Parallel Heat Exchanger Boiler Layout for High Output in Small Footprints
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Solution Overview
Problem
Conventional hydronic boilers require large pressure vessels due to high operating water pressure, leading to a significant footprint and inefficiencies in heat transfer and modulation, especially in industrial applications.
Innovation Solution
A compact water heating apparatus with a fire tube design featuring multiple heat exchangers, counterflow heat transfer, and a unique piping arrangement, utilizing expansion joints and spiral grooves on heat exchange tubes for efficient heat transfer and modulation, along with a controller for temperature regulation and safety monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional hydronic boilers use large pressure vessels to handle high operating water pressure, then the system can maintain required pressure levels, but the footprint becomes excessively large
Solution Approach 1:
The patent divides the heat exchange system into multiple independent heat exchangers (first heat exchanger, second heat exchanger, etc.) that operate in parallel. Each heat exchanger handles a portion of the thermal load, allowing the system to achieve high thermal output without requiring a single large pressure vessel. This segmentation enables compact individual units while maintaining system-level performance.
Solution Approach 2:
The patent transitions from a single large vertical pressure vessel to a horizontal arrangement of multiple compact heat exchangers connected by piping. This dimensional reconfiguration allows the system to maintain high pressure capabilities while reducing the vertical footprint and distributing the thermal load across multiple smaller units arranged in a compact configuration.
2Productivity
If conventional boilers use single large heat exchange tubes, then the structure is simple, but heat transfer efficiency and modulation capability are poor
Solution Approach 1:
The patent segments the heat exchange function into multiple separate heat exchangers, each with its own heat exchange tubes. This segmentation improves heat transfer efficiency by allowing each tube to be optimized for counterflow heat exchange and by distributing the thermal load across multiple pathways. The multiple heat exchangers can operate in parallel, enhancing overall heat transfer capability while maintaining manageable individual unit complexity.
Solution Approach 2:
The patent incorporates modulation capabilities through multiple heat exchangers that can be independently controlled or selectively activated. This dynamic configuration allows the system to adjust its thermal output by engaging different combinations of heat exchangers, providing broad modulation range from partial to full capacity operation, thereby improving efficiency across varying load conditions.
3Productivity
If water flows rapidly through heat exchange tubes, then heat transfer is enhanced, but pressure losses increase
Solution Approach 1:
The patent divides the water flow path into multiple parallel channels through separate heat exchangers. This segmentation allows water to flow at optimized velocities in each channel, achieving effective heat transfer without excessive pressure losses. The parallel arrangement distributes the total flow across multiple pathways, reducing the velocity and pressure drop in each individual channel while maintaining overall heat transfer effectiveness.
Solution Approach 2:
The patent employs counterflow heat exchange configuration where water and combustion gases flow in opposite directions through the heat exchange tubes. This dimensional arrangement of flow paths maximizes the temperature differential across the heat exchange surface, enhancing heat transfer efficiency without requiring excessively high water flow velocities, thereby reducing pressure losses.
4Power
If the boiler is designed for high thermal output, then meeting building demand is ensured, but the equipment size becomes large
Solution Approach 1:
The patent achieves high thermal output by arranging multiple heat exchangers in parallel, where each unit contributes to the total heating capacity. This segmentation allows the system to scale thermal output through the addition of multiple compact units rather than requiring a single large-volume pressure vessel. The cumulative effect of multiple smaller heat exchangers provides high thermal capacity in a reduced overall equipment footprint.
Solution Approach 2:
The patent combines multiple heat exchangers and their associated heat exchange tubes into a single integrated boiler assembly. This merging of multiple functional units maintains the high thermal output capability while consolidating the equipment into a compact configuration that fits within standard installation spaces, effectively combining the capacity of multiple units without the volume of a single large vessel.
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 output with a small footprint, efficient heat transfer exceeding 90% efficiency, and broad modulation capabilities, reducing corrosion and noise while maintaining a compact form factor suitable for industrial use.
Implementation Method 1
a plurality of heat exchangers (16a, 16b) provide for heat transfer between a first fluid and a second fluid
Implementation Method 2
counterflow heat transfer
Implementation Method 3
The burner assembly (14) includes an outer containment vessel (30), a combustion chamber housing (32) disposed inside the outer containment vessel, and a burner (34) positioned internally within combustion chamber housing (32). The combustible mixture is ignited in the burner (34)
Implementation Method 4
Expansion joints (42) couple combustion chamber housing (32) to heat exchanger (16), and act to absorb stresses due to thermal expansion and contraction
Data Source
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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.