Heat Pump Working Medium Blend for High-Temperature Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

HFO-1123, a working medium for heat pumps, has a lower critical temperature than estimated, leading to unstable heat pump performance at high ambient temperatures, and is flammable, necessitating a solution that enhances flame retardancy and maintains heat pump efficiency.

Innovation Solution

A working medium blend comprising HFO-1123, HFC-134a, HFC-125, HFO-1234yf, HFO-1234ze, and HFO-1243zf, with specific composition ratios to increase critical temperature and improve flame retardancy, while minimizing global warming impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If HFO-1123 is used as a working medium, then global warming influence is reduced, but heat pump performance becomes unstable at high temperatures due to low critical temperature

Engineering Contradiction:

Improveglobal warming influenceVSAvoidheat pump performance stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent uses a composite working medium consisting of HFO-1123 combined with HFC-134a and HFC-125 in specific proportions. This composite formulation maintains the low global warming potential of HFO-1123 while the HFC components raise the overall critical temperature to above 70°C, ensuring stable heat pump performance at high operating temperatures.

Inventive Principle:

Principle #40Composite materials

2Productivity

If HFO-1123 is used as a working medium, then excellent heat pump performance is obtained, but flammability increases

Engineering Contradiction:

Improveheat pump performanceVSAvoidflammability

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces HFC-134a and HFC-125 as intermediary substances that mix with HFO-1123. These HFC components act as flame-retardant agents that suppress the flammability of HFO-1123 while maintaining its excellent heat pump performance characteristics, achieving a safe and effective working medium blend.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9624413B2Working medium for heat pump, and heat pump system

Publication Date: 2017.04.18 AGC INC

AI summary

A working medium for a heat pump, including: 1,1,2-trifluoroethylene; at least one of 1,1,1,2-tetrafluoroethane and pentafluoroethane; and at least one of 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, and 3,3,3-trifluoropropene.