Bus Body Insulation With Aerogel Panels and Multi-Glazed Windows
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Solution Overview
Problem
Conventional buses face challenges in maintaining thermal insulation while minimizing weight and cost, particularly in electric buses where the lack of waste heat from diesel engines requires larger batteries or diesel heaters, leading to increased energy consumption and reduced range.
Innovation Solution
Implementing a combination of multiple-glazed side windows with a melamine-based foam layer and an aerogel material insulation layer on a metallic framework structure, along with additional insulation measures such as noble gas filling and low-E coatings, to enhance thermal insulation without significantly increasing weight or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional single-glazed windows and basic insulation materials are used, then weight and cost are reduced, but thermal insulation performance deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple insulation layers including aerogel material, melamine foam, and reflective barriers within the window and wall structures. This composite approach achieves superior thermal insulation performance without proportionally increasing weight, as each layer contributes different insulation mechanisms (aerogel for high R-value per inch, melamine for cost-effective bulk insulation, reflective barriers for radiant heat control).
Solution Approach 2:
The patent implements nested insulation structures where multiple insulation layers are arranged concentrically within the window and wall assemblies. The aerogel layers are positioned innermost against the glass panes, surrounded by melamine foam layers, which are in turn enclosed by reflective barriers and outer cladding. This nested arrangement maximizes insulation efficiency within limited space while controlling overall weight.
2Temperature
If conventional single-glazed windows and basic insulation materials are used, then weight and cost are reduced, but thermal insulation performance deteriorates
Solution Approach 1:
The patent applies local quality by concentrating high-performance aerogel insulation at critical thermal bridge locations such as window frames, corners, and junctions between wall sections, where heat loss is most significant. Standard melamine foam is used in less critical areas, optimizing the overall insulation performance while controlling costs through strategic material placement rather than uniform high-cost materials throughout.
Solution Approach 2:
The combination of aerogel, melamine foam, and reflective barriers creates a cost-effective composite insulation system. The reflective barriers provide additional insulation value at relatively low cost, while the layered composite structure allows thinner overall insulation packages compared to single-material solutions, reducing material quantities and installation costs.
3Temperature
If insulation is maximized to improve thermal performance, then thermal insulation improves, but weight increases and energy requirement for drive increases
Solution Approach 1:
The multi-layer composite insulation system achieves high thermal performance with relatively thin overall thickness, reducing the weight penalty compared to conventional single-material insulation. The aerogel layers provide exceptional insulation in thin packages, while reflective barriers add insulation value without significant weight increase, thereby minimizing the impact on energy requirement for drive.
4Temperature
If insulation is maximized to improve thermal performance, then thermal insulation improves, but volume of usable interior decreases
Solution Approach 1:
The nested multi-layer insulation structure allows high-performance insulation to be integrated within the existing body framework without requiring additional external space. The aerogel, melamine, and reflective barrier layers are arranged concentrically within wall and window assemblies, maximizing insulation effectiveness while minimizing intrusion into the usable interior volume.
Solution Approach 2:
The composite insulation system achieves superior thermal performance in reduced thickness compared to conventional single-material insulation. This allows the same or better insulation performance with less overall wall thickness, thereby preserving more usable interior volume in the bus body.
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
Achieves a good balance between insulation properties, weight, and cost, enabling energy savings in both cold and hot weather conditions, and reducing the need for additional heating or cooling capacity.
Implementation Method 1
second planar elements mounted on the metallic framework structure, which are provided at least on one main surface with a first insulation layer made of a melamine-based foam material and with a second insulation layer made of an aerogel material
Implementation Method 2
The aerogel material is a highly porous solid body, the volume of which generally comprises more than 90% of air-filled pores
Implementation Method 3
multiple-glazed side windows mounted on the metallic framework structure as first planar elements; The side windows therefore have two or more glass panes
Implementation Method 4
first insulation layer made of a melamine-based foam material
Implementation Method 5
first insulation layer made of a melamine-based foam material
Data Source
AI summary
A bus for transporting passengers includes a body which surrounds a passenger compartment, wherein the body includes a metallic framework structure and planar elements fastened thereto, and wherein the passenger compartment is thermally insulated from an exterior by an insulation system arranged on the metallic framework structure. The insulation system includes multiple-glazed side windows mounted on the metallic framework structure as first planar elements and second planar elements mounted on the metallic framework structure, which are provided at least on one main surface with a first insulation layer made of a melamine-based foam material and with a second insulation layer made of an aerogel material. A good ratio between insulation properties, weight and costs can be achieved by this combination of planar elements.