Sliding Stratification Door for Linear HVAC Outlet Temperature Control
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Solution Overview
Problem
HVAC systems in vehicles face challenges in achieving desirable outlet temperatures across different outlets, often resulting in uneven temperature distribution and increased airflow restrictions, which can lead to discomfort for occupants and increased energy consumption.
Innovation Solution
The implementation of a sliding stratification door downstream of the evaporator and temperature control door, which allows air to flow through either a heated path or a bypass path, and is positionable to mix airflows in a bypass cavity before exiting through outlets, thereby enhancing temperature control and distribution without adding significant packaging space or airflow restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a temperature control door is used to direct air through heated or bypass paths, then temperature control capability is improved, but airflow restrictions increase and temperature distribution becomes uneven
Solution Approach 1:
The system divides the single temperature control function into two separate doors: a control door that directs air through the heater, and a stratification door that controls mixing in the bypass cavity. This segmentation allows independent optimization of each door's function, reducing overall airflow restriction while maintaining temperature control capability.
Solution Approach 2:
The stratification door acts as an intermediary element that controls the mixing of heated and bypass air in the bypass cavity. By introducing this intermediate mixing chamber and control mechanism, the system achieves more precise temperature control without the severe airflow restrictions that would result from direct mixing control.
2Temperature
If air mixing is implemented to achieve desirable outlet temperatures, then temperature distribution improves, but packaging space requirements increase
Solution Approach 1:
The stratification door is positioned within the existing bypass cavity structure, nesting the mixing control function within the available space. The door utilizes the existing cavity volume rather than requiring additional space, achieving air mixing functionality without increasing overall packaging requirements.
Solution Approach 2:
The stratification door controls mixing by adjusting the vertical position within the bypass cavity, utilizing the vertical dimension for temperature control. This dimensional approach allows effective mixing control without requiring additional horizontal or lateral space.
3Measurement precision
If a stratification door is added to control air mixing, then temperature control precision improves, but device complexity increases
Solution Approach 1:
The stratification door system combines the mixing control function with the existing bypass cavity structure. By integrating the control door within the cavity rather than adding a separate external mixing mechanism, the system achieves enhanced temperature control precision while minimizing the increase in overall device complexity.
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 configuration ensures a more linear temperature response and comfortable outlet temperatures across various outlets, allowing for independent control of upper and lower air temperatures, while minimizing airflow restrictions and energy consumption.
Implementation Method 1
direct air flows through the bypass path to be mixed within a bypass cavity with air that flowed across the heated path
Data Source
AI summary
An HVAC system includes an evaporator, a heater, a plurality of outlets, and a sliding control door downstream of the evaporator, which is configured to allow air to flow across one or both of a heated path across the heater and a bypass path bypassing the heater. A sliding stratification door is downstream of the temperature control door and positionable to, in an intermediate position, direct air flowing through the bypass path to be mixed with air that flowed across the heated path before flowing out of the plurality of outlets.