performance, then heat transfer efficiency improves, but fluid droplets are generated that disturb radiator operation
Solution Approach 1:
The patent modifies the vaporization parameters by using a two-liquid mixture where the higher-boiling liquid has lower volatility. This parameter change reduces the overall vapor generation rate and suppresses droplet formation, allowing efficient heating without the harmful droplet effect
3Loss of energy
If vapor bubbles are generated for heat transfer, then latent heat utilization is improved, but noise is generated during vapor bubble collapse
Solution Approach 1:
The patent changes the phase change parameters by using a two-liquid mixture with different boiling points. The higher-boiling liquid reduces the intensity and frequency of vapor bubble formation and collapse, thereby reducing noise while still utilizing latent heat for efficient heating through the lower-boiling liquid
4Stability of the object's composition
If a two-phase heat transfer system is used, then temperature distribution homogeneity is improved, but mechanical robustness requirements increase due to pressure
Solution Approach 1:
The patent changes the pressure parameters by using a two-liquid mixture where the higher-boiling liquid reduces vapor pressure. This parameter change maintains the temperature homogeneity benefit of two-phase operation while reducing the mechanical strength requirements of the radiator structure
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 provides improved regulation of the heating element, reduces noise, and optimizes the radiator's mechanical design, ensuring efficient and safe operation by maintaining a stable temperature distribution and lower mechanical stress.
Implementation Method 1
an electrical resistance heating system that allows for easier regulation
Implementation Method 2
the heat transfer fluid is vaporized, said vapor then rising in the internal structure of the radiator
Implementation Method 3
due to the temperature of the walls of said heating body, which is lower than that of the steam, the latter condenses. The condensate thus formed is in liquid form
Implementation Method 4
at the level of which heat transfer takes place
Data Source
Figure 1
Figure 2~6
AI summary
This radiator for domestic heating with a heat-transfer fluid operating in two-phase form comprises: a reservoir (3) of said heat-transfer fluid; a hot source (6), intended to raise the temperature of said heat-transfer fluid to a temperature such that it causes said fluid to undergo a change of phase; a heater, at which the heat transfer with the ambient air takes place, having n channels (4), communicating in a lower zone with the reservoir (3), it being possible for n to be equal to 1. According to the invention, the heat-transfer fluid is a mixture of at least two different heat-transfer liquids, the heat-transfer liquids having between them boiling points differing by at least ten degrees Celsius, and the liquid with the lowest boiling point representing 70% to 95% of the volume of the mixture for a mixture temperature of about 200°C.