Heat Exchanger Interior Coating System

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Solution Overview

Problem

Mineral scale deposits in heat exchangers, caused by minerals in water, lead to inefficient heat transfer and require costly maintenance through water treatment compositions, which are not always effective.

Innovation Solution

A system and method for applying a thermally conductive coating, such as electroless nickel solutions, directly to the interior surfaces of heat exchangers using a pumping mechanism, ensuring uniform coverage and minimizing waste by targeting only the interior surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If water treatment compositions are added to water heaters to prevent mineral scaling, then mineral scale deposit formation is reduced, but maintenance complexity and operational cost increase due to monitoring and replenishment requirements

Engineering Contradiction:

Improvemineral scale deposit formationVSAvoidmaintenance complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The heat exchanger is pre-coated with a scale-resistant material during manufacturing before deployment. This preliminary protective action eliminates the need for ongoing water treatment compositions and maintenance interventions, as the coating provides permanent protection against mineral scale formation from the outset

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The heat exchanger coating provides autonomous protection against scaling without requiring external monitoring or replenishment systems. The coating self-maintains its protective function throughout the heat exchanger's operational life, eliminating the need for active maintenance interventions

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If water treatment compositions are used to prevent scaling, then mineral scale deposits are reduced, but operational cost increases due to continuous replenishment requirements

Engineering Contradiction:

Improvemineral scale deposit formationVSAvoidoperational cost

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of using expensive, continuously replenished water treatment compositions, the invention employs a one-time, low-cost coating applied during manufacturing. This disposable-like approach (applied once, lasts indefinitely) significantly reduces operational costs compared to recurring chemical treatment expenses

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Manufacturing precision

If the heat exchanger is immersed in a tank of coating solution, then the coating solution can be applied to the interior surfaces, but the coating solution contacts the exterior surfaces causing unnecessary waste and potential contamination

Engineering Contradiction:

Improvecoating application coverageVSAvoidcoating solution waste

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The heat exchanger coating process is segmented into two distinct approaches: either the heat exchanger is divided from the tank with selective immersion, or a masking box is used to segment the coating application zone. This ensures the coating solution only contacts the interior surfaces that require coating, preventing waste on exterior surfaces

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A masking box is introduced as an intermediary device between the heat exchanger and the coating solution tank. This masking box allows the coating solution to reach the interior surfaces through controlled openings while preventing contact with exterior surfaces, thus eliminating unnecessary waste and potential contamination

Inventive Principle:

Principle #24Intermediary (Mediator)

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 coating significantly reduces mineral scale formation, enhances thermal efficiency, and provides wear resistance and corrosion protection, while being cost-effective and environmentally friendly.

Implementation Method 1

a thermally conductive coating, such as electroless nickel solutions, directly to the interior surfaces of heat exchangers

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Implementation Method 2

using a pumping mechanism, ensuring uniform coverage and minimizing waste by targeting only the interior surfaces

Methodology Applied

Scientific EffectPumping: Pump

Data Source

PatentUS11835307B2Applying coatings to the interior surfaces of heat exchangers

Publication Date: 2023.12.05 RHEEM MFG CO

AI summary

A system for coating an interior surface of a heat exchanger includes a tank for storing the coating solution, a pump, a source line for supplying the coating solution to the heat exchanger, and a return line for returning the remainder of the coating solution to the tank. The system can include a pre-treatment line for supplying a pre-treatment solution to the heat exchanger and a water line for supplying water to the heat exchanger. An air compressor can be coupled to the heat exchanger to force the coating solution, the pre-treatment solution, or the water from the heat exchanger.