Ionic membrane dehumidifier

RD1 150x150 Ionic membrane dehumidifier

Smallest of the Rosahl SPE dehumidifiers

Ionic membranes are used in many industrial areas such as fuel cell technology, chemical engineering, and for water improvement.  The ROSAHL solid polymer electrolyte (SPE) membrane is a low power, maintenance free steady state dehumidifier for enclosed cabinets.  This makes it ideal for applications where maintenance is difficult or costly such as CCTV cameras and traffic gantries.  It is also suitable for use in for museum displays, gun cabinets and for scientific storage.  Discuss applications with your equipment supplier or contact us direct at ROSAHL

A range of SPEs is available that deliver dehumidifying capacities from 0.2 grams/day from a 0.2M3 (7 cu ft) space to 58 grams/day from an 8M3 (280 cu ft.  The smallest version has dimensions 24x30x5.5mm has an average power consumption of 80mW at 3V d.c.   ROSAHL is not suitable for general domestic applications

A ROSAHL dehumidifier consists of a proton-conductive solid polymer electrolyte and porous electrodes with a catalytic layer composed of noble metal particles. When a voltage is applied to the porous electrode attached to the membrane the moisture on the anode side (dehumidifying side) dissociates into hydrogen ions (H+) and oxygen: the hydrogen ions migrate through membrane to be discharged on the cathode (moisture discharging) side where they react with oxygen in the air, resulting in water molecules (gas), being discharged.

electrolysis Ionic membrane dehumidifierScientific paper
Estimation of dehumidifying performance of solid polymer electrolytic dehumidifier for practical application by Shuichi Sakuma, Shiro Yamauchi, Osamu Takai