Refrigeration apparatus
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Solution Overview
Problem
Current two-stage refrigeration apparatuses require improvement in operational efficiency, particularly in heat exchange processes.
Innovation Solution
The apparatus includes two cycles with a heat exchanger where at least one refrigerant is a mixture containing 1,2-difluoroethylene (HFO-1132(E)), enhancing heat exchange efficiency, and the refrigerant composition is optimized within specific ternary composition diagrams to match the performance of R410A in terms of GWP, refrigeration capacity, and COP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a two-stage refrigeration apparatus with HFC or HFO refrigerant in the high-temperature-side cycle and carbon dioxide refrigerant in the low-temperature-side cycle is used, then the refrigeration apparatus can achieve low GWP, but the operational efficiency particularly in heat exchange processes requires improvement
Solution Approach 1:
The patent changes the chemical composition parameters of the refrigerant by using a specific mixture containing HFO-1132(E) with defined concentration ranges (5-50 mass%) in the high-temperature-side cycle. This parameter change optimizes both the environmental properties (low GWP) and thermodynamic properties (heat exchange efficiency) of the refrigerant system
Solution Approach 2:
The patent employs a composite refrigerant mixture combining HFO-1132(E) with other refrigerants (such as R32, R1234yf, or R134a) to create a blended refrigerant that achieves synergistic effects. This composite approach allows the system to maintain low GWP while improving heat exchange performance through the complementary properties of different refrigerant components
2Productivity
If a refrigerant mixture containing HFO-1132(E) is used in the heat exchanger, then the efficiency of heat exchange is enhanced, but the refrigerant composition must be precisely controlled within specific ternary composition ranges
Solution Approach 1:
The patent defines specific parameter ranges for refrigerant composition (HFO-1132(E) at 5-50 mass%, and when combined with R32 and/or R1234yf, within specified ternary composition diagrams). These controlled parameter changes ensure optimal heat exchange efficiency while providing clear manufacturing specifications for consistent refrigerant blending
Solution Approach 2:
The patent applies different composition ratios of HFO-1132(E) and other refrigerants to different specific applications and operating conditions. By optimizing the local composition quality for specific heat exchange scenarios, the system achieves enhanced performance while maintaining controllable manufacturing parameters for each application case
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 solution enhances the efficiency of heat exchange in the heat exchanger, achieving refrigeration capacity and COP comparable to R410A while maintaining low GWP and flammability, thus improving the overall operational efficiency of the refrigeration apparatus.
Implementation Method 1
The first heat absorber and the second radiator constitute a heat exchanger. In the heat exchanger, heat is exchanged between the first refrigerant flowing through the first heat absorber and the second radiator refrigerant through the second radiator.
Implementation Method 2
The first refrigerant flowing through the first radiator of the first cycle releases heat into outside air.
Implementation Method 3
The first refrigerant flowing through the first heat absorber of the first cycle takes away heat from outside air.
Data Source
AI summary
A two-stage refrigeration apparatus (500) includes a first cycle (510) and a second cycle (520). The first cycle (510) includes a first compressor (511), a first condenser (512), a first expansion mechanism (513), and a first evaporator (514) that are arranged in such a manner as to be connected to the first cycle. A first refrigerant circulates through the first cycle. The second cycle (520) includes a second downstream-side condenser (523) and a second evaporator (527) that are arranged in such a manner as to be connected to the second cycle. A second refrigerant circulates through the second cycle. The first evaporator (514) and the second downstream-side condenser (523) constitute a cascade condenser (531). In the cascade condenser (531), heat is exchanged between the first refrigerant and the second refrigerant. At least one of the first refrigerant and the second refrigerant is a refrigerant mixture containing at least 1,2-difluoroethylene (HFO-1132(E)).