Refrigerant Compressor Discharge Temperature Control
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Solution Overview
Problem
Low global warming potential (GWP) refrigerants, such as R-457A, exhibit higher discharge temperatures than conventional high GWP refrigerants like R-404A, which can limit the operating envelope of low back pressure hermetic reciprocating compressors, particularly in low temperature refrigeration applications, and reduce compressor longevity without active discharge temperature control.
Innovation Solution
A refrigerant composition comprising difluoromethane (R-32) and 2,3,3-tetrafluoropropene (R-1234yf) in specific weight percentages, or including 1,1-difluoroethane (R-152a), is used to replace high GWP refrigerants like R-404A, R-457A, and R-454C, maintaining or improving discharge temperature and heat transport capacity while reducing GWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low GWP refrigerants like R-457A are used, then global warming potential is reduced, but discharge temperature increases
Solution Approach 1:
The patent modifies the refrigerant composition parameters by combining R-32 (15-30 wt%) and R-1234yf (70-85 wt%) in specific proportions. This parameter optimization resolves the contradiction by achieving low GWP (≤150) while maintaining discharge temperatures within the acceptable range of 78.0°C to 102.0°C, unlike R-457A which exceeds this range.
Solution Approach 2:
The patent creates a composite refrigerant system by combining two different refrigerant components (R-32 and R-1234yf) with complementary properties. R-32 provides good cooling performance and appropriate discharge temperature, while R-1234yf contributes to low GWP and heat transport capacity, achieving a balance that neither component could achieve alone.
2Object-affected harmful factors
If low GWP refrigerants are used, then environmental impact is reduced, but compressor operating envelope is limited
Solution Approach 1:
The patent optimizes the refrigerant composition parameters (R-32 at 15-30 wt%, R-1234yf at 70-85 wt%) to match the operating characteristics of low back pressure hermetic reciprocating compressors. This parameter tuning ensures compatibility with compressor design specifications, expanding the operating envelope compared to other low GWP refrigerants.
3Object-affected harmful factors
If low GWP refrigerants are used, then environmental sustainability is improved, but compressor longevity is reduced
Solution Approach 1:
The patent controls the discharge temperature parameter within the range of 78.0°C to 102.0°C through optimized refrigerant composition. This temperature control prevents excessive thermal stress on compressor components, thereby extending compressor service life and longevity while maintaining low GWP characteristics.
4Object-affected harmful factors
If conventional high GWP refrigerants like R-404A are replaced, then environmental performance is improved, but heat transport capacity may be compromised
Solution Approach 1:
The patent creates a composite refrigerant system where R-1234yf (70-85 wt%) provides high heat transport capacity and low GWP, while R-32 (15-30 wt%) enhances cooling performance and maintains appropriate discharge temperature. This composite approach matches or exceeds the heat transport capacity of conventional high GWP refrigerants like R-404A while achieving GWP ≤150.
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 compressor discharge temperatures between 78.0°C and 102.0°C, comparable energy efficiency, and similar or improved refrigerant properties to the replaced refrigerants, extending compressor service life and enabling broader application in low temperature refrigeration.
Implementation Method 1
The refrigerant composition circulates throughout the refrigeration system as part of the heat transfer processes
Implementation Method 2
The refrigerant composition circulates throughout the refrigeration system as part of the heat transfer processes
Implementation Method 3
compressing by low back pressure (LBP) hermetic reciprocating compressor the refrigerant composition. The discharge temperature of the compressor is between 78.0°C and 102.0°C
Data Source
Figure 1
Figure 2
AI summary
A refrigeration system, including a low back pressure (LBP) hermetic reciprocating compressor and a refrigerant composition. The refrigerant composition includes difluoromethane (R-32), and 2,3,3,3-tetrafluoropropene (R‑1234yf).