Proceedings of the American Control Conference
For temperature and humidity control of fuel cell reactants, a gas humidification apparatus was designed and constructed. We then developed a low-order, control-oriented model of the humidification system thermal dynamics based on first principles. A simple and reproducible methodology is then employed for parameterizing the humidification system model using experimental data. Finally, the system model is experimentally validated under a wide range of operating conditions. It is shown that a physics based estimation of the air-vapor mixture relative humidity leaving the humidifier system (supplied to the fuel cell) is possible using temperature and pressure measurements. This estimation eliminates the need for a bulky and expensive humidity sensor and enables the future application of temperature feedback control for thermal and humidity management of the fuel cell reactants.
McKay, Denise A.; Stefanopoulou, Anna G.; and Cook, Jeffrey, "Model and Experimental Validation of a Controllable Membrane-Type Humidifier for Fuel Cell Applications" (2008). Engineering: Faculty Publications, Smith College, Northampton, MA.