Pressure-Controlled Water Spray Valve for Fuel Cell Radiator Cooling
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Solution Overview
Problem
PEM fuel cells in vehicles face insufficient space for large radiators and fans, limiting cooling system performance and vehicle capabilities, especially in demanding conditions like towing a trailer on steep grades.
Innovation Solution
A thermal management system with a valve assembly that selectively distributes water from a fuel cell stack to spray nozzles or a drain line based on pressure, controlled by a smart pump and controller, allowing multiple operating modes for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large radiator and fan are installed to improve heat rejection capability, then cooling performance is improved, but vehicle space is insufficient
Solution Approach 1:
The patent changes the physical state and delivery method of coolant from a closed-loop pump system to a spray-based direct cooling system. Product water is sprayed directly onto the radiator surface, changing how heat transfer occurs and eliminating the need for large radiators and fans, thus resolving the space constraint while maintaining cooling performance
Solution Approach 2:
The patent extracts the coolant delivery function from the traditional pump-radiator-fan system. By using product water sprayed directly onto the radiator surface, the system eliminates the need for large radiators and fans, reducing space requirements while maintaining heat rejection capability
2Temperature
If product water is sprayed at high pressure to improve cooling efficiency, then heat dissipation is improved, but water may escape through unintended paths
Solution Approach 1:
The patent uses a pressure-controlled valve assembly with multiple orifices of different sizes. The valve responds to water pressure changes by selectively opening different orifices, ensuring that product water is delivered to the radiator at the appropriate pressure and path. This hydraulic control mechanism prevents water escape through unintended paths while maintaining optimal cooling pressure
Solution Approach 2:
The valve assembly provides pressure feedback control - as water pressure increases, the valve automatically transitions between orifices based on pressure thresholds. This feedback mechanism ensures reliable water delivery by adapting the flow path to the actual pressure conditions, preventing water escape while maintaining cooling efficiency
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
Enhances cooling performance by directing water to high-temperature radiators, increasing heat dissipation and reducing coolant temperature, thereby improving vehicle performance.
Implementation Method 1
The controller commands the pump to increase RPM in a first Mode from the first water pressure to a second water pressure, wherein the second water pressure is higher than the first water pressure
Implementation Method 2
a first spray manifold that sprays the liquid product water at the radiator
Implementation Method 3
the valve assembly having a valve housing that selectively delivers the liquid product water to a drain and to a first spray manifold... the first valve assembly selectively communicating the liquid product water to the drain; and a second valve assembly... having a second biasing member that biases a second pin against a second inlet
Data Source
AI summary
A thermal management system for a vehicle having a fuel cell stack is provided. The thermal management system includes a radiator, a storage reservoir, a pump, a valve assembly and a controller. The valve assembly selectively delivers the liquid product water to a drain and to a first spray manifold that sprays the liquid product water at the radiator. The valve assembly includes: a first valve assembly disposed in a drain valve chamber of the valve housing and having a first biasing member that biases a first pin against a first inlet, the first valve assembly selectively communicating the liquid product water to the drain; and a second valve assembly disposed in a second valve chamber of the valve housing and having a second biasing member that biases a second pin against a second inlet, the second valve assembly selectively communicating the liquid product water to the first spray manifold.