Finned Coiled Heat Exchanger for Better Gas-to-Duct Contact
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Solution Overview
Problem
Conventional heat exchangers suffer from inefficient heat exchange due to burned gases not fully striking coiled ducts, especially when multiple ducts are intertwined, leading to suboptimal thermal efficiency.
Innovation Solution
A heat exchanger design featuring a coiled duct with radially extending fins along its outer surface, guiding burned gases to strike the duct's surface more effectively, and internal division into parallel channels to accommodate multiple fluids, enhancing heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple coiled ducts are used in the heat exchanger, then the heat exchange capacity is increased, but the fluidodynamic limits prevent burned gases from completely striking the ducts, reducing heat exchange efficiency
Solution Approach 1:
The invention introduces a radial dimension to the duct configuration by arranging ducts at different radial distances from the combustion chamber. This multi-dimensional arrangement allows burned gases to effectively strike multiple ducts simultaneously, overcoming the fluidodynamic limits that constrain single-plane multi-duct configurations.
Solution Approach 2:
Different ducts are positioned at different radial locations with optimized characteristics for their specific positions. Outer ducts and inner ducts can have different geometries and thermal properties tailored to their local heat exchange requirements, maximizing overall efficiency while maintaining complete gas-duct contact.
2Area of stationary object
If coiled ducts are intertwined and intercalated to increase heat exchange surface, then the heat exchange area is increased, but evident heat exchange limits occur between outer and inner ducts
Solution Approach 1:
The invention transitions from a two-dimensional planar arrangement of intertwined ducts to a three-dimensional radial configuration. Ducts are arranged concentrically at different radial distances from the combustion chamber, allowing burned gases to flow radially outward and contact multiple ducts in sequence, eliminating the heat exchange limits that plague planar intertwined configurations.
Solution Approach 2:
The heat exchange system is segmented into multiple independent ducts positioned at different radial levels. Each duct operates semi-independently with optimized surface area and geometry for its specific radial position, allowing the system to achieve high total heat exchange capacity without the interference and fluidodynamic limits that occur when ducts are tightly intertwined.
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 design significantly improves thermal efficiency by ensuring complete contact between burned gases and the coiled duct, optimizing heat transfer and allowing simultaneous heating of multiple fluids, while being structurally simple, cost-effective, and easy to assemble.
Implementation Method 1
the burned gases 7 produced by the combustion of the combustible mixture 5 are sent forcibly onto the coiled duct 3 thus striking its outer surface in order to heat the fluid to be heated 6
Implementation Method 2
the burned gases 7 produced by the combustion of the combustible mixture 5 are sent forcibly onto the coiled duct 3 thus striking its outer surface
Implementation Method 3
a plurality of fins 30 is provided which are defined on the outer surface of the coiled duct 3... with consequent increasing of the heat exchange between the hot fluid 7 and the fluid to be heated 6
Implementation Method 4
a combustion chamber 4 for the combustion of a combustible mixture 5... the burned gases 7 produced by the combustion of the combustible mixture 5
Data Source
Figure 1
Figure 2~3
Figure 4~7
AI summary
A heat exchanger (1) with improved thermal efficiency comprising a container body (2) crossed by a forced flow of hot fluid (7) and at least one coiled duct (3) crossed internally by at least one fluid to be heated (6), the coiled duct (3) being accommodated inside the container body (2) and being struck by the hot fluid (7) in order to heat the fluid to be heated (6), the heat exchanger comprising a plurality of fms (30) which are formed on the outer surface of the coiled duct (3) and which run substantially along the entire longitudinal length of the coiled duct (3) in order to guide the hot fluid (7) along the coiled duct (3) so as to increase the heat exchange between the hot fluid (7) and the fluid to be heated (6).