B4.2 - Optimization of silica gel beds for the use in humidity controller setups
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- B4 - Sensor Materials
- N. Rogge, S. Hofmeister, T. Fröhlich - Technische Universität Ilmenau (Germany), F. Hilbrunner - Sartorius Weighing Technology GmbH, Göttingen (Germany)
- 257 - 261
The problem, discussed in this work, is the optimization of the silica gel temperature control. For fast temperature changes of the silica gel, a high density packed bed of silica gel would be necessary. But this would slow down the moisture transport in the silica gel bed due to the much faster transport in air, than on surfaces or in solid bodies.
To predict the behavior of the humidity control system, simulations were performed to preselect promising silica gel bed geometries. In Simulation of the moisture transport the nonlinear sorption isotherms of the silica gel had to be taken into account, to represent the influence of dew point itself on the dynamics of changes in dew point temperature.
The contribution deals with influences on the static and the dynamic performance of the humidity control system such as heater geometry, silica gel grain size and the microporous structure of the silica gel. Furthermore the characteristics of the test system have to be considered, to build up a model describing a humidity control system.