Inside air-conditioning device
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Solution Overview
Problem
There is a lack of studies on the appropriate refrigerants with low global warming potential (GWP) for use in indoor air-conditioning devices, despite growing concerns about global warming.
Innovation Solution
The use of a refrigerant circuit containing at least cis-1,2-difluoroethylene (HFO-1132(Z)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf) in various mass ratios, which can serve as alternatives to traditional refrigerants like R134a, R404A, and others, while maintaining or exceeding their coefficient of performance (COP) and refrigerating capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional refrigerants like R134a or R404A are used, then the air-conditioning device achieves adequate cooling performance, but the global warming potential (GWP) is high
Solution Approach 1:
The patent changes the chemical composition parameters of the refrigerant by using HFO-1132(Z) and HFO-1234yf with specific mass ratios (53.0-59.5% and 47.0-40.5% respectively), thereby reducing GWP while maintaining cooling performance through optimized molecular structure and thermodynamic properties
Solution Approach 2:
The patent employs a composite refrigerant system combining two different HFO compounds (HFO-1132(Z) and HFO-1234yf) in specific proportions, creating a mixed refrigerant that leverages the complementary thermodynamic properties of each component to achieve both low GWP and high cooling efficiency
2Object-affected harmful factors
If new low GWP refrigerants are used, then environmental impact is reduced, but the coefficient of performance (COP) and refrigerating capacity may be compromised
Solution Approach 1:
The patent optimizes the mass ratio parameters of HFO-1132(Z) and HFO-1234yf within specific ranges (53.0-59.5% and 47.0-40.5%) to fine-tune the thermodynamic properties, ensuring that COP and refrigerating capacity meet or exceed traditional refrigerant performance while maintaining low GWP
Solution Approach 2:
The patent uses a balanced composition of two HFO compounds where each component contributes partially to the overall performance, with their combined effect exceeding what either compound could achieve alone, thereby ensuring reliable COP and refrigerating capacity
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 refrigerant composition achieves a COP and refrigerating capacity comparable to or greater than traditional refrigerants while having a significantly reduced GWP, making it an effective and environmentally friendly alternative.
Implementation Method 1
an evaporator... The refrigerant contains at least 1,2-difluoroethylene
Implementation Method 2
heat cycle system... refrigerant circuit includes a compressor, a condenser, a decompressor, and an evaporator
Implementation Method 3
a condenser... heat cycle system
Implementation Method 4
a compressor... refrigerant circuit includes a compressor
Implementation Method 5
a decompressor... refrigerant circuit includes a decompressor
Data Source
AI summary
An inside air-conditioning device includes a refrigerant circuit (50) and a refrigerant that is sealed in the refrigerant circuit (50). The refrigerant circuit (50) includes a compressor (10), a condenser (25), an electronic expansion valve (13), and an evaporator (17). The refrigerant contains at least 1,2-difluoroethylene.