Working fluid for heat cycle, composition for heat cycle system, and heat cycle system
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Solution Overview
Problem
Current working fluids for heat cycles, such as R410A, have high global warming potential and limited refrigerating capacity, and existing alternatives like HFO-1234yf do not provide sufficient cycle performance for conventional air-conditioning applications.
Innovation Solution
A working fluid composition comprising HFO-1123 and HFO-1234yf in specific proportions, ranging from 70 to 100 mass%, is used to achieve balanced refrigerating capacity and coefficient of performance, while minimizing global warming impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1234yf is used as a working fluid, then global warming potential is reduced, but refrigerating capacity becomes insufficient for conventional air-conditioning apparatus
Solution Approach 1:
The patent combines HFO-1234yf with HFO-1123 in a specific mass ratio range (95:5 to 50:50) to create a blended working fluid. This merging allows the composition to achieve both low global warming potential (GWP ≤ 150) and sufficient refrigerating capacity (≥ 40 kW) to operate conventional air-conditioning apparatus, resolving the contradiction between environmental friendliness and performance.
Solution Approach 2:
The patent changes the compositional parameters by specifying precise mass ratio ranges of HFO-1234yf and HFO-1123 (with HFO-1234yf at 50-95 mass% and HFO-1123 at 5-50 mass%). This parameter optimization ensures the working fluid maintains both low GWP and adequate refrigerating capacity, transforming the individual weaknesses of each component into a balanced performance.
2Quantity of substance
If R410A is used as a working fluid, then refrigerating capacity is high, but global warming potential becomes excessive
Solution Approach 1:
The patent changes the chemical composition parameters by replacing R410A (HFC-32/HFC-125 mixture with GWP of 2088) with a new composition of HFO-1234yf and HFO-1123. The specified mass ratios ensure the new working fluid achieves GWP ≤ 150 while maintaining refrigerating capacity of at least 40 kW, thus resolving the contradiction between high performance and low environmental impact.
Solution Approach 2:
The patent creates a composite working fluid by combining two different HFO compounds (HFO-1234yf and HFO-1123) in specific proportions. This composite approach allows the mixture to exhibit both low global warming potential and sufficient refrigerating capacity, overcoming the limitations of using either component alone or traditional HFC-based refrigerants like R410A.
3Use of energy by moving object
If HFO-1123 is used as a working fluid, then coefficient of performance is improved, but refrigerating capacity becomes insufficient
Solution Approach 1:
The patent merges HFO-1123 (which provides high coefficient of performance) with HFO-1234yf (which provides sufficient refrigerating capacity) in a balanced mass ratio. This combination allows the working fluid to achieve both improved energy efficiency and adequate refrigerating capacity, resolving the contradiction between these two performance parameters.
Data Source
AI summary
A working fluid for heat cycle, a composition for a heat cycle system containing the working fluid, and a heat cycle system employing the composition are provided. The working fluid has a low global warming potential and can replace R410A. The working fluid contains trifluoroethylene, 2,3,3,3-tetrafluoropropene, and optionally a hydrofluoroolefin other than trifluoroethylene and 2,3,3,3-tetrafluoropropene. The total proportion of trifluoroethylene and 2,3,3,3-tetrafluoropropene based on the entire amount of the working fluid is from 70 to 100 mass %.