Condensing Boiler Heat Exchanger with Dual-Pipe Water Preheating
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Solution Overview
Problem
Conventional condensing boilers have a complex structure due to the use of separate indirect heat exchangers and single pipe heat exchangers, which limits the ability to utilize a double pipe heat exchanger for heating and hot water supply.
Innovation Solution
A condensing boiler heat exchanger design that integrates a latent heat exchanger with a double pipe sensible heat exchanger, where the latent heat exchanger preheats cold water using latent heat from exhaust gas, eliminating the need for a separate indirect heat exchanger and simplifying the structure by using a double pipe configuration with multiple inlets and outlets for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate indirect heat exchanger is used to heat cold water, then hot water supply function is achieved, but the boiler structure becomes complicated and volume increases
Solution Approach 1:
The patent combines the indirect heat exchanger functionality with the existing sensible and latent heat exchangers by integrating cold water heating into the dual-pipe heat exchanger system. The dual-pipe heat exchanger now serves both heating water circulation and cold water heating functions, eliminating the need for a separate indirect heat exchanger and reducing structural complexity.
Solution Approach 2:
The dual-pipe heat exchanger is designed to perform multiple functions: it serves as both the sensible heat exchanger for heating water circulation and the indirect heat exchanger for cold water heating. This multi-functionality allows the system to maintain hot water supply capability while reducing the number of separate components.
2Ease of manufacture
If a single pipe heat exchanger is used, then manufacturing is simpler, but the ability to supply both heating water and hot water efficiently is limited
Solution Approach 1:
The patent employs a nested dual-pipe configuration where one pipe is positioned inside another, creating concentric flow paths for heating water and cold water. This nesting arrangement increases the heat transfer surface area and improves thermal efficiency while maintaining a compact structure that is still relatively simple to manufacture.
3Device complexity
If a double pipe heat exchanger is used as sensible heat exchanger, then structure is simplified and volume reduced, but conventional single pipe configuration cannot be used
Solution Approach 1:
The patent implements a dynamic flow distribution system within the dual-pipe heat exchanger that can adapt to different operating conditions. The system can switch between heating-only mode and combined heating-plus-hot-water-supply mode by controlling the flow paths, providing versatility while maintaining the simplified dual-pipe structure.
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 results in a simpler, more compact boiler structure with enhanced heat efficiency, allowing the double pipe heat exchanger to effectively preheat both heating and hot water, reducing volume and complexity.
Implementation Method 1
The condensing boilers recover latent heat of water vapor involved in exhaust gas and are provided with a separate heat exchanger (latent heat exchanger) to recover latent heat
Implementation Method 2
a latent heat exchanger including a heating water heat exchanger and a hot water heat exchanger for preheating the heating water and the cold water, respectively
Implementation Method 3
a sensible heat exchanger; and a latent heat exchanger including a heating water heat exchanger and a hot water heat exchanger for preheating the heating water and the cold water, respectively, which exchange heat with water to be supplied to the heating pipe arrangement and water to be supplied to the cold water pipe arrangement, respectively
Implementation Method 4
As the latent heat exchanger makes contact with relatively low temperature of the exhaust gas, condensed water is generated
Data Source
AI summary
Disclosed is a heat exchanger for a condensing boiler supplying both heating water and hot water, which can use a double pipe as a sensible heat exchanger, instead of the use of an indirect heat exchanger. The heat exchanger includes: a sensible heat exchanger; and a latent heat exchanger made by connecting a plurality of unit heat exchangers to define exhaust gas pathway, each unit heat exchanger being manufactured in such a manner that three plates having a convexo-concave shape are stacked on one another to define a heating water pathway and a hot water pathway to be adjacent to each other in order to increase a heat transfer area.