HCFO-1224yd Refrigerant Composition for Thermal Stability

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Solution Overview

Problem

Current heat cycle systems using 1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd) face instability issues under compression and heating conditions, leading to poor performance and short lifespan, despite its low global warming potential and excellent cycle performance.

Innovation Solution

A composition for a heat cycle system is developed, incorporating HCFO-1224yd with a stabilizer blend, including oxidation resistance improvers and heat resistance improvers, to enhance the stability of the working medium, along with refrigerant oils and optional components like HFCs, HFOs, and hydrofluoroolefins, optimizing the mass ratio of geometric isomers and stabilizer content.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If HCFO-1224yd is used as a working medium, then global warming potential is reduced and cycle performance is improved, but stability under compression and heating conditions deteriorates

Engineering Contradiction:

Improveglobal warming potentialVSAvoidstability under compression and heating

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

A stabilizer compound is introduced as an intermediary substance to protect HCFO-1224yd from decomposition under compression and heating conditions. The stabilizer acts as a mediator that absorbs the harmful effects of high temperature and pressure, preventing the working medium from deteriorating while maintaining its excellent thermodynamic properties and low global warming potential.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite working medium system by combining HCFO-1224yd with a stabilizer compound. This composite formulation allows the system to benefit from both the low global warming potential and excellent cycle performance of HCFO-1224yd and the stability-providing properties of the stabilizer, resolving the contradiction between performance and stability.

Inventive Principle:

Principle #40Composite materials

2Productivity

If HCFO-1224yd is used as a working medium, then cycle performance is improved, but lifespan and reliability deteriorate

Engineering Contradiction:

Improvecycle performanceVSAvoidlifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The stabilizer compound serves as a protective intermediary that extends the lifespan of HCFO-1224yd by preventing its decomposition during repeated compression and heating cycles. This mediator substance absorbs the mechanical and thermal stress, allowing the working medium to maintain its performance characteristics over a longer operational lifetime.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stabilizer provides beforehand cushioning against the damaging effects of compression and heating by being present in the working medium before stress occurs. This preventive measure cushions the working medium against degradation, ensuring long-term reliability without compromising cycle performance.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS10138403B2Composition for heat cycle system and heat cycle system

Publication Date: 2018.11.27 AGC INC

AI summary

There are provided a composition for a heat cycle system containing a working medium for heat cycle that has a low global warming potential and high stability, which can be used as a substitute for HFC-134a and HFC-245fa, and a heat cycle system using this composition. The composition for a heat cycle system contains: a working medium for heat cycle containing 1-chloro-2,3,3,3-tetrafluoropropene; and a stabilizer suppressing deterioration of the working medium for heat cycle such as an oxidation resistance improver, a heat resistance improver, or a metal deactivator, and the heat cycle system uses this composition for a heat cycle system.