Evaporator Core Geometry for Heat Exchange and Flow Balance
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Solution Overview
Problem
Conventional evaporators face challenges in maximizing heat exchange efficiency due to limitations in the dimensional extent of the communicating hole, number of holes, fin height, and tube height, leading to temperature deviations and restricted airflow or refrigerant flow.
Innovation Solution
The evaporator design optimizes the surface area of the communicating hole, number of holes, fin height, and tube height to create a dimensional extent that maximizes heat radiation and minimizes temperature deviations, with specific dimensions such as a 20-35 mm core width, 70-130% communicating hole area relative to the compartment area, 4-7 mm fin height, and 2-3 mm tube height, ensuring smooth flow of refrigerant and air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the surface area of the communicating hole is increased, then the heat exchange efficiency is improved, but the temperature deviation on the evaporator surface increases
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional ratios: the communicating hole area is set at 70-130% of the compartment area, fin height at 4-7mm, and tube height at 2-3mm. These optimized parameters simultaneously improve heat exchange efficiency while controlling temperature deviation across the evaporator surface.
2Area of stationary object
If the fin height is increased, then the heat exchange surface area is increased, but the external air flow is restricted
Solution Approach 1:
The patent resolves this contradiction by optimizing the fin height parameter to 4-7mm. This specific range maximizes the heat exchange surface area while maintaining adequate gaps for external air flow, preventing airflow restriction that would occur with taller fins.
3Speed
If the tube height is increased, then the internal refrigerant flow is improved, but the heat exchange performance is deteriorated
Solution Approach 1:
The patent optimizes the tube height parameter to 2-3mm, which balances the internal refrigerant flow improvement with heat exchange performance. This specific height range allows smooth refrigerant flow while maintaining adequate external fin height for heat exchange, preventing the performance deterioration that would occur with taller tubes.
4Area of stationary object
If the core portion width is decreased, then the evaporator size is reduced, but the heat radiation amount is reduced
Solution Approach 1:
The patent optimizes the core portion width to 20-35mm, which is the optimal range that minimizes evaporator size while maintaining adequate heat radiation amount. This parameter optimization ensures compact dimensions without sacrificing heat exchange capability.
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 optimized design enhances heat exchange efficiency by maximizing heat radiation and reducing temperature deviations, allowing for improved airflow and refrigerant flow, thereby stabilizing air-conditioning performance.
Implementation Method 1
the refrigerant is flowed through the header tank and the tube, and while external air is flowed along the fin interposed between the tubes, the heat exchange is occurred between the refrigerant and the external air
Implementation Method 2
air introduced by an air blower is cooled due to heat exchange while liquid heat exchange medium is changed into a gaseous state
Implementation Method 3
liquid heat exchange medium is changed into a gaseous state
Implementation Method 4
liquid heat exchange medium is changed into a gaseous state
Data Source
AI summary
The present invention relates to an evaporator, and more particularly, to an evaporator which can restrict a surface area of a communication hole with respect to a cross sectional area of a compartment and a surface area of a tube with respect to a surface area of a fin, thereby providing a dimensional extent for maximizing the heat exchange efficiency. Therefore, by optimizing a relation between the surface area of the communication portion and the surface area of the compartment of the first header tank and dimensions for each surface area and the heights of the tube and fin, the present invention provides a dimensional extent for maximizing the heat radiation amount, reducing the maximum temperature deviation of the core portion and allowing the refrigerant and air to be smoothly flowed, thereby maximizing the heat exchange efficiency.