 |
| Titel |
Design and performance of an automatic regenerating adsorption aerosol dryer for continuous operation at monitoring sites |
| VerfasserIn |
T. M. Tuch, A. Haudek, T. Müller, A. Nowak, H. Wex, A. Wiedensohler |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 2, no. 2 ; Nr. 2, no. 2 (2009-07-30), S.417-422 |
| Datensatznummer |
250000558
|
| Publikation (Nr.) |
 copernicus.org/amt-2-417-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| Sizes of aerosol particles depend on the relative humidity of their carrier
gas. Most monitoring networks require therefore that the aerosol is dried to
a relative humidity below 50% r.H. to ensure comparability of
measurements at different sites. Commercially available aerosol dryers are
often not suitable for this purpose at remote monitoring sites. Adsorption
dryers need to be regenerated frequently and maintenance-free single column
Nafion dryers are not designed for high aerosol flow rates. We therefore
developed an automatic regenerating adsorption aerosol dryer with a design
flow rate of 1 m3/h. Particle transmission efficiency of this dryer has
been determined during a 3 week experiment. The lower 50% cut-off was
found to be smaller than 3 nm at the design flow rate of the instrument.
Measured transmission efficiencies are in good agreement with theoretical
calculations. One dryer has been successfully deployed in the Amazon river
basin. We present data from this monitoring site for the first 6 months of
measurements (February 2008–August 2008). Apart from one unscheduled
service, this dryer did not require any maintenance during this time period.
The average relative humidity of the dried aerosol was 27.1+/−7.5% r.H. compared to an average ambient relative humidity of nearly 80% and
temperatures around 30°C. This initial deployment demonstrated that
these dryers are well suitable for continuous operation at remote monitoring
sites under adverse ambient conditions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|