Method using refrigerant for compressor, compressor, and refrigeration cycle apparatus
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Solution Overview
Problem
Existing refrigeration systems using conventional refrigerants face challenges in managing heat capacity and reliability, particularly when dealing with refrigerants like R32, R410A, R134a, and R404A, which can lead to issues during disproportionation reactions.
Innovation Solution
The use of a refrigerant composition comprising ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 1,3,3,3-tetrafluoropropene (HFO-1234ze) in combination with metal discharge pipes and intake pipe connection sections having increased heat capacity, thickness, and mass per unit length to enhance the system's heat management and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refrigerants (R32, R410A, R134a, R404A) are used in compressors, then the refrigeration system operates with standard heat capacity management, but the system faces reliability issues during disproportionation reactions due to insufficient heat capacity in discharge pipes and intake pipe connection sections
Solution Approach 1:
The patent applies beforehand cushioning by increasing the heat capacity of discharge pipes and intake pipe connection sections before disproportionation reactions can occur. This is achieved by using metal materials with higher specific heat values or increasing the mass and surface area of these components, allowing them to absorb excessive heat generated during disproportionation reactions and prevent rapid temperature increases that would compromise system reliability
Solution Approach 2:
The patent changes the thermal parameters of the discharge pipes and intake pipe connection sections by selecting metal materials with different thermal properties (higher specific heat capacity) or by modifying their physical dimensions (increasing mass per unit length). These parameter changes enable the components to better manage heat during abnormal operating conditions such as disproportionation reactions
2Reliability
If the heat capacity and mass of discharge pipes and intake pipe connection sections are increased to prevent temperature increases during disproportionation reactions, then reliability improves, but the weight and volume of the compressor increase
Solution Approach 1:
The patent applies local quality by selectively increasing the heat capacity and mass only in specific critical components (discharge pipes and intake pipe connection sections) rather than throughout the entire compressor. This targeted approach focuses the additional material where it is most needed for heat management during disproportionation reactions, minimizing the overall weight increase while maintaining reliability in the critical areas
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
This solution effectively manages heat and enhances the reliability of the refrigeration system by preventing rapid temperature increases and pipe damage during potential disproportionation reactions, thereby improving the overall performance and safety of the compressor.
Implementation Method 1
a discharge pipe made of metal having a greater heat capacity than a discharge pipe of a compressor that uses R32 as refrigerant
Data Source
AI summary
The robustness of refrigerant against disproportionation reactions is improved. A method uses, as refrigerant for a compressor, a composition that contains one or two or more selected from a group of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 1,3,3,3-tetrafluoropropene (HFO-1234ze), in which the compressor includes a discharge pipe made of metal having a greater heat capacity than a discharge pipe of a compressor that uses R32, R410A, R134a, or R404A as refrigerant, or a casing that includes an intake pipe connection section made of metal having a greater heat capacity than an intake pipe connection section of a casing of the compressor that uses R32, R410A, R134a, or R404A as refrigerant.