Experimental study on performance of a planar membrane humidifier for a proton exchange membrane fuel cell stack

► The water recovery ratio represents well the humidification performance of a membrane humidifier. ► The DPAT of the membrane humidifier decreases with increasing the wet inlet dew point. ► The stack-humidifier assembly is 10% less than the stack in the electrochemical performance. ► The stability and reliability of the membrane humidifier are acceptable.