Heat Transfer Fluid Solubility Reduction via Polar Agents
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Solution Overview
Problem
Flammable gases, such as alkanes and alkenes, can dissolve in heat transfer fluids due to temperature changes, leading to potential leaks and inefficiencies in heat pump systems, and existing solutions like double-walled heat exchangers are costly and reduce efficiency.
Innovation Solution
Adding a polar agent soluble in water, such as salts (e.g., KCl, NaCl, NaBr, or ionic liquids like [P66614]Cl, and insoluble agents like silicone oil or polyoxyethylene to reduce solubility and surface tension, allowing for effective separation of gases using conventional gas separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double-walled heat exchangers are used to prevent refrigerant leakage, then safety is improved, but heat transfer efficiency deteriorates due to poor thermal conductivity and insulation effects
Solution Approach 1:
The invention extracts the harmful dissolved refrigerant from the heat transfer fluid by adding a polar substance that reduces refrigerant solubility, allowing the refrigerant to separate as gas bubbles that can be removed by gas separators. This eliminates the need for double-walled heat exchangers while maintaining safety.
Solution Approach 2:
The invention changes the chemical composition parameter of the heat transfer fluid by adding polar substances (such as alcohols, carboxylic acids, or their esters) that alter the solubility characteristics of the refrigerant, transforming it from soluble to insoluble state, thereby enabling separation without requiring complex heat exchanger structures.
2Reliability
If glycol is added to the heat transfer fluid to prevent freezing, then antifreeze protection is improved, but refrigerant solubility increases leading to foaming and separation problems
Solution Approach 1:
The invention creates a composite heat transfer fluid by combining glycol (for antifreeze protection) with polar substances (such as alcohols, carboxylic acids, or their esters). This composite formulation maintains the desirable properties of glycol while adding the ability to reduce refrigerant solubility and prevent foaming.
Solution Approach 2:
The polar substances act as intermediaries between the glycol and the refrigerant. They modify the interaction between glycol and refrigerant, reducing the refrigerant's solubility in the heat transfer fluid while maintaining the antifreeze properties of glycol.
3Adaptability or versatility
If heat transfer fluid circuit operates with temperature fluctuations, then system versatility is improved, but refrigerant outgassing at unfavorable locations increases
Solution Approach 1:
The invention performs preliminary action by adding polar substances to the heat transfer fluid before temperature fluctuations occur. This pre-treatment ensures that refrigerant solubility is reduced in advance, preventing outgassing at unfavorable locations during subsequent temperature changes.
Solution Approach 2:
The invention changes the solubility parameter of the heat transfer fluid by adding polar substances, making the refrigerant less soluble across a range of temperatures. This parameter change ensures that temperature fluctuations do not cause harmful outgassing effects.
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
Prevents flammable gases from dissolving in heat transfer fluids, enabling complete separation via gas separators and maintaining system efficiency while ensuring safety and reducing foaming issues.
Implementation Method 1
Adding a polar agent soluble in water, such as salts (e.g., KCl, NaCl, NaBr, or ionic liquids like [P66614]Cl, and insoluble agents like silicone oil or polyoxyethylene to reduce solubility
Implementation Method 2
both glycols increase the surface tension, which can lead to foaming when gas bubbles are released. To prevent foaming, defoamers are commonly used in industrial applications; these are surfactants that are insoluble in the foaming medium.
Data Source
AI summary
Method for reducing the solubility of hydrocarbons dissolved in heat transfer fluid, wherein the heat transfer fluid is a mixture of water, antifreeze and corrosion inhibitors, by adding a polar agent which is soluble in water to the heat transfer fluid.