Dual-Mode Vehicle Cabin Thermal Management System
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Solution Overview
Problem
Conventional vehicle cabin thermal management systems face challenges such as noisy blower motors, high power consumption, and reduced heat transfer efficiency during initial start-up, primarily due to reliance on convective heat transfer and slow propulsion system warming.
Innovation Solution
A dual-mode thermal management system incorporating a convective HVAC system and non-convective radiant or conductive heating devices, controlled by a processor that adjusts the thermal output of each system to optimize heat transfer and reduce power consumption, using a controller to manage the operation of both systems based on calculated cabin heating demand and comfort temperature offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the HVAC system operates at high power during initial start-up, then the heating capacity is improved, but the power consumption increases significantly
Solution Approach 1:
The heating system is segmented into two independent subsystems: the HVAC system for convective heating and the auxiliary heating system for radiant/conductive heating. This segmentation allows each subsystem to operate independently based on specific conditions, enabling the auxiliary system to provide immediate heating without requiring the HVAC system to consume high power during start-up, thus resolving the contradiction between heating capacity and power consumption.
Solution Approach 2:
The auxiliary heating system activates in advance during initial start-up conditions to provide immediate heating capacity before the HVAC system is fully warmed up and operational. This preliminary action by the auxiliary system ensures heating demand is met without requiring the HVAC system to operate at high power consumption levels, particularly during the warm-up period when the propulsion system is still heating up.
2Productivity
If the blower motor operates at high speed to increase heat transfer, then the heating efficiency is improved, but the noise level increases
Solution Approach 1:
The heating system is divided into two independent subsystems: the HVAC system that generates noise through blower motor operation, and the auxiliary heating system that provides heat transfer without requiring high-speed blower operation. By segmenting the system, the auxiliary heating can deliver effective heat transfer during initial start-up without activating the noisy blower motor, thus achieving high heat transfer efficiency while minimizing noise generation.
3Temperature
If the HVAC system operates during initial start-up, then the cabin heating is improved, but the system warm-up time increases power consumption
Solution Approach 1:
The auxiliary heating system performs preliminary heating action during the initial start-up phase when the HVAC system is still warming up. This preliminary action by the auxiliary system ensures that cabin heating requirements are met immediately without waiting for the HVAC system to reach operational temperature, thereby reducing the overall power consumption during the warm-up period while maintaining effective cabin heating.
Solution Approach 2:
The auxiliary heating system acts as an intermediary during the transition period when the HVAC system is warming up. It provides the necessary heating capacity to meet cabin demands while the HVAC system is not yet fully operational, serving as a bridge that reduces power consumption during the warm-up phase without compromising cabin heating effectiveness.
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 reduces power consumption and noise levels of the HVAC system while achieving faster occupant comfort and efficient heat transfer by leveraging non-convective modes during initial start-up and varying operating levels of heat transfer devices to match cabin heating demands.
Implementation Method 1
a first heat exchange system adapted to operate primarily based upon a convective mode of heat transfer within a vehicle cabin
Implementation Method 2
a second heat exchange system adapted to operate primary based upon a non-convective mode of heat transfer within the vehicle cabin
Implementation Method 3
the second heat exchange system includes a conductive heater
Data Source
AI summary
A vehicle cabin thermal management system includes a first heat exchange system adapted to operate primarily based upon a convective mode of heat transfer within a vehicle cabin, a second heat exchange system adapted to operate primary based upon a non-convective mode of heat transfer within the vehicle cabin, and a controller in communication with the first heat exchange system and the second heat exchange system, wherein the controller controls a thermal output of the second heat exchange system, and wherein the controller controls the first heat exchange system to reduce the operating level of the first heat exchange system in response to the controller operating the second heat exchange system.