Scale Trapping Unit Layout to Prevent Pressure Drop Blockage
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Solution Overview
Problem
Existing scale trapping units for heat exchangers in water heaters suffer from increased pressure drop and blockage due to scale particle accumulation, requiring frequent cleaning or replacement, and existing solutions either consume large amounts of water or have filters that become clogged quickly.
Innovation Solution
A scale trapping unit with a casing and scale adsorbing element having opening ports larger than scale particles, combined with a void region at the water inlet end, allowing water to flow in a constant direction and preventing scale particle deposition and blockage, thereby maintaining high trapping performance over an extended period without maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a scale trapping unit with a scale adsorbing element is used to trap scale particles, then scale deposition on the heat exchanger is prevented, but trapped scale particles accumulate in the upstream portion of the scale trapping unit causing pressure drop increase and gradual blockage
Solution Approach 1:
The scale trapping unit is divided into two functional regions: a scale adsorbing element region for trapping scale particles and a void region for accommodating accumulated scales. This segmentation allows the trapping function and the accumulation space to be separated, preventing blockage in the upstream portion while maintaining effective scale trapping.
Solution Approach 2:
The void region acts as an intermediary space between the scale adsorbing element and the upstream inlet, providing a buffer zone that collects trapped scale particles before they can accumulate in the upstream portion and cause pressure drop increase.
2Duration of action of stationary object
If cleaning is performed to remove scales from the scale adsorbing element, then the adsorbing function is renewed, but large amounts of tap water are required and removed scales may be included in the feed water
Solution Approach 1:
The harmful function of using large amounts of tap water for cleaning is eliminated by providing a dedicated void region that accumulates scales naturally during normal operation. The scale adsorbing element can be cleaned in place or replaced without requiring extensive water flushing, as the void region already contains the accumulated scales that need to be removed.
Solution Approach 2:
The void region automatically accumulates trapped scale particles during normal water flow operation, eliminating the need for active cleaning processes that consume large amounts of tap water. The system self-regulates by directing accumulated scales to the void region where they can be periodically removed without affecting the adsorbing function.
3Reliability
If a detachable filter is used for the scale trapping unit, then scale components can be trapped, but the filter becomes clogged with trapped scale components in a short time requiring frequent replacement
Solution Approach 1:
The filtering function is separated from the accumulation function. The scale adsorbing element provides the trapping capability while the void region provides the accumulation space. This segmentation prevents the filter media itself from becoming clogged, as trapped scales are directed to the void region rather than accumulating on the filter surface.
Solution Approach 2:
The problem of filter clogging is solved by adding a spatial dimension - the void region - where trapped scales can be accommodated. Instead of scales accumulating on the two-dimensional filter surface, they are directed into the three-dimensional void region, extending the filter service life significantly.
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 effectively inhibits pressure drop and blockage in the scale trapping unit, allowing the water heater to operate efficiently for an extended period without the need for cleaning or filter replacement, while maintaining high scale trapping performance.
Implementation Method 1
a scale adsorbing element loaded in the casing, the scale adsorbing element having opening ports
Data Source
AI summary
A scale trapping unit includes a casing having a water inlet and a water outlet at respective ends, and a scale adsorbing element loaded in the casing, the scale adsorbing element having opening ports, each of the opening ports having a representative length greater than a length of a scale particle. The casing has a void region at least at the end where the water inlet is located. A scale trapping unit inlet pipe is perpendicularly connected to a central portion of a bottom surface at the end of the casing where the water inlet is located. The scale trapping unit inlet pipe, the void region, and the scale adsorbing element are linearly aligned so that water flows therethrough in a constant direction.