Radial-Layer Heat Recovery Wheel for Compact Thermal Exchange

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Solution Overview

Problem

Rotary wheel heat recovery ventilators face challenges in wheel effectiveness, pressure drop, material cost, and design complexity, which hinder the development of more compact and efficient ventilation systems.

Innovation Solution

A heat recovery wheel design featuring a plurality of radially arranged passage layers with differently shaped materials, allowing for thermal energy exchange between airflow streams without a parting sheet, enhancing heat transfer while maintaining a compact structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If heat transfer enhancement is implemented in rotary wheel heat recovery ventilators, then heat transfer efficiency is improved, but device complexity and material cost increase

Engineering Contradiction:
Improveheat transfer efficiencyVSAvoiddesign complexity
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The wheel is divided into multiple radial layers, each containing passage structures. By segmenting the wheel into discrete layers with specific passage patterns, the design achieves enhanced heat transfer through increased surface area and optimized airflow paths without requiring complex integrated structures. Each layer can be independently designed and manufactured, reducing overall design complexity while maintaining heat transfer effectiveness.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces a radial layering dimension to the traditional wheel structure. Instead of relying solely on axial or radial passages within a single plane, the design stacks multiple radial layers circumferentially around the wheel axis. This dimensional approach increases the effective heat transfer surface area and creates more efficient thermal exchange paths without significantly increasing the wheel's axial length or overall complexity.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Temperature

If heat transfer enhancement is implemented in rotary wheel heat recovery ventilators, then heat transfer efficiency is improved, but material cost increases

Engineering Contradiction:
Improveheat transfer efficiencyVSAvoidmaterial cost
Core Design Contradiction:
TemperatureVSQuantity of substance

Solution Approach 1:

By segmenting the wheel into multiple radial layers with passage structures, the design maximizes heat transfer surface area within the constraints of available materials. The segmented approach allows for efficient use of material by creating multiple heat exchange zones without requiring excessive material quantity, as each layer contributes to overall heat transfer performance.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The passage structures within each radial layer create a porous-like flow path network that enhances heat transfer efficiency. The arrangement of passages and the resulting airflow patterns through these layered structures improve thermal exchange effectiveness without requiring additional expensive materials, utilizing instead the geometric configuration of existing materials.

Inventive Principle:
Principle #31Porous materials

3Temperature

If the wheel length is increased to improve heat transfer, then heat transfer efficiency is improved, but the compact design is compromised

Engineering Contradiction:
Improveheat transfer efficiencyVSAvoidwheel length
Core Design Contradiction:
TemperatureVSLength of moving object

Solution Approach 1:

The patent achieves enhanced heat transfer without increasing wheel length by utilizing the circumferential dimension through radial layering. Multiple radial layers are stacked around the wheel axis, creating additional heat transfer surface area in the circumferential direction rather than extending the wheel axially. This maintains the compact axial profile while improving thermal exchange efficiency through the multi-layer radial structure.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

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

Improves heat transfer efficiency and reduces material costs by eliminating the need for a parting sheet, maintaining a compact design without increasing the wheel's length, thus addressing the challenges of wheel effectiveness and design complexity.

Implementation Method 1

the plurality of wheel passages are configured for flow of a first airflow and a second airflow therethrough for thermal energy exchange between the first airflow and the second airflow

Methodology Applied
Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS12061050B2Heat recovery ventilator
Publication Date: 2024.08.13 CARRIER CORP
  • US12061050B2 patent drawing
  • US12061050B2 patent drawing
  • US12061050B2 patent drawing

AI summary

A heat recovery wheel for a heat exchanger includes a wheel rim defining an outer perimeter of the heat recovery wheel, and a plurality of wheel passages located between the wheel rim and the wheel axis. The plurality of wheel passages are arranged in a plurality of radial layers relative to a wheel central axis. Each layer is defined by a first shaped material having a first cross-sectional shape and a second shaped material assembled to the first shaped material, the second shaped material having a second cross-sectional shape. Radially adjacent layers of the plurality of layers are secured directly to one another, and the plurality of wheel passages are configured for flow of a first airflow and a second airflow therethrough for thermal energy exchange between the first airflow and the second airflow.