Helical Ceramic Insert Heat Exchanger Thermal Expansion

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Solution Overview

Problem

In heated energy systems, the use of multiple parallel helical inserts leads to increased tooling and production costs, thermal expansion issues with metal components, and reduced efficiency due to product energy generation migration, necessitating a more efficient and cost-effective solution for heat transfer.

Innovation Solution

A heated energy system incorporating an integral ceramic insert heat exchanger with a helical outer ceramic wall that allows for conductive heat transfer, fabricated using a tool with a silicon carbide channel and resin to form a fluent channel for heat transfer fluid, minimizing thermal expansion and maximizing heat exchange efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple parallel helical inserts are used, then heat transfer efficiency is improved, but tooling and production costs increase

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidtooling and production costs

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The system divides the heat transfer function into multiple parallel helical insert units that can be independently manufactured and then assembled together, allowing efficient heat transfer while maintaining manageable production costs through modular manufacturing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent describes inserting one helical insert inside another concentrically, with inner inserts having smaller diameters than outer inserts. This nested configuration enables multiple heat transfer surfaces within a compact space, improving heat transfer efficiency without proportionally increasing tooling complexity

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If metal materials are used for heat exchangers, then ease of fabrication is improved, but thermal expansion issues worsen

Engineering Contradiction:

Improveease of fabricationVSAvoidthermal expansion stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent employs ceramic materials (such as silicon carbide) that combine the benefits of low thermal expansion with acceptable fabricability through specialized成型 processes. The ceramic inserts provide thermal stability while the manufacturing methods (slurry injection, isostatic pressing, sintering) achieve the desired helical geometries

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If ceramic materials are used for inserts, then thermal expansion stability is improved, but fabrication complexity worsens

Engineering Contradiction:

Improvethermal expansion stabilityVSAvoidfabrication complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The manufacturing process uses preliminary shaping steps where green bodies (unfired ceramic forms) are first formed with the desired helical geometry through slurry injection and isostatic pressing, then later sintered to achieve final density and strength. This preliminary action allows complex geometries to be established before the material becomes too rigid to shape

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses organic binders and slurry materials as intermediaries during fabrication, which allow the ceramic particles to be shaped into complex helical forms. These intermediary materials are later removed or burned out during the sintering process, leaving only the desired ceramic structure

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 ceramic insert heat exchanger enhances heat transfer efficiency by maintaining thermal stability and reducing thermal expansion issues, while minimizing production costs and maintaining system integrity.

Implementation Method 1

an outer ceramic wall that is helical in shape and that allows for conductive heat transfer through the outer ceramic wall

Methodology Applied

Scientific EffectConductive heat transfer: Conduction (thermal)

Implementation Method 2

the outer ceramic wall of the insert body is positioned to be exposed to and to receive heat energy from the products of energy generation

Methodology Applied

Scientific EffectHeat absorption: Absorption (physical)

Data Source

PatentUS8162040B2Heat exchanging insert and method for fabricating same

Publication Date: 2012.04.24 SAINT GOBAIN CERAMICS & PLASTICS INC

AI summary

A heated energy system includes an integral ceramic insert heat exchanger having an integral ceramic construction and an outer ceramic wall that is helical in shape. When the heat exchanger is positioned within a surrounding fluid path enclosure, the outer ceramic wall forms, with the enclosure, at least one spiral path for flowing products of energy generation. No more than one insert body has an outer wall that is helical in shape that is present along the first length of the surrounding fluid path enclosure. The outer ceramic wall receives heat energy when the products of energy generation flow through the fluid path.A method for fabricating integral ceramic insert heat exchangers includes using a tool having a silicon carbide channel and a cavity channel, the silicon carbide channel extending at least partially outside the cavity channel in directions defined by a rotational plane of the tool.