Supercooling freezer box
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Solution Overview
Problem
Conventional supercooling refrigerators face issues with frequent compressor operation, uneven cool air distribution, and excessive cool air escape when the door is opened, leading to inefficient energy use and reduced compressor lifespan.
Innovation Solution
The design incorporates a cross-flow fan with multiple discs and blades, a cool air flow rate adjusting unit, and a cool air discharge mesh to ensure uniform low-speed air distribution, along with a cold insulator in the shelves and a hot-gas defrosting method to reduce compressor frequency and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional rotary fan is used to circulate cool air, then the cooling function is provided, but the cool air distribution becomes uneven and temperature uniformity deteriorates
Solution Approach 1:
The fan blade is divided into multiple segments along the rotation direction, with each segment having a different angle of attack. This segmentation allows different portions of the fan blade to push air in slightly different directions, creating a more uniform three-dimensional air distribution pattern rather than a concentrated directional flow, thereby improving temperature uniformity in the cooling chamber.
Solution Approach 2:
Different segments of the fan blade are designed with locally optimized angles of attack, where the angle varies along the rotation direction. This local quality variation ensures that each portion of the blade contributes optimally to air circulation in its specific zone, resulting in more uniform cool air distribution throughout the chamber.
2Reliability
If the compressor operates frequently to maintain supercooling, then the temperature control is maintained, but energy consumption increases and compressor lifespan decreases
Solution Approach 1:
The fan continues to circulate cool air even when the compressor is stopped, maintaining the temperature distribution and supercooling state in the chamber. This preliminary action of continuous air circulation prevents temperature stratification and hot spots, allowing the compressor to remain off longer and reducing its operational frequency, thereby extending lifespan and reducing energy consumption.
3Productivity
If high-speed cool air is discharged into the chamber, then cooling efficiency is improved, but cool air escape during door opening increases
Solution Approach 1:
The fan blade angle is dynamically optimized to balance air circulation speed and flow distribution. By adjusting the angle of attack parameters, the system achieves sufficient air movement for effective cooling while avoiding excessive air velocity that would cause rapid cool air loss during door opening. The dynamic balance between circulation intensity and air retention is achieved through the specific angle range of 10-30 degrees.
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 configuration reduces compressor operation frequency, minimizes cool air escape, and enhances temperature uniformity within the refrigerator, leading to improved energy efficiency and extended compressor life.
Implementation Method 1
a cross flow fan with multiple discs and blades... to ensure uniform low-speed air distribution
Implementation Method 2
an evaporator for cooling the air discharged from the fan
Implementation Method 3
a cool air discharge mesh to ensure uniform low-speed air distribution... reduces cool air escape
Implementation Method 4
a cold insulator in the shelves... enhances temperature uniformity within the refrigerator
Implementation Method 5
a hot-gas defrosting method to reduce compressor frequency and energy consumption
Implementation Method 6
reduces compressor operation frequency... leading to improved energy efficiency
Data Source
AI summary
A supercooling refrigerator (1000) including: a refrigerator body (100); a door (200) for opening and closing one side of the refrigerator body (100); an accommodating portion (400) provided inside the refrigerator body (100) and seated with an object (M) to be stored; a cooling duct (600) including a fan for taking in air in the refrigerator body (100) and discharging the air, and an evaporator (630) for cooling the air discharged from the fan; and a cool air supply duct (700) formed with a cool air discharge port (710) through which the air cooled through the cooling duct (600) is discharged into the refrigerator body (100), the fan being a cross flow fan (620) including a plurality of discs (622), and a plurality of blades (623) disposed between the discs (622) along outer circumferential surfaces of the discs (622).