Binary refrigeration device
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Solution Overview
Problem
There is a demand for improving heat exchange efficiency in binary refrigeration circuits, particularly in plate heat exchangers.
Innovation Solution
The binary refrigeration apparatus incorporates a plate heat exchanger with wave-shaped heat transfer plates and a low-temperature side refrigerant flow configured to generate turbulent flow through spiral or double-tube heat exchangers, enhancing heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a plate heat exchanger is used in a binary refrigeration circuit, then heat exchange between high-temperature and low-temperature refrigerants is achieved, but heat exchange efficiency is insufficient
Solution Approach 1:
The patent applies curvature by forming wave-shaped patterns on the heat transfer plates. The convex and concave portions create curved flow paths that generate turbulent flow, enhancing heat exchange efficiency. This transforms the flat plate structure into a three-dimensional wave configuration, improving thermal transfer performance without increasing device complexity.
Solution Approach 2:
The patent changes the flow regime parameter from laminar to turbulent flow by introducing wave-shaped structures. This parameter change significantly improves heat exchange efficiency as turbulent flow enhances mixing and thermal transfer between the high-temperature and low-temperature refrigerant passages.
2Loss of energy
If wave-shaped heat transfer plates are introduced to improve heat exchange efficiency, then turbulent flow is generated, but device complexity increases
Solution Approach 1:
The wave-shaped heat transfer plates use continuous convex and concave patterns that create turbulent flow while maintaining a relatively simple plate structure. The curvature is achieved through standardized wave patterns that can be manufactured using conventional techniques, balancing performance improvement with manufacturing feasibility.
Solution Approach 2:
The heat transfer plate is divided into multiple convex and concave sections along the flow direction. This segmentation creates multiple flow path variations that generate turbulent flow throughout the exchanger, improving overall heat exchange efficiency while maintaining modular manufacturability.
3Loss of energy
If turbulent flow is generated in the low-temperature refrigerant passage, then heat exchange efficiency improves, but the size of the heat exchanging unit increases
Solution Approach 1:
The wave-shaped plates generate turbulent flow within a compact footprint by creating flow path lengthening and mixing through three-dimensional wave patterns. This allows efficient heat exchange in a smaller volume compared to straight-channel designs that would require longer passage lengths to achieve the same turbulent flow effect.
Solution Approach 2:
The patent transitions from two-dimensional flat plate heat exchange to three-dimensional wave-shaped heat exchange. This adds a vertical dimension to the flow paths, increasing the effective heat transfer surface area and promoting turbulent flow within a compact horizontal footprint, thereby reducing overall unit size.
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 configuration improves heat exchange efficiency in the plate heat exchanger, facilitating turbulent flow and reducing the overall size of the heat exchanging unit while maintaining high performance.
Implementation Method 1
the low-temperature side refrigerant that enters low-temperature side compressor (21) enters main tube (22a), and the low-temperature side refrigerant flown out from low-temperature side compressor (21) enters spiral tube (22b) wound in a spiral form
Implementation Method 2
spiral tube (22b) wound in a spiral form where the low-temperature side refrigerant flown out from low-temperature side compressor (21) enters
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a binary refrigeration device equipped with: a low-temperature-side refrigeration circuit, which is provided with a helical heat exchanger having a main body pipe into which a low-temperature-side refrigerant, which flows into a low-temperature-side compressor, flows, and a helical pipe which is wound around the main body pipe in a helical shape, and into which the low-temperature-side refrigerant flowing from the low-temperature-side compressor flows; and a high-temperature-side refrigeration circuit for circulating a high-temperature-side refrigerant that exchanges heat with the low-temperature-side refrigerant exchanges heat via a plate-type heat exchanger.