Integrated Charge Air Heat Exchanger With Self-Regulating Heating
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Solution Overview
Problem
Conventional coolant heaters and charge air coolers for fuel cell stacks are volumetrically inefficient, complex, and costly, requiring additional componentry and packaging space, and lack self-regulation to prevent overheating.
Innovation Solution
An integrated charge air heat exchanger that combines coolant heater and charge air cooler functions into a single unit, using self-regulating heating elements to heat coolant and air streams, with a design featuring coolant conduits, heating elements, and fin elements for efficient heat transfer and temperature regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coolant heaters and charge air coolers are used separately, then heating and cooling functions are achieved, but system complexity and packaging space requirements increase
Solution Approach 1:
The patent combines the coolant heater and charge air cooler into a single integrated heat exchanger unit. The heating elements are positioned within the coolant conduits while fin elements extend into the charge air flow path, allowing both heating and cooling functions to be performed by one component rather than two separate systems
Solution Approach 2:
The integrated heat exchanger performs multiple functions simultaneously: it can heat the coolant during fuel cell start-up, cool the charge air under normal operation, and regulate temperatures through self-regulating heating elements. This multi-functional design eliminates the need for separate dedicated heating and cooling systems
2Reliability
If conventional coolant heaters and charge air coolers are used, then temperature control is achieved, but volumetric efficiency decreases
Solution Approach 1:
By merging the coolant heater and charge air cooler into a single integrated unit with shared housing and overlapping functional zones, the patent significantly reduces the total volume required compared to housing two separate systems. The heating elements and fin elements occupy different spatial zones within the same compact structure
Solution Approach 2:
The heating elements are nested within the coolant conduits, which themselves are integrated into the heat exchanger housing that also accommodates the fin elements. This nested arrangement maximizes space utilization and minimizes the overall packaging volume while maintaining both heating and cooling capabilities
3Temperature
If conventional resistive electrical heating elements are used, then heating function is achieved, but overheating protection requires additional componentry
Solution Approach 1:
The heating elements are designed as self-regulating PTC (positive temperature coefficient) elements that automatically adjust their resistance based on temperature. As the temperature increases, the resistance increases, naturally limiting the current and preventing overheating without requiring external thermostats or control systems
Solution Approach 2:
The PTC heating elements provide inherent temperature feedback through their resistance changes. The electrical resistance automatically increases with temperature, creating a negative feedback loop that prevents overheating. This self-regulating mechanism eliminates the need for additional temperature sensors, control circuits, or safety devices
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 integrated heat exchanger reduces system complexity and cost, minimizes packaging space, and prevents overheating through self-regulating heating elements, effectively maintaining desired temperature ranges for fuel cell stacks.
Implementation Method 1
The heating elements are disposed on a first surface of the coolant conduits and are adapted to transfer heat to the coolant fluid
Implementation Method 2
The fin elements are disposed on a second surface of the coolant conduits and are adapted to transfer heat from the air stream to the coolant fluid
Implementation Method 3
an integrated charge air heat exchanger that combines coolant heater and charge air cooler functions into a single unit
Data Source
AI summary
An integrated charge air heat exchanger for use in a vehicle fuel cell system is provided. The integrated charge air heat exchanger includes a plurality of coolant conduits adapted for a coolant fluid to flow therethrough. The integrated charge air heat exchanger further includes a plurality of heating elements and a plurality of fin elements. One heating element is disposed on a first surface of each of the coolant conduits, and one of the fin elements is disposed on a second surface of each of the coolant conduits. A method for heating the coolant fluid in a first operational mode and cooling a charge air stream in a second operational mode is also provided.