Reactive Working Fluids for Thermodynamic Cycles
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Solution Overview
Problem
Existing thermodynamic machines face inefficiencies due to irreversible side reactions of organic working fluids, environmental impact, and safety concerns, particularly with refrigerants causing global warming and ozone depletion.
Innovation Solution
A reactive working fluid that forms a monomer/dimer couple through reversible Van der Waals bonds during thermodynamic cycles, avoiding covalent bond changes, enhancing efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic working fluids are used in thermodynamic cycles, then energy conversion is enabled, but irreversible side reactions occur outside thermal stability range causing decreased efficiency
Solution Approach 1:
The patent changes the thermal stability parameter of working fluids by selecting compounds with higher decomposition temperatures. The specified compounds (acetone, acetonitrile, dimethyl carbonate, etc.) have thermal stability ranges that encompass the operating temperature ranges of various thermodynamic cycles, ensuring chemical stability while enabling efficient energy conversion.
Solution Approach 2:
The patent uses composite or mixed working fluid compositions combining multiple compounds with complementary properties. These mixtures are designed to maintain chemical stability across the full thermal range while optimizing energy conversion efficiency through synergistic effects of the component compounds.
2Ease of operation
If conventional refrigerants are used in heat pumps and refrigeration machines, then cooling/heating function is achieved, but adverse environmental impact occurs through global warming potential and ozone depletion
Solution Approach 1:
The patent changes the environmental impact parameters by selecting working fluids with zero ozone depletion potential and low global warming potential. The specified compounds (acetone, acetonitrile, dimethyl carbonate, ethyl methyl carbonate, propylene carbonate) are environmentally benign alternatives to conventional refrigerants like CFCs and HCFCs, maintaining functionality while eliminating harmful environmental effects.
3Ease of operation
If conventional refrigerants are used in heat pumps and refrigeration machines, then cooling/heating function is achieved, but safety drawbacks occur such as flammability
Solution Approach 1:
The patent changes the safety parameters by selecting working fluids with appropriate flash points and flammability characteristics. The specified compounds have been chosen to balance safety requirements with thermodynamic performance, providing safer alternatives to highly flammable conventional refrigerants while maintaining effective cooling and heating functions.
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 reactive fluid increases energy conversion efficiency by up to 200% in power plants and doubles the coefficient of performance in heat pumps, while being environmentally friendly and safer.
Implementation Method 1
The working fluid comprises a compound capable of reversibly associating/dissociating, during each thermodynamic cycle, by formation/breakage of Van der Waals bonds
Implementation Method 2
The working fluid or the compound undergoes, partly only or at least partly or in its entirety: a dissociation into monomers during a compression phase of the thermodynamic cycle
Implementation Method 3
an association into dimers during a cooling phase of the thermodynamic cycle
Data Source
Figure 1
AI summary
Reactive working fluid for cyclic thermodynamic conversion machines, said working fluid, forming a monomer/dimer couple, said working fluid comprising a compound capable of reversibly associating/dissociating, during each thermodynamic cycle, by formation/breakage of Van der Waals bonds.