High-Temperature Heat Pump Refrigerant Blend for Low-GWP Heat Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current high-temperature heat pumps using hydrofluorocarbons (HFCs) have high global warming potential (GWP) and insufficient environmental compatibility, necessitating a coolant with superior heat transmission performance and low GWP for efficient heat transmission at high temperatures.
Innovation Solution
A heat transmission method utilizing a composition predominantly containing cis-1,3,3-tetrafluoropropene or trans-1,3,3-tetrafluoropropene, with optional additives like trans-1-chloro-3,3-trifluoropropene or 1,1,1,3,3-pentafluoropropane, which are non-flammable or slightly flammable, offering excellent heat cycle characteristics and low environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrofluorocarbon (HFC) coolant is used in high-temperature heat pumps, then heat transmission performance is improved, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the coolant by using hydrofluoroolefin (HFO) compounds with specific molecular structures (containing carbon-carbon double bonds) instead of conventional HFCs. This parameter change achieves both low GWP (less than 150) and adequate heat transmission performance for high-temperature heat pumps operating at condensation temperatures of 70°C or higher.
Solution Approach 2:
The patent employs composite coolant formulations by mixing different HFO compounds (such as HFO-1234ze, HFO-1234yf, HFO-1225ye) with specific mass ratios. This composite approach allows optimization of both environmental properties (low GWP) and thermodynamic properties (heat transmission performance) that cannot be achieved with single compounds alone.
2Reliability
If conventional HFC coolant is used, then heat cycle characteristics are sufficient, but environmental compatibility deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the coolant by selecting HFO compounds with specific physical and chemical properties (molecular weight, saturation state, functional groups) that enable adequate heat cycle performance while achieving low GWP values less than 150, thus improving environmental compatibility without sacrificing reliability.
3Object-affected harmful factors
If HFO coolant with low GWP is used, then environmental impact is reduced, but heat transmission performance at high temperature becomes insufficient
Solution Approach 1:
The patent uses composite formulations of multiple HFO compounds (e.g., mixing HFO-1234ze, HFO-1234yf, and HFO-1225ye in specific ratios) to achieve synergistic effects. The composite mixture maintains low GWP while improving heat transmission performance at high temperatures through complementary properties of different components, overcoming the limitations of individual HFO compounds.
Solution Approach 2:
The patent optimizes parameters such as the mass ratios of different HFO components, the presence of carbon-carbon double bonds, and molecular structure characteristics to enhance heat transmission performance while maintaining low GWP, enabling HFO coolants to function effectively in high-temperature heat pump applications.
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 proposed method achieves a global warming potential of less than 150, enabling efficient heat transmission at high temperatures with reduced environmental burden, superior heat cycle performance, and compatibility with existing compressor and condenser systems.
Implementation Method 1
a heat transmission method utilizing a composition predominantly containing cis-1,3,3-tetrafluoropropene or trans-1,3,3-tetrafluoropropene... enabling efficient heat transmission at high temperatures
Implementation Method 2
efficient heat transmission at high temperatures with reduced environmental burden, superior heat cycle performance
Data Source
AI summary
A heat transmission method using a high-temperature heat pump system accommodating a heat transmission composition includes the step of evaporating the heat transmission composition, the step of compressing the heat transmission composition, the step of condensing the heat transmission composition, and the step of decreasing the pressure of the heat transmission composition at a temperature of 70° C. or higher, which are performed sequentially. The heat transmission composition contains cis-1,3,3,3-tetrafluoropropene at a mass ratio of 95.0% by mass or more and 99.9% by mass or less, and contains trans-1,3,3,3-tetrafluoropropene or 2,3,3,3-tetrafluoropropene at a mass ratio of 0.1% by mass or more and 5.0% by mass or less; and the heat transmission composition has a condensation temperature of 70° C. or higher.