Vehicle Heating Unit Airflow Equalization for Uniform PTC Heating
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Solution Overview
Problem
Modern vehicles, including diesel, fuel cell, and hybrid systems, generate less waste heat, leading to inadequate heating for occupants, especially in cold weather, as existing heating units are inefficient in quickly warming the entire passenger compartment.
Innovation Solution
A compact heating unit with a radial fan, curved housing, and airflow-guiding elements ensures uniform airflow through a PTC heating element, using miniature fans to rapidly increase temperature and maintain optimal resistance for efficient heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a radial fan with high air output is used, then the temperature rise speed is improved, but the airflow velocity uniformity deteriorates
Solution Approach 1:
The patent applies local quality by placing airflow-guiding elements (obstacles) specifically in the sector where airflow velocity is highest. These obstacles create local flow resistance that reduces velocity in that specific region, while other regions maintain their natural flow characteristics. This localized intervention equalizes the overall airflow distribution without requiring a complete redesign of the fan or housing.
Solution Approach 2:
The airflow-guiding elements act as intermediary components between the radial fan and the heating element. These obstacles mediate the airflow by redirecting and equalizing the velocity distribution before the air reaches the heating element, thereby protecting the heating system from uneven thermal loading while maintaining high airflow rates.
2Volume of moving object
If a miniature radial fan is used, then the device compactness is improved, but the heating efficiency deteriorates
Solution Approach 1:
The patent changes the airflow distribution parameters by introducing obstacles that modify the velocity profile. This parameter change allows a small fan to achieve effective heating by optimizing how the air flows through the heating element, ensuring uniform thermal contact and maximizing heat transfer efficiency despite the limited fan size and power.
Solution Approach 2:
The patent employs dynamic airflow guidance where obstacles are strategically positioned to actively redirect and equalize airflow in real-time. This dynamic approach allows the compact system to adapt the airflow pattern to maintain optimal heating efficiency, transforming the limitation of small fan size into an opportunity for optimized flow distribution.
3Loss of time
If airflow velocity is increased at one location, then the heating response time is improved, but the electrical resistance stability deteriorates
Solution Approach 1:
The obstacles create local flow resistance in the high-velocity sector, providing localized flow control that balances the overall airflow. This ensures that no single region experiences excessively high velocity that would cause PTC element resistance fluctuations, while still maintaining sufficiently high overall airflow for rapid heating response.
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
The solution provides rapid and uniform heating of the passenger compartment, ensuring occupant comfort and safety by maintaining the PTC heating element's optimal working range, even with a small fan, thereby efficiently warming the vehicle.
Implementation Method 1
a radial fan (130), a curved housing (109) surrounding the fan (130) and defining a pressure chamber (115)
Implementation Method 2
PTC (Positive Temperature Coefficient) heating elements are used, since if the flow velocity is particularly high at one location, the electrical resistance there decreases
Implementation Method 3
airflow-guiding elements (632, 634, 636, 638) arranged between the pressure chamber (115) and the heating element (125)
Data Source
AI summary
A heating unit for a vehicle features a radial fan (100) having a housing (110), which housing has an air inlet (116) and an air exit opening (118). The heating unit has an air-directing device (140) that guides an air flow in a pressure chamber (115) of the housing (110) to the exit opening (118). Arranged in the housing (110) is a radial fan wheel (130) that serves to generate a flow from the air inlet (116) via the pressure chamber (115) to the air exit opening (118). Also provided is an electrical heating element, e.g. a PTC (Positive Temperature Coefficient) heating element (125), that serves to transfer heat to the air flow generated by the fan. Air-directing elements (632, 634, 636, 638) are provided between the exit opening (118) and the heating element (125), in order to generate an air flow having a more uniform (680) velocity distribution.