Exterior Insulation Panels for Cargo Containers

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Solution Overview

Problem

Existing cargo containers face challenges in achieving high thermal efficiency without reducing interior dimensions or making insulating panels susceptible to damage from cargo loading, which affects their ability to maintain specified temperatures during transit.

Innovation Solution

The method involves attaching insulating panels with an insulating layer and outer skin to the exterior surfaces of the cargo container's walls, roof, and floor, while applying foam insulation to the underframe, thereby enhancing thermal efficiency without compromising interior space or durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If additional insulating materials are placed on the interior of the container, then thermal efficiency is improved, but interior dimensions are reduced and cargo space is reduced

Engineering Contradiction:

Improvethermal efficiencyVSAvoidinterior dimensions

Core Design Contradiction:

Loss of energyVSVolume of moving object

Solution Approach 1:

Instead of placing insulation on the interior surfaces of the container walls, the patent applies insulation to the exterior surfaces. This inversion of the conventional approach allows the insulation to be added without reducing the interior cargo space, as the insulation layer is positioned outside the container's structural walls rather than inside the cargo compartment.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent transitions from a conventional interior insulation approach to an exterior insulation approach, effectively adding insulation in a different spatial dimension relative to the container structure. By moving the insulation from the interior volume to the exterior surface, the solution resolves the conflict between insulation thickness and cargo space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Loss of energy

If additional insulating materials are placed on the interior of the container, then thermal efficiency is improved, but insulating materials are subject to damage from cargo placement

Engineering Contradiction:

Improvethermal efficiencyVSAvoidinsulation durability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

By inverting the conventional approach and applying insulation to the exterior surfaces rather than the interior, the patent protects the insulating materials from damage by cargo placement. The insulation is positioned outside the container where it is not subjected to the mechanical stresses of loading and unloading operations.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If conventional wood and metal members are used in cargo containers, then structural simplicity is maintained, but thermal efficiency is insufficient

Engineering Contradiction:

Improvestructural simplicityVSAvoidthermal efficiency

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent employs composite construction by combining conventional structural materials (wood or metal members) with insulating materials in a layered configuration. The structural members provide the container's strength while the insulating layers (such as foam insulation) provide thermal efficiency, creating a composite structure that achieves both structural integrity and thermal performance.

Inventive Principle:

Principle #40Composite materials

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

This approach significantly improves the thermal efficiency of cargo containers, achieving an R-Value of at least 28 while minimizing thermal shorts and maintaining interior space, and making the insulation less prone to damage.

Implementation Method 1

applying foam insulation to the bottom surface of the underframe

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

attaching at least one insulating panel on an exterior surface of the first side wall, wherein the at least one insulating panel substantially covers the exterior surface of the first side wall

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS7587984B2Insulated cargo containers

Publication Date: 2009.09.15 MARTIN MARIETTA MATERIALS INC

AI summary

A method of insulating an existing cargo container, such as a boxcar. The method allows for the application of improved insulation materials to improve the R-Value of an existing boxcar without building a new boxcar. In one implementation, the method includes preparing multiple insulating panels comprising an insulating layer and an outer skin located on at least one face of the insulating layer and attaching the insulating panels on an exterior surface of the side walls, end walls, and roof of the boxcar. The method also includes installing closures on uncovered areas of the boxcar and applying foam insulation to the bottom surface of the boxcar.