Switchable Roof-Cabin Passage for Dynamic Thermal Management
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Solution Overview
Problem
Conventional vehicle cabin cooling systems fail to effectively utilize a cooler roof for cooling the cabin while maintaining passenger comfort, as the permanent insulation layer does not allow for temperature regulation based on the roof and cabin temperature differences.
Innovation Solution
A vehicle system with a switchable passage between the roof and cabin, utilizing a bi-metal or tri-metal switch or a porous material with negative thermal expansion, which adjusts its mode based on temperature differences to either allow or prevent heat transfer, ensuring comfort by using a cold roof for cooling when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a permanent insulation layer is used between the roof and cabin, then the cabin is insulated from the roof, but the cabin cannot be cooled when the roof temperature is lower than the cabin temperature
Solution Approach 1:
The patent applies the dynamics principle by making the insulation layer switchable rather than permanent. The insulation layer can be dynamically adjusted between an inserted state (providing insulation) and a removed state (allowing thermal contact), enabling the system to adapt to different temperature conditions between the roof and cabin.
Solution Approach 2:
The patent applies parameter changes by using a bi-metal or tri-metal switch that responds to temperature differential changes. When the temperature difference between roof and cabin exceeds a threshold, the thermal expansion/contraction of the bi-metal switch changes the state of the insulation layer, thereby changing the thermal parameter of the system.
2Temperature
If the insulation layer is permanently removed to utilize the cooler roof for cooling, then the cabin can be cooled, but the driver and passengers feel uncomfortable when the cabin temperature drops below a certain temperature
Solution Approach 1:
The switchable insulation layer dynamically adjusts the thermal coupling between roof and cabin based on temperature conditions, providing cooling when needed while maintaining insulation for comfort, thus resolving the contradiction between cooling effectiveness and passenger comfort.
Solution Approach 2:
The bi-metal or tri-metal switch provides automatic feedback control based on the temperature differential between roof and cabin. When the cabin becomes too cold, the switch detects the temperature change and automatically reinstates the insulation layer, preventing excessive cooling and maintaining passenger comfort.
3Adaptability or versatility
If a switchable passage is introduced to control heat transfer, then the system can regulate temperature, but the device complexity increases
Solution Approach 1:
The bi-metal or tri-metal switch enables the system to be self-regulating based on temperature differential. The switch automatically opens or closes the passage for heat transfer without requiring external control systems, sensors, or power sources, thereby adding minimal complexity while achieving adaptive temperature regulation.
Solution Approach 2:
The patent uses thermal expansion/contraction of bi-metal or tri-metal materials as the switching mechanism. This passive thermal actuation mechanism avoids the need for active control systems, motors, or electronic components, keeping the device complexity low while providing intelligent temperature-based regulation.
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 solution allows for efficient cabin cooling using a cold roof while maintaining comfort by dynamically regulating heat transfer, ensuring the cabin temperature remains within a comfortable range.
Implementation Method 1
The bi-metal or tri-metal switch may operate based on comparison between the roof temperature and the cabin temperature
Implementation Method 2
The passage may be formed at least in part by a porous material with a negative coefficient of thermal expansion
Implementation Method 3
an insulation layer disposed between the roof and the cabin
Data Source
AI summary
Vehicles and methods for cooling a cabin using a cold roof of the vehicle are provided. The vehicle includes a roof, a cabin, and an insulation layer disposed between the roof and the cabin. The vehicle also includes a passage that fluidly couples the roof with the cabin. The passage is switchable between an open mode and a closed mode. The passage is switched between the open mode and the closed mode depending on a relationship between a roof temperature, a cabin temperature, and/or a threshold temperature. The passage may be formed through the insulation layer or extend outside of the insulation layer fluidly coupling the roof with the cabin.