Heat Exchanger with Differentiated Pipeline Rows for Phase-Change Transfer
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Solution Overview
Problem
Existing double-row parallel-flow heat exchangers have inconsistent heat exchange performance due to identical pipeline structures in both rows, leading to insufficient heat exchange in the rear row when the medium transitions from liquid to gas, affecting overall efficiency.
Innovation Solution
The heat exchanger features two rows of pipelines with distinct structures, including interlaced first and second flat pipes with varying cross-sectional areas and orientations, along with a distributor and bending connectors to optimize heat exchange and flow dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If identical pipeline structures are used in both rows of the heat exchanger, then the structure is simple and easy to manufacture, but the heat exchange performance in the rear row becomes insufficient when the medium transitions from liquid to gas
Solution Approach 1:
The patent applies local quality by differentiating the pipeline structures between the front row and rear row. The front row uses first pipelines with a first structure optimized for liquid phase heat exchange, while the rear row uses second pipelines with a second structure optimized for gas phase heat exchange. This localized structural differentiation allows each row to be optimized for its specific function, resolving the contradiction between manufacturing simplicity and heat exchange performance.
Solution Approach 2:
The patent employs asymmetry by introducing asymmetric pipeline structures where the front row and rear row have different configurations. The first pipelines and second pipelines have different structural characteristics that match the varying heat exchange requirements along the flow direction, transforming the symmetric but inefficient design into an asymmetric design that optimizes performance across different operating conditions.
2Speed
If the medium flows through the pipelines at high speed during evaporation, then the evaporation process is efficient, but the heat exchange between the medium and the rear row pipeline becomes insufficient
Solution Approach 1:
The patent addresses this contradiction by implementing local quality through row-specific pipeline structures. The front row pipelines are designed to handle the high-speed flow efficiently, while the rear row pipelines have structures optimized for heat exchange with the evaporating medium. This localized optimization allows high flow rates to coexist with effective heat exchange in both rows.
Solution Approach 2:
The patent applies parameter changes by modifying the pipeline structural parameters (such as diameter, wall thickness, material properties) between the front row and rear row. These parameter variations enable the system to maintain optimal flow speeds while providing sufficient heat exchange surface area and contact time in the rear row, even as the medium transitions from liquid to gas.
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
This design enhances heat exchange performance by adjusting flow rates and contact areas, improving heat transfer efficiency and discharge capabilities while reducing the risk of leakage and material waste.
Implementation Method 1
The heat exchanger is configured to exchange heat between the air conditioning system and the outside world, and the heat exchange is mainly accomplished via fins of the heat exchanger
Implementation Method 2
when the heat exchanger is used as an evaporator, a medium is liquid when it enters the front row of the pipeline, and with the heat exchange process, the medium is gradually evaporated from liquid to gas
Data Source
AI summary
A heat exchanger (100) includes a plurality of fin units (10), a first pipeline unit (2), and a second pipeline unit (3); the plurality of fin units (10) is spaced apart from each other and arranged side by side; the first pipeline unit (2) penetrates through the fin units (10), and includes a plurality of first pipelines (201) distributed at intervals in the length direction of the fin units (10); the second pipeline unit (3) penetrates through the fin units (10); the second pipeline unit (3) and the first pipeline unit (2) are arranged at intervals in the width direction of the fin units (10); the second pipeline unit (3) includes a plurality of second pipelines (301) distributed at intervals in the length direction of the fin units (10); and the pipeline structures of the second pipelines (301) and the first pipelines (201) are different.