Fuel Cell Pressure Sensor Heater for Ice Melting
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Solution Overview
Problem
In PEM type fuel cell systems, humidified gases and generated water can cause ice formation on pressure sensors at freezing temperatures, leading to malfunction and system shut-down due to improper or no signal output when sensors are powered-up.
Innovation Solution
Integration of a heater, such as a Positive Thermal Coefficient (PTC) heater, within the pressure sensor to rapidly melt ice on the sensing element, ensuring timely and effective operation even at sub-freezing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors are used to detect pressure in fuel cell system, then pressure monitoring capability is improved, but the sensors become frozen at freezing temperatures causing malfunction
Solution Approach 1:
A heater is introduced as an intermediary component within the pressure sensor to counteract the freezing effect. The heater acts as a mediator that prevents ice formation on the sensing element, allowing the sensor to maintain its measurement capability in cold environments without compromising its pressure detection function.
Solution Approach 2:
The temperature parameter of the pressure sensor is actively changed by introducing heating functionality. By raising the local temperature of the sensing element above freezing point, the sensor's operational reliability is improved while maintaining its pressure detection capability in sub-freezing ambient conditions.
2Reliability
If heater is integrated within pressure sensor to melt ice, then sensor reliability at freezing temperatures is improved, but device complexity increases
Solution Approach 1:
The heating function is merged with the pressure sensing function by integrating the heater within the pressure sensor housing. This combination eliminates the need for separate external heating components and control systems, reducing overall system complexity while maintaining sensor reliability in cold temperatures.
Solution Approach 2:
The pressure sensor becomes self-sufficient by incorporating its own heating capability. The sensor automatically prevents ice formation on its own sensing element without requiring external intervention or separate thermal management systems, thereby improving reliability while minimizing additional 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
The solution allows for rapid ice melting within the pressure sensors, preventing system shut-down and ensuring accurate pressure readings, thereby maintaining the integrity and functionality of the fuel cell system during start-up at freezing temperatures.
Implementation Method 1
A pressure sensor for a fuel cell system may include a heater to melt ice within the sensor. As an example, a fuel cell system may be configured to provide motive power for a vehicle. The fuel cell system may include a pressure sensor configured to detect a pressure associated with the fuel cell system and include an internal heating element.
Data Source
AI summary
A fuel cell system may include a fuel cell stack, a manifold in fluid communication with the stack, and a pressure sensor. The pressure sensor may include a housing defining a chamber in fluid communication with the manifold, a pressure sensing element disposed within the chamber, and a heating element disposed within the chamber.