Temperature and Humidity Susceptibility of Instrumentation Components
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32nd Space Simulation Conference Conference Procee↗
Engineering topics
Lujan, Roger W.
Publications and source records attributed to Lujan, Roger W..
CSTT Update: Fuel Quality Analyzer
These are slides from a presentation. The following topics are covered: project background (scope and approach), developing the prototype (timeline), update on intellectual property, analyzer comparisons (improving humidification, stabilizing the baseline, applying clean-up strategy, impact of ionomer content and improving clean-up), proposed operating mode, considerations for testing in real-world conditions (Gen 1 analyzer electronics development, testing partner identified, field trial planning), summary, and future work.
47 OTHER INSTRUMENTATION↗
Recent advances in HC/NO x /NH 3 mixed-potential sensors for engine applications: testing by National Labs, OEM, and Tier-1 suppliers
This report is a presentation by the Advanced Engine Combustion Tech Team. They discuss how to evaluate and test the performance of engine applications.
42 ENGINEERING↗
Codes & Standards Tech Team Update: Fuel Quality Analyzer [Slides]
The development of a device to measure impurities in the fuel stream would be useful to the fuel cell community, hydrogen fueling stations and suppliers.
08 HYDROGEN↗
Durability of Polymer Electrolyte Membrane Fuel Cells Operated at Subfreezing Temperatures
The structure, composition, and interfaces of membrane electrode assemblies (MEA) and gas-diffusion layers (GDLs) have a significant effect on the performance of single-proton-exchange-membrane (PEM) fuel cells operated isothermally at subfreezing temperatures. During isothermal constant-current operation at subfreezing temperatures, water forming at the cathode initially hydrates the membrane, then forms ice in the catalyst layer and/or GDL. This ice formation results in a gradual decay in voltage. High-frequency resistance initially decreases due to an increase in membrane water content and then increases over time as the contact resistance increases. The water/ice holding capacity of a fuel cell decreases with decreasing subfreezing temperature (-10°C vs. -20°C vs. -30°C) and increasing current density (0.02 A cm -2 vs. 0.04 A cm -2 ). Ice formation monitored using in-situ high-resolution neutron radiography indicated that the ice was concentrated near the cathode catalyst layer at low operating temperatures (≈-20°C) and high current densities (0.04 A cm -2 ). Significant ice formation was also observed in the GDLs at higher subfreezing temperatures (≈-10°C) and lower current densities (0.02 A cm -2 ). These results are in good agreement with the long-term durability observations that show more severe degradation at lower temperatures (-20°C and -30°C).
30 DIRECT ENERGY CONVERSION↗
Solid State Electrochemical Sensor R&D
This document presents designs of electrochemical sensors for materials synthesis and integrated devices.
42 ENGINEERING↗