Thermal Bead Bath Air Recirculation for Rapid Uniform Heating
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Solution Overview
Problem
Thermal bead baths face inefficiencies in heating biological samples due to slow warm-up times, poor thermal uniformity, and temperature discrepancies caused by the reliance on thermal conductivity, leading to inefficient heat transfer and hotspot formation.
Innovation Solution
A recirculating thermal air supply system that heats the bulk bead volume, reducing the need for thermal conductivity between beads and providing improved warm-up speed, thermal uniformity, and energy efficiency by circulating heated air through a closed system with insulated shells, air injection and extraction ports, and a fan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If thermal conductivity-based heating is used in traditional bead baths, then heat transfer occurs through bead conduction, but warm-up time is slow and thermal uniformity is poor
Solution Approach 1:
The patent replaces the thermal conduction mechanism (mechanical/physical contact-based heat transfer) with a fluid convection system. A fan circulates air through the bead bath, and heating elements heat the air which then convects throughout the bath, eliminating reliance on slow bead-to-bead thermal conduction and achieving rapid, uniform heating.
Solution Approach 2:
The patent introduces a pneumatic system using air circulation. A fan drives air flow through the bead bath, and heated air acts as the heat transfer medium. This pneumatic approach enables rapid heat distribution throughout the bath, solving both the slow warm-up and thermal uniformity problems of conduction-based systems.
2Device complexity
If heating is supplied only from the perimeter of the bath, then the heating source is simple to implement, but temperature gradients and hotspots are created
Solution Approach 1:
The patent segments the heating function across multiple locations. Instead of a single perimeter heating source, multiple heating elements are distributed throughout the bath, and the air circulation system distributes heat from multiple zones, eliminating temperature gradients and hotspots while maintaining reasonable system complexity.
Solution Approach 2:
The patent transitions from two-dimensional perimeter heating (heating elements on the edges of the bath) to three-dimensional volumetric heating (heating elements distributed throughout the bath volume, with air circulation distributing heat in all directions). This dimensional change eliminates temperature gradients while adding only moderate complexity.
3Ease of manufacture
If aluminum beads are used for thermal conduction, then the bead bath structure is simple, but heat transfer efficiency is poor and hotspots form
Solution Approach 1:
The patent replaces reliance on aluminum bead thermal conduction with an air convection system. The beads become passive thermal mass rather than active heat transfer conduits. Heating elements heat the air, and fan-driven air circulation distributes heat efficiently throughout the bath, dramatically improving heating efficiency while maintaining simple bead bath construction.
Solution Approach 2:
The patent introduces air as an intermediary heat transfer medium. Instead of heat transferring directly through aluminum beads (which creates hotspots and is inefficient), air circulates as an intermediary, absorbing heat from distributed heating elements and distributing it uniformly throughout the bead bath, improving efficiency without complicating the basic bead structure.
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 system achieves faster temperature control, reduced temperature gradients, and quicker sample thawing with improved thermal recovery and uniformity, making it more energy-efficient and effective than traditional thermal bead baths.
Implementation Method 1
a fan aerodynamically positioned to draw air out of the air extraction port
Implementation Method 2
at least one thermal element
Implementation Method 3
a layer of insulation between the outer surface and the inner air shield
Data Source
AI summary
A system for precision temperature control of thermal bead baths used in biological laboratories to heat biological samples. An insulated outer shell and an inner shell sealed together to form a recirculation pathway. The inner shell has an air extraction port opening into the recirculation pathway and at least one air injection port opening into the recirculation pathway. A fan in the recirculation pathway draws air through the air extraction port. A thermal sensor is connected to a control and is disposed in close proximity to one of the air injection ports. Thermal beads are placed in a mesh basket inside the inner shell. The fan draws air from the inner shell through the beads and into the recirculation pathway, where the air is heated by a thermal element. The air flows past the thermal element and through the air injection ports back into the inner shell.