Parallel Heat Exchanger Layout for Compact High-Output Water Heating
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Solution Overview
Problem
Hydronic boilers face challenges in achieving high thermal output while maintaining a small footprint and operating over a broad modulation range, often resulting in large pressure vessels and inefficient heat transfer due to the size and configuration of heat exchange systems.
Innovation Solution
A water heating apparatus with multiple parallel heat exchangers and a burner assembly that utilizes counterflow heat transfer and spiral grooves on heat exchange tubes, along with a compact piping arrangement for equal flow and pressure distribution, allowing for efficient heat transfer and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single large heat exchange system is used to achieve high thermal output, then the thermal capacity is sufficient, but the pressure vessel size becomes large and the footprint increases
Solution Approach 1:
The patent divides the heat exchange system into multiple parallel heat exchangers (first heat exchanger, second heat exchanger, etc.) instead of using a single large heat exchange system. Each heat exchanger has its own heat exchange tubes and can operate independently, allowing the system to achieve high thermal output through combined capacity while maintaining a compact overall pressure vessel size.
2Loss of energy
If conventional heat exchange tube configuration is used, then the structure is simple, but heat transfer efficiency is insufficient and turbulence is inadequate
Solution Approach 1:
The patent incorporates spiral grooves on the heat exchange tubes instead of conventional smooth or finned tubes. These spiral grooves create turbulence in the fluid flow, enhancing heat transfer efficiency by disrupting boundary layers and increasing mixing, while maintaining a relatively simple tube structure that can be manufactured using standard techniques.
3Power
If multiple heat exchangers are used to increase thermal capacity, then the thermal output increases, but the system complexity and piping arrangement becomes complicated
Solution Approach 1:
The patent combines multiple heat exchangers into a single integrated pressure vessel structure with unified water inlet and outlet connections. The heat exchangers share common water distribution manifolds and are arranged to utilize combustion chamber space efficiently, simplifying the piping arrangement while maintaining high thermal capacity through parallel operation.
Solution Approach 2:
The patent arranges heat exchangers in different spatial orientations and positions within the pressure vessel, utilizing vertical and horizontal spaces around the combustion chamber. This three-dimensional arrangement allows multiple heat exchangers to be integrated compactly without requiring complex horizontal piping extensions.
4Loss of energy
If heat exchangers are arranged to maximize heat transfer surface area, then thermal efficiency improves, but the footprint and occupied space increases
Solution Approach 1:
The patent positions heat exchangers within and around the combustion chamber space, nesting them in available volumes that would otherwise be unused. The heat exchange tubes are arranged to follow the contours of the combustion chamber, maximizing heat transfer surface area within the existing footprint rather than requiring additional horizontal or vertical space.
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 solution achieves high thermal efficiency (over 90% efficiency) and a compact form factor, enabling the system to operate effectively across a broad range of thermal demands without the need for complex control systems or large pressure vessels, while reducing noise and maintaining optimal heat transfer.
Implementation Method 1
a heat exchange element positioned within the outer housing and configured to heat a flow of liquid passing through the outer housing from the inlet to the outlet
Implementation Method 2
utilizes counterflow heat transfer
Implementation Method 3
The burner assembly includes a combustion chamber housing and a burner positioned internally within the combustion chamber housing. The burner assembly is coupled to the plurality of heat exchangers for supplying heat to the flow of liquid
Data Source
AI summary
A water heating apparatus includes a fluid inlet conduit configured to split into a plurality of supply legs, and a plurality of heat exchangers configured for parallel operation. Each heat exchanger includes an outer housing, an inlet connected to a respective supply leg of the fluid inlet conduit for receiving an inlet flow of liquid into the outer housing, an outlet for allowing an outlet flow of liquid to leave the outer housing, and a heat exchange element positioned within the outer housing and configured to heat a flow of liquid passing through the outer housing from the inlet to the outlet. The water heating apparatus further includes a burner assembly comprising a combustion chamber housing and a burner positioned internally within the combustion chamber housing. The burner assembly is coupled to the plurality of heat exchangers for supplying heat to the flow of liquid.