Refrigerant Mixture Composition for Low-GWP Wide-Temperature Cooling
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Solution Overview
Problem
Existing refrigerants used in cooling systems, particularly for test chambers, face challenges such as high global warming potential (GWP), flammability, temperature glide issues, and difficulty in maintaining precise temperature stability, which complicates system design and operation.
Innovation Solution
A refrigerant mixture comprising 69 to 82 mol% carbon dioxide, 7 to 15 mol% difluoromethane, and 1 to 29 mol% 1,1,1,2-tetrafluoroethane, which is non-flammable and has a low GWP, allowing for flexible adaptation to various applications and maintaining temperature stability, even in dynamic cooling systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carbon dioxide is used as a refrigerant component to reduce GWP and flammability, then environmental safety improves, but the freezing point increases making it difficult to achieve temperatures below -56.6°C
Solution Approach 1:
The patent uses a composite refrigerant mixture containing carbon dioxide (69-82 mol%), difluoromethane (7-15 mol%), and 1,1,1,2-tetrafluoroethane (1-29 mol%). This composite approach combines the low-GWP, non-flammable properties of CO2 with the low-freezing-point characteristics of the fluorinated hydrocarbons, enabling temperatures below -56.6°C while maintaining environmental safety.
Solution Approach 2:
The patent optimizes the compositional parameters of the refrigerant mixture, specifically adjusting the mole percentages of each component to achieve the desired balance between freezing point depression and environmental performance. The specified ranges (69-82 mol% CO2, 7-15 mol% difluoromethane, 1-29 mol% 1,1,1,2-tetrafluoroethane) represent parameter optimization to resolve the temperature limitation.
2Temperature
If zeotropic refrigerant mixtures are used to achieve low temperatures, then temperature range improves, but temperature glide causes temperature instability and requires complex system adaptations
Solution Approach 1:
The patent carefully selects and optimizes the compositional parameters to minimize temperature glide while maintaining the ability to achieve low temperatures. The specific mole percentage ranges are designed to balance temperature range extension with temperature stability, reducing the need for complex system adaptations.
3Object-affected harmful factors
If flammable refrigerants are used to achieve low GWP, then environmental performance improves, but safety regulations and system complexity increase
Solution Approach 1:
The patent creates a composite refrigerant mixture that combines non-flammable carbon dioxide with fluorinated hydrocarbons in specific proportions. This composite approach achieves low GWP (below 150) while maintaining non-flammability, thereby avoiding the safety regulations and system complexity associated with flammable refrigerants.
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 refrigerant mixture achieves low GWP, reduces flammability risks, and enables precise temperature control within a wide range (-60°C to +180°C) with minimal system modifications, enhancing safety and cost-effectiveness.
Implementation Method 1
a cooling device with a cooling circuit with at least one heat exchanger in which the refrigerant undergoes a phase change
Data Source
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AI summary
The invention relates to a refrigerant for a cooling device (10) with a cooling circuit (11) with at least one heat exchanger (12), wherein the refrigerant undergoes a phase change in the heat exchanger, wherein the refrigerant is a refrigerant mixture of a proportion of carbon dioxide, a proportion of difluoromethane and a proportion of 1,1,1,2-tetrafluoroethane, wherein the proportion of carbon dioxide in the refrigerant mixture is 54 to 92 mol percent, the proportion of difluoromethane is 1 to 30 mol percent and the proportion of 1,1,1,2-tetrafluoroethane is 1 to 29 mol percent.