Multi-Ring Heat Exchanger Layout for Compact High-Efficiency Heating
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Solution Overview
Problem
Existing commercial water heaters face challenges in achieving efficient heat transfer due to the limitations of fixed tube designs, which restrict expansion and contraction, and often operate below optimal efficiency to prevent acidic condensate formation, leading to suboptimal performance and environmental concerns.
Innovation Solution
A radially-fired heat exchanger with multiple rings of tubes, where the first and second tubes are spaced differently from the radial heat source, and enhancement devices create a water vortex to prevent boiling, allowing for efficient heat transfer and compact configuration, while baffles manage flow to achieve four-pass heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fixed length copper-finned tubes are used to surround the burner, then heat transfer efficiency is enhanced, but the system cannot accommodate thermal expansion or contraction
Solution Approach 1:
The patent replaces fixed rigid tube supports with flexible corrugated metal bellows that can dynamically expand and contract to accommodate thermal changes. The bellows are attached to the tube sheets and provide controlled flexibility, allowing the heat exchanger to adapt to thermal expansion while maintaining structural integrity and heat transfer efficiency.
2Use of energy by moving object
If longer tubing is used to allow effective heat exchange, then heat transfer improves, but the device size and material usage increase
Solution Approach 1:
The patent employs multiple nested rings of tubes arranged concentrically around the burner, with inner rings closer to the heat source and outer rings further away. This nested configuration maximizes heat transfer surface area within a compact volume, allowing effective heat exchange without proportionally increasing the overall device size.
Solution Approach 2:
The patent transitions from a single-plane tube arrangement to a three-dimensional multi-ring configuration. By distributing tubes across multiple concentric rings at different radial distances from the burner, the system achieves enhanced heat transfer surface area within a compact footprint, effectively utilizing spatial dimensions to optimize heat exchange without linearly increasing device volume.
3Use of energy by moving object
If the heat exchanger operates at high efficiency, then more heat is transferred, but acidic condensate forms requiring special handling
Solution Approach 1:
The patent incorporates condensation management features that convert the harmful acidic condensate into a manageable byproduct. The design includes drainage provisions and material selections that tolerate condensation, allowing the system to operate at high efficiencies where condensation occurs, while the condensate is safely routed out through designated drainage paths rather than causing corrosion or damage.
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 enhances heat transfer efficiency, reduces material usage, and achieves higher thermal efficiency with a more compact size, preventing boiling and allowing for better handling of acidic condensate, while meeting environmental standards.
Implementation Method 1
radial-fired heat exchanger with multiple rings of tubes... radially-directed, cylindrical burner... heat transfer from the combustion products to the circulated water
Implementation Method 2
exhaust gases that exit the primary heat exchanger... are routed to a secondary heat exchanger where they are passed countercurrent to ambient makeup water... preheat the water
Implementation Method 3
enhancement devices create a water vortex in the tubes wherein a high velocity water stream which flows through the tubes is in contact alternately with a hot side and then a cooler side of the tubes, wherein boiling of the water in the tubes is prevented
Data Source
AI summary
The heat exchanger with a radial heat source has a first header, a second header, first tubes and second tubes. The first header is configured to allow liquid to enter and exit the heat exchanger. The second header is spaced from the first header and has at least one lower baffle provided therein. The first tubes extend from the first header to the second header, with the first tubes being spaced proximate to the radial heat source. The second tubes extend from the first header to the second header, with the second tubes being spaced from the radial heat source a greater distance than the first tubes. An enhancement device may be positioned in respective tubes of the first tubes to create a water vortex in the first tubes wherein boiling of the water in the first tubes is prevented.