Heat Exchanger With Staggered Flow Inlets For Refrigerant Distribution
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Solution Overview
Problem
In refrigeration systems, the gas-liquid two-phase refrigerant distribution is uneven in heat exchange tubes, leading to premature evaporation in some channels and insufficient superheat in others, resulting in inefficient heat exchange and potential compressor damage.
Innovation Solution
A heat exchanger design featuring heat exchange tubes with a height difference between their flow inlets, optimizing refrigerant distribution by allowing timely discharge of gaseous refrigerant and ensuring even liquid distribution, thereby preventing cavitation and improving heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas-liquid two-phase refrigerant is introduced into heat exchange tubes, then heat exchange function is achieved, but uneven distribution of refrigerant occurs leading to premature evaporation in some channels and insufficient superheat in others
Solution Approach 1:
The heat exchange tube is segmented into multiple independent flow channels, each with its own flow inlet positioned at different heights. This segmentation allows the gas-liquid two-phase refrigerant to be distributed more evenly across channels, with each channel receiving appropriate refrigerant flow based on its specific inlet position, thereby preventing premature evaporation in some channels and insufficient superheat in others.
Solution Approach 2:
Different flow inlets are positioned at different heights along the heat exchange tube, creating local quality variations. The first flow inlet is positioned at a first height and the second flow inlet at a second height, allowing each channel to have optimized local characteristics for refrigerant distribution. This local differentiation ensures that each channel receives the appropriate amount of liquid refrigerant for effective heat exchange without premature evaporation or insufficient superheat.
2Area of stationary object
If multiple flow channels are used to increase heat exchange area, then heat exchange efficiency improves, but uneven refrigerant distribution occurs causing some channels to evaporate prematurely
Solution Approach 1:
The flow inlets are positioned asymmetrically at different heights along the heat exchange tube rather than at the same level. This asymmetric arrangement ensures that each flow channel receives refrigerant at optimized positions, preventing premature evaporation in channels that would otherwise receive excessive liquid flow while maintaining adequate refrigerant supply to all channels for full heat exchange area utilization.
3Productivity
If liquid refrigerant distribution is uneven, then heat exchange area is not fully utilized, but increasing liquid flow to some channels causes premature evaporation
Solution Approach 1:
The solution moves from a single-level refrigerant distribution approach to a multi-height dimensional distribution system. By positioning flow inlets at different heights (first height and second height) along the heat exchange tube, the system creates a vertical dimension for refrigerant distribution. This dimensional change allows precise control of liquid refrigerant flow to each channel, ensuring full heat exchange area utilization without premature evaporation caused by excessive liquid flow in any single channel.
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 design enhances refrigerant distribution and heat exchange efficiency, preventing liquid hammer phenomena and optimizing the heat exchange area, leading to improved performance and reduced risk of compressor damage.
Implementation Method 1
The gas-liquid separation of the gas-liquid two-phase refrigerant will lead to uneven distribution of the refrigerant entering the heat exchange tube
Implementation Method 2
There is a height difference between the flow inlet of the first heat exchange tube and the flow inlet of the second heat exchange tube in a height direction of the heat exchanger
Data Source
AI summary
A heat exchanger includes a heat exchange tube, a first tube, a second tube and an inlet tube. The first and second tubes extend along a length direction of the heat exchanger, and the inlet tube is connected with the first tube. The heat exchange tube is connected with the first and second tubes, and has a plurality of flow channels communicated with the first and second tubes. The heat exchange tube includes a first heat exchange tube and a second heat exchange tube, and a flow inlet of the first heat exchange tube and a flow inlet of the second heat exchange tube are both arranged in a tube cavity of the first tube. There is a height difference between the flow inlet of the first heat exchange tube and the flow inlet of the second heat exchange tube in a height direction of the heat exchanger.