An electrical heater
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Solution Overview
Problem
Conventional electrical fluid heaters suffer from inefficient heat exchange and reduced performance due to the formation of dead zones near the walls of the fluid flow chamber, particularly at the top and bottom faces, leading to non-uniform coolant distribution and insufficient contact with heating elements.
Innovation Solution
The electrical fluid heater incorporates a plurality of intermediate baffles arranged in a spaced configuration within the fluid flow chamber to redirect the fluid flow, creating a tortuous path and preventing the formation of dead zones by ensuring uniform distribution of the coolant around the heating elements, with features like slots and holes on the baffles to enhance fluid scavenging and heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the heater uses a conventional fluid flow chamber without intermediate baffles, then the structure is simple, but the coolant distribution is non-uniform and dead zones form near the walls
Solution Approach 1:
The fluid flow chamber is segmented by introducing a plurality of intermediate baffles that divide the chamber into multiple sections. These baffles create separate flow paths for the coolant, preventing direct flow from inlet to outlet and ensuring uniform distribution across the heating elements. The segmentation approach transforms the single-chamber design into a multi-section system that eliminates dead zones near walls while maintaining manageable structural complexity.
Solution Approach 2:
Intermediate baffles serve as intermediary structures between the coolant flow and the heating elements. These baffles redirect the coolant flow path, forcing the fluid to travel through a tortuous path that maximizes contact with heating elements while preventing short-circuiting. The baffles act as mediators that transform the direct inlet-to-outlet flow into a distributed flow pattern across the entire chamber.
2Productivity
If the coolant follows the shortest path from inlet to outlet, then the flow path is short, but heat exchange efficiency is reduced due to insufficient contact with heating elements
Solution Approach 1:
The intermediate baffles create a tortuous (curved) flow path for the coolant instead of allowing a straight-line path from inlet to outlet. The coolant is forced to navigate around and between the baffles, increasing the effective flow path length and contact time with heating elements. This curvature approach maximizes heat exchange efficiency by ensuring the coolant passes close to multiple heating elements throughout its journey.
Solution Approach 2:
The baffles are arranged to ensure continuous contact between the coolant and heating elements throughout the flow path. By preventing the coolant from bypassing heating elements and forcing it through a continuous tortuous path, the system maintains useful heat exchange action throughout the entire flow duration, eliminating dead zones where no heat exchange occurs.
3Loss of energy
If intermediate baffles are added to redirect fluid flow, then heat exchange efficiency improves, but the device complexity increases
Solution Approach 1:
The intermediate baffles are strategically positioned at specific locations within the fluid flow chamber where they are most needed to redirect flow and eliminate dead zones. Rather than uniformly distributing baffles throughout the chamber, the design places them at critical locations near walls and heating elements, optimizing thermal efficiency while minimizing the total number of baffles required.
Solution Approach 2:
The design optimizes parameters such as baffle spacing, baffle height, and baffle positioning to achieve the desired flow redistribution with a minimal number of components. By carefully selecting these geometric parameters, the system achieves effective coolant distribution and heat exchange efficiency without requiring an excessive number of intermediate baffles, thus balancing performance improvement with device complexity.
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 significantly improves the thermal efficiency and performance of the electrical fluid heater by ensuring homogeneous coolant distribution and extended contact with heating elements, preventing dead zones and enhancing heat extraction, while also allowing for accurate temperature measurements with micro sensors positioned at desired locations.
Implementation Method 1
The plurality of heating elements are heated by resistive heating to heat fluid flowing around thereof
Implementation Method 2
the heat exchange fluid, for example the coolant is required to be homogeneously distributed within the fluid flow chamber to enable sufficient contact between the heat exchange fluid and the heating elements for heat extraction therefrom
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An electrical fluid heater (100) includes a housing and electric heating elements (20). The housing forms a fluid flow chamber (10) formed with an inlet (12) for ingress and an outlet (14) for the egress of fluid. The heating elements (20) disposed inside the fluid flow chamber (10) are heated by resistive heating to heat fluid flowing around thereof as the fluid flows in the fluid flow chamber (10) from the inlet (12) to the outlet (14). The electric heating elements (20) are formed as heating bars extending through the fluid flow chamber (10) from one extremity to the other. The electrical fluid heater (100) includes intermediate baffles (30) arranged within the fluid flow chamber (10) to redirect fluid received inside the fluid flow chamber (10) to uniformly distribute fluid within the fluid flow chamber (10) and define a torturous fluid flow path between the inlet (12) and the outlet (14).