Vehicle Window Insulation Film With Ventilated Air Gap
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Solution Overview
Problem
Conventional thermal insulation films for vehicle windows are ineffective in preventing heat absorption and radiation into the vehicle interior, leading to increased temperature and reduced cooling efficiency.
Innovation Solution
A thermal insulation device with a light-transmissive film unit comprising an outer and inner layer, creating a thermal insulation space with inlet and outlet holes for ventilation, and a heat insulation layer made of tungsten oxide or zinc oxide nanowires to reflect and absorb heat, mounted on the vehicle window to dissipate heat to the bodyshell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional thermal insulation film is attached to the window glass, then the window glass can shield against sunlight, but heat absorbed by the film radiates into the interior space of the car
Solution Approach 1:
The patent introduces an air layer as an intermediary thermal insulation layer between the transparent layer and the heat insulation layer. This air layer acts as a thermal barrier that interrupts the heat transfer path, preventing heat absorbed by the heat insulation layer from radiating into the car interior. The air layer's low thermal conductivity effectively blocks heat transmission while allowing the outer layers to continue providing sunlight shielding.
Solution Approach 2:
The patent creates a composite thermal insulation structure consisting of multiple layers with different functions: a transparent layer for sunlight shielding, a heat insulation layer for heat absorption, and an air layer for thermal insulation. This composite structure combines the advantages of each material type to achieve both sunlight blocking and heat radiation prevention, resolving the contradiction between shielding effectiveness and interior temperature control.
2Object-affected harmful factors
If a thermal insulation film is used to block heat, then sunlight shielding is improved, but cooling efficiency is reduced due to heat radiation into the interior
Solution Approach 1:
The air layer serves as a thermal intermediary that prevents heat energy from reaching the car interior. By positioning this low-conductivity layer between the heat-absorbing film and the interior space, the system blocks heat energy transmission without compromising the cooling system's efficiency. The air layer essentially creates a thermal break that preserves cooling effectiveness.
3Device complexity
If a single-layer thermal insulation film is applied, then the structure is simple, but heat radiation into the interior space cannot be prevented
Solution Approach 1:
The patent transitions from a single-layer film to a multi-layer composite structure comprising a transparent layer, a heat insulation layer, and an air layer. Each layer contributes a specific function: the transparent layer blocks sunlight, the heat insulation layer absorbs heat, and the air layer prevents heat radiation into the interior. This composite approach effectively lowers interior temperature while maintaining reasonable structural complexity.
Solution Approach 2:
The thermal insulation function is segmented into multiple distinct layers, each performing a specific thermal control function. This segmentation allows the system to address different aspects of heat management (sunlight blocking, heat absorption, heat radiation prevention) separately, achieving superior thermal performance compared to a single-layer design.
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
Effectively reduces interior temperature by ventilating the thermal insulation space and dissipating heat away from the seating area, enhancing cooling efficiency and reducing the need for air conditioning.
Implementation Method 1
a heat insulation layer that is disposed on a side surface of the outer layer facing the thermal insulation space, and that is adapted to reflect and absorb heat conducted from the window
Implementation Method 2
a heat insulation layer that is disposed on a side surface of the outer layer facing the thermal insulation space, and that is adapted to reflect and absorb heat conducted from the window
Implementation Method 3
The film unit is formed with a plurality of inlet holes that are in spatial communication with the thermal insulation space and that are adapted to communicate with the seating space, and a plurality of outlet holes that are in spatial communication with the thermal insulation space, such that air in the seating space flows into the thermal insulation space through the inlet holes and is discharged from the thermal insulation space toward the bodyshell through the outlet holes, so as to ventilate the thermal insulation space
Data Source
AI summary
A thermal insulation device includes a film unit including inner and outer layers and a thermal insulation unit. The outer layer is mounted to a window of a vehicle. The inner layer has a peripheral portion connected sealingly to the outer layer, and a center portion spaced apart from and cooperating with the outer layer to define a thermal insulation space therebetween. The film unit is formed with inlet holes communicating with the thermal insulation space and a seating space of the vehicle, and outlet holes communicating with the thermal insulation space and open toward the bodyshell, such that air in the seating space flows into the thermal insulation space through the inlet holes and is discharged from the thermal insulation space toward the bodyshell through the outlet holes. The thermal insulation unit includes a heat insulation layer disposed on the outer layer.