Heat Exchanger for Crystallization Systems with Adjustable Insulation
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Solution Overview
Problem
Existing heat exchangers for directional solidification processes face challenges in controlling low heat flux values and maintaining thermal insulation, leading to non-negligible thermal fluxes and reduced regulation capacity, especially in high-temperature applications like photovoltaic silicon ingot production.
Innovation Solution
A heat exchanger design featuring adjustable parts with thermally insulating materials and modifiable baffles to control heat flux by varying the view factor between the hot and cold sources, allowing for precise modulation of thermal radiation and reducing heat flow when parts are close, while increasing it when they are far apart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical clearance is provided between the first and second parts to allow proper interpenetration and avoid contact, then thermal radiation is reduced when separated, but significant heat flux occurs through the clearance when separated, reducing insulating capacity
Solution Approach 1:
A third part made of thermally insulating material is introduced as an intermediary between the first and second parts. This intermediary fills the mechanical clearance when the first and second parts are separated, preventing direct thermal radiation paths and blocking heat flux through the clearance, thereby maintaining insulating capacity without requiring the first and second parts to be in direct contact
Solution Approach 2:
The heat exchanger is divided into three separate parts (first part, second part, and third part) instead of two parts. The third part acts as a separate insulating element that can be positioned between the first and second parts, allowing independent optimization of each component's function - the first and second parts for thermal exchange control and the third part for insulation
2Loss of energy
If the first and second parts are separated to minimize heat flux and maximize insulating capacity, then thermal radiation is reduced, but heat flux control precision is lost at low heat flux values
Solution Approach 1:
The heat exchanger design allows dynamic adjustment of the relative positions of the first and second parts along with the third part. By dynamically adjusting the spacing between these parts, the system can modulate the view factor and control heat flux precisely across a wide range, including low heat flux values, while maintaining the ability to achieve minimum heat flux when fully separated
Solution Approach 2:
The system controls heat flux by changing geometric parameters - specifically the distances between the first, second, and third parts. By varying these spatial parameters, the view factor between the hot and cold sources is modulated, enabling precise control of radiative heat transfer and allowing the system to achieve both minimum and low heat flux values with appropriate precision
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 enables improved control of heat flux, enhanced thermal insulation, and homogeneity of heat flow, reducing thermomechanical stresses and maintenance costs by allowing for precise adjustment of heat flux values and decoupling from heating or cooling sources.
Implementation Method 1
the radiative heat exchange is maximized. Conversely, when the first and second parts are separated, and the surface areas facing the conductive faces are minimized, the radiative heat exchange is minimized
Implementation Method 2
The first and second parts are movable relative to each other, and both have raised features designed to cooperate with one another. When the raised features are nested together, the surface areas facing the conductive faces are maximized
Data Source
Figure 1A~1C
Figure 2~3
Figure 4A~4C
AI summary
A heat exchanger for a solidification and/or crystallization system, comprising a first part (8) and a second part (9), means (12) for moving the first (8) and second (9) parts relative to one another, the first part (8) comprising first elements (10) mounted at a distance from one another, each first element (10) comprising an end face in contact with the first support as well as a second end face (10.2), the second part comprising second elements (12) mounted at a distance from one another on a second support, each second element (12) comprising, along the first direction, an end face in contact with the second support as well as a second end face (12.1). The first elements (10) and the second elements (12) are made of a thermally insulating material, and the second end face (10.1) of each first element (10) faces two second end faces (12.1) of the second elements (12).