Conical Damper Heat Exchanger for Low Back-Pressure Flow Split
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Solution Overview
Problem
Existing heat exchangers face issues with increased back-pressure and turbulence due to damper systems, leading to efficiency drops and potential damage, and require compact designs that minimize space usage.
Innovation Solution
A conical damper design with rotatable paddles is used to apportion hot gas flow between a heat exchange duct and a bypass duct, minimizing turbulence and back-pressure while allowing for compact construction and improved flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a damper system is used to apportion hot gas between heat exchange duct and bypass duct, then the amount of heat delivered to the heat exchanger can be regulated, but the back-pressure at the gas inlet increases
Solution Approach 1:
The patent applies a conical (curved) surface for the damper instead of a flat planar surface. The conical shape with its curved geometry allows gas to flow smoothly over the surface, reducing turbulence and back-pressure while maintaining the ability to regulate heat delivery by apportioning gas between the heat exchange duct and bypass duct.
2Adaptability or versatility
If a damper system is used to apportion hot gas, then heat delivery can be controlled, but turbulence in the gas flow increases
Solution Approach 1:
The conical damper surface provides a curved flow path that guides gas smoothly from the inlet through either the heat exchange duct or bypass duct. This curved geometry eliminates sharp edges and abrupt directional changes that would create turbulence, while still enabling effective heat delivery control through the apportioning mechanism.
3Productivity
If the back-pressure from the damper is reduced, then engine efficiency is maintained, but the heat exchanger must be larger and heavier to create sufficient back-pressure
Solution Approach 1:
The conical damper design reduces back-pressure to acceptable levels by creating smooth gas flow paths, which maintains engine efficiency. The curved surface area of the cone is optimized to provide adequate flow resistance for the damper function while minimizing overall back-pressure, allowing the heat exchanger to be sized appropriately without requiring excessive weight or size.
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 conical damper design reduces turbulence and back-pressure, enhances flow distribution, and supports the weight of the heat exchanger, resulting in improved efficiency and reduced space requirements.
Implementation Method 1
a heat exchange duct having a heat exchanger for recovering heat from the hot gas
Implementation Method 2
Since the damper is in the shape of a cone, the airflow approaching the damper flows smoothly over the surface of the cone whilst creating minimum turbulence
Data Source
AI summary
There is provided a heat exchange unit (1) for recovering heat energy from a hot gas, the heat exchange unit comprising an inlet duct (11) for receiving the hot gas, a heat exchange duct (22) having a heat exchanger (25) for recovering heat from the hot gas, and a bypass duct (24) which bypasses the heat exchange duct and the heat exchanger, wherein the heat exchange unit further comprises a damper (30) configured to apportion the hot gas from the inlet duct (11) between flowing through the heat exchange duct (22) and flowing through the bypass duct (24), wherein the damper (30) is in the shape of a cone, or comprises rotatable shafts with paddles having two sides that converge towards one another to define a taper in the paddle, the taper directed radially away from the shaft.