Louvered Pallet Rack Panels for Variable-Height Blast Freezing
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Solution Overview
Problem
Conventional blast freezing systems face inefficiencies due to airflow resistance and temperature differential issues, leading to longer freezing times and increased energy consumption, particularly because existing systems require manual adjustment of airflow panels for varying pallet heights and sizes.
Innovation Solution
The implementation of automatically adjustable airflow panels with pivoting louvers that open based on pallet height, directing airflow through the palletized goods rather than around them, combined with flexible side seals to enhance airflow and reduce turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual adjustment of airflow panels is used for varying pallet heights, then airflow can be directed through palletized goods, but labor intensity and operational complexity increase substantially
Solution Approach 1:
The louvered doors are designed to automatically adjust their opening height based on the presence and height of palletized goods in the rack positions. The system self-regulates airflow distribution without requiring manual intervention, eliminating the labor-intensive panel adjustment problem while maintaining optimized freezing rates
Solution Approach 2:
The louvered doors provide dynamic, variable airflow openings that automatically adapt to different pallet heights and rack configurations. This dynamic adjustment capability replaces static manual panel settings, enabling the system to respond automatically to changing operational conditions while maintaining optimal freezing performance
2Productivity
If airflow follows paths around and between palletized products, then air flow resistance is reduced, but freezing efficiency decreases due to less contact with food
Solution Approach 1:
The louvered doors create localized high-velocity airflow zones directly at the palletized goods by directing air through vertically adjustable openings. This concentrates cooling energy where it is most needed (on the food surface) rather than allowing diffuse flow around products, improving freezing efficiency without excessive energy loss
Solution Approach 2:
The airflow system is segmented into multiple independent louvered door sections, each controlling airflow to specific rack positions. This segmentation allows precise direction of air flow through individual palletized products, ensuring efficient heat transfer while managing overall air flow resistance through distributed openings
3Stability of the object's composition
If consecutive pallets are cooled by sequential air flow, then cooling progresses through the stack, but temperature uniformity decreases between entrance and exit sides
Solution Approach 1:
The rack system is divided into multiple independently controlled louvered door sections, each creating its own airflow zone. This segmentation allows air to be distributed more evenly across multiple pallet positions simultaneously, reducing the sequential cooling effect and improving temperature uniformity across the pallet stack while maintaining efficient freezing rates
4Extent of automation
If louvered doors are used for automatic airflow adjustment, then manual labor is eliminated and rack capacity flexibility increases, but system complexity increases
Solution Approach 1:
The louvered door mechanism is designed to be self-actuating, using the physical presence of palletized goods to automatically control the opening height. This passive automation approach achieves intelligent airflow management without complex sensors, motors, or control systems, balancing automation benefits with acceptable mechanical simplicity
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 solution increases the rate of temperature adjustment for palletized goods, reduces energy consumption, and eliminates the need for manual labor in adjusting airflow panels, allowing for efficient operation at any rack capacity while preventing unnecessary cooling of empty spaces.
Implementation Method 1
airflow panels with pivoting louvers that open based on pallet height, directing airflow through the palletized goods
Implementation Method 2
flexible side seals to enhance airflow and reduce turbulence
Implementation Method 3
Blast freezing is a known process for quickly exposing food products to air chilled to very low temperatures
Data Source
AI summary
Pallet racking systems are designed to quickly freeze items using thermal transfer by moving air through palletized products. Air is pulled through the palletized product to a negative air plenum behind the pallet rack. Back panels of the pallet racks provide variable-height airflow by use of louvers which are individually pressed open by the palletized product to accommodate differing product heights. The panels allow more efficient system operation with any number of rack positions filled.