Humidification sensitivity test

Four levels of relative humidity (RH) are considered for hydrogen (or fuel) and three for air (or oxidant) in this humidification sensitivity test. Among the inputs. 

Similarly, the loss in cell performance at one level of reactant RH can be compared with the RH levels of the other reactant. The cell has passed the humidification sensitivity test when the acceptance criterion is met for example, the cell does not exceed a specified loss in performance (voltage or power) for the given range of reactant RH at the applied current densities and the other operating conditions (cell temperature, pressure, or reactant stoichiometry) [8]. 

O., Sitters, E., and Heinz, G. (2010) Testing the Humidification Sensitivity of a Single PEEC, Characterisation of the performances of a PEEC operating with fuel and oxidant at various relative humidity, Test Module PEEC SC 5-1, http //fctesqa.jrc.ec.europa.eu/downloads/ PEMSCLV/Umidification sensitivity TestProcedure.pdf, European Commission, Joint Research Centre, Institute for Energy, Petten (last accessed 10 December 2011). 

The evolution of the voltage V over time (test duration) is the main output of this type of test The power density can be calculated as another test output and also the performance (voltage or power) loss between the best (highest ceU voltage) level of reactant humidification (usually corresponding to humidification step number 12) and the other levels to compare the ceU sensitivity with reactant humidification. The performance loss is calculated as a fraction (or percentage) as follows ... 

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