Offset PTC Heat Exchanger Layout for Compact Vehicle Heating
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Solution Overview
Problem
Conventional electric auxiliary heaters for vehicles require significant installation space and lack efficient physical separation of PTC heating registers, leading to uneven heating and safety concerns, especially in high-voltage applications.
Innovation Solution
A heat exchanger design featuring at least one first and one second heating register arranged offset within a single frame, with through-flow grid elements and fin elements creating separate heating networks, reducing installation space and enhancing safety through physical separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two or more PTC heating devices are used to increase heating output, then heating efficiency is improved, but installation space increases
Solution Approach 1:
The patent combines multiple heating registers (first and second heating registers with PTC heating devices) into a single frame structure. The heating registers are arranged offset from each other within the same frame, allowing multiple heating elements to occupy a compact shared space rather than requiring separate frames for each heater, thereby increasing heating output while minimizing installation space.
Solution Approach 2:
The heating registers are arranged in an offset configuration within the frame, utilizing three-dimensional spatial arrangement rather than simple linear or planar placement. This dimensional optimization allows multiple heating elements to be positioned at different locations (front side and rear side offset arrangement) to maximize heat output within the constrained air duct cross-section.
2Productivity
If heating registers are arranged one behind the other in separate frames, then heating capacity is increased, but physical separation and safety are compromised
Solution Approach 1:
Multiple heating registers are merged into a single frame structure with integrated support. The frame provides a unified mechanical framework that holds both the first and second heating registers in an offset arrangement, ensuring proper spacing and physical separation between heating elements while maintaining structural integrity and safety within a compact design.
3Area of stationary object
If PTC heating devices are placed close together to save space, then installation space is reduced, but uneven heating occurs
Solution Approach 1:
The heating registers are positioned at different locations within the frame (front side and rear side offset arrangement) to create localized heating zones. This spatial distribution ensures that each PTC heating device operates in its own optimized airflow environment, preventing uneven heating while maintaining compact installation space within the air duct.
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 achieves increased heat output efficiency while minimizing installation space and ensuring safety, particularly in high-voltage applications, by allowing multiple heating registers to be closely arranged and providing effective insulation and air flow management.
Implementation Method 1
the conversion of electrical energy from the vehicle's on-board network into heat takes place in a PTC element (Positive Temperature Coefficient). This ceramic PTC thermistor is a very strongly temperature-dependent semiconductor resistor.
Implementation Method 2
This ceramic PTC thermistor is a very strongly temperature-dependent semiconductor resistor. This means that the resistance of the ceramic element increases significantly as the temperature increases. This prevents overheating
Implementation Method 3
a heat exchanger, in particular an electric auxiliary heater for a motor vehicle, is provided with at least one first heating register having at least one heating element and at least one second heating register having at least one heating element
Data Source
AI summary
The exchanger has a heating element including a set of positive temperature coefficient heat coils in which a frame (2) i.e. plastic frame, is arranged, where the frame includes a front side (3) and a rear side (4). The heat coils are arranged at the front side and rear side of the frame relative to each other, and a set of rib elements is arranged between the heat coils. One of the rib elements on the front side lies opposite to one of the heat coils on the rear side, where another rib element on the rear side lies opposite to another heat coil on the front side.