Water Heater Bypass Microbubble Descaling for Heat Exchangers
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Solution Overview
Problem
In water heaters with heat exchangers, scale buildup in areas with high water hardness reduces heat transfer efficiency, leading to increased fin temperatures and potential tube cracking, requiring special maintenance for removal.
Innovation Solution
A water heater system with a bypass and microbubble generator that automatically removes scale by switching the water flow path to bypass the heat exchanger, using microbubbles generated by a swivel wheel, compression, and decompression portions to agitate and release dissolved air, eliminating the need for special maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water flows through the heat exchanger in areas with high water hardness, then hot water is delivered for use, but scale builds up inside the heat exchanger tubes, deteriorating heat transfer efficiency and eventually causing tube cracking
Solution Approach 1:
The system performs preliminary detection of scale buildup by monitoring temperature rise after hot water delivery stops. When scale is detected, the system proactively switches water flow to the bypass path before actual damage occurs, preventing tube cracking and maintaining reliability while continuing to deliver hot water through the heat exchanger in normal operation
Solution Approach 2:
The invention extracts the harmful scale buildup effect by introducing a bypass path that allows water to flow outside the heat exchanger tubes. This separates the hot water delivery function (through the heat exchanger) from the scale prevention function (through the bypass), enabling the system to remove scale-carrying water from the heat exchanger interior periodically
2Reliability
If the abnormal temperature sensor detects high temperature due to scale buildup, then the system notifies the user and lowers burner capacity, but the water heater can only be temporarily used and special maintenance is still required
Solution Approach 1:
The system performs self-diagnosis by detecting temperature rise after hot water delivery stops, automatically determining scale buildup without user intervention. The control unit then autonomously switches the water flow path to the bypass and activates the microbubble generator, enabling automatic scale removal without requiring user awareness or manual maintenance actions
Solution Approach 2:
The microbubble generator introduces air bubbles as an intermediary substance into the water flow path. These microbubbles attach to scale deposits inside the heat exchanger tubes, facilitating scale removal through the bypass flow without requiring direct mechanical contact or chemical treatment, thus eliminating special maintenance
3Productivity
If the heat exchanger operates continuously in high hardness water, then hot water delivery is maintained, but heat transfer efficiency deteriorates due to scale buildup on the heat exchanger surface
Solution Approach 1:
The system operates in periodic cycles: during normal hot water delivery, water flows through the heat exchanger for efficient heating; after delivery stops and temperature rise is detected indicating scale buildup, the system switches to bypass flow for a predetermined period to remove scale; this periodic alternation maintains heat transfer efficiency while ensuring continuous hot water supply capability
Solution Approach 2:
The system changes the water flow path parameter from 'through heat exchanger' to 'through bypass' based on detected scale buildup conditions. This parameter change allows the system to switch between hot water delivery mode (high productivity) and scale removal mode (energy efficient), preventing permanent efficiency deterioration
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 system effectively removes scale buildup, maintaining heat efficiency and preventing tube damage without requiring special maintenance, as confirmed by literature on bubble behavior in hot-water supply systems.
Implementation Method 1
a microbubble generator for generating microbubbles is provided on the bypass. The microbubble generator includes a water agitator portion, a compression portion and a decompression portion
Implementation Method 2
a burner, a heat exchanger that is heated by the burner
Implementation Method 3
the water is heated by heat exchange between the burner combustion gas and the water
Data Source
AI summary
A water heater includes a bypass that is formed, on the side of a water supply pipe, branching from a main water path and bypassing a part of the main water path, and a flow path switching unit (a valve and a stepping motor) that is formed at a branching portion of the main water path and the bypass. The flow path switching unit is controlled by a controller and that can selectively switch a flow path between the main water path and the bypass. A microbubble generator generating microbubbles is provided on the bypass, the microbubble generator including a water agitator portion, a compression portion and a decompression portion. When the controller determines that scale has built up, the flow path is switched to the bypass by the flow path switching unit, and water containing microbubbles is caused to flow inside the water heater.