Heat Cycle Working Fluid Composition to Suppress HFO-1123 Decomposition

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Solution Overview

Problem

The use of HFO-1123 as a working fluid for heat cycles is limited by its self-decomposition under high temperature and high pressure conditions, which affects its durability and refrigerating cycle performance.

Innovation Solution

A working fluid composition comprising HFO-1123 and HFO-1234yf in specific proportions, with HFO-1123 making up at least 21% and at most 39% of the total, is developed to enhance durability and refrigerating cycle performance while minimizing global warming potential.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If HFO-1123 is used as a working fluid for heat cycle, then refrigerating capacity is improved, but self-decomposition occurs under high temperature and high pressure conditions reducing durability

Engineering Contradiction:

Improverefrigerating capacityVSAvoiddurability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent combines HFO-1123 with HFO-1234yf in a specific ratio (HFO-1123: 1-40 mass%, HFO-1234yf: 60-99 mass%) to create a composite working fluid. This mixture maintains the high refrigerating capacity of HFO-1123 while the presence of HFO-1234yf suppresses self-decomposition under high temperature and pressure conditions, thereby improving durability and reliability.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If HFO-1123 is used as a working fluid, then global warming potential is reduced, but self-decomposition reaction occurs under high temperature and high pressure

Engineering Contradiction:

Improveglobal warming potentialVSAvoidself-decomposition reaction

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

HFO-1234yf acts as an intermediary substance that suppresses the self-decomposition reaction of HFO-1123 under high temperature and pressure conditions. The mixture allows HFO-1123 to be used in sufficient quantities to achieve low global warming potential while HFO-1234yf mediates to prevent harmful self-decomposition reactions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If HFO-1123 content is increased to improve refrigerating capacity, then cycle performance is enhanced, but self-decomposition risk increases under high pressure conditions

Engineering Contradiction:

Improvecycle performanceVSAvoidstability under pressure

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes the compositional parameters of the working fluid by controlling the ratio of HFO-1123 to HFO-1234yf. This parameter adjustment allows the system to achieve high cycle performance with sufficient HFO-1123 content while maintaining stability under pressure through the presence of HFO-1234yf that suppresses self-decomposition.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10144856B2Working fluid for heat cycle, composition for heat cycle system, and heat cycle system

Publication Date: 2018.12.04 AGC INC

AI summary

A working fluid for heat cycle contains trifluoroethylene and 2,3,3,3-tetrafluoropropene. The proportion of the total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene based on the entire amount of the working fluid is higher than 90 mass % and at most 100 mass %. The proportion of trifluoroethylene based on the total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene is at least 21 mass % and at most 39 mass %. The working fluid has a low global warming potential and suppressed self-decomposition property. A composition for a heat cycle system contains the working fluid and a heat cycle system employs the composition.