BuffermetryFundamentals of moisture buffering Properties of hygroscopic materials Diffusion enhanced materials and structures Experimental: Sorption experiments Experimental: Diffusion experiments Incorporating the buffer in the construction Whole room simulations and experiments Experiment in the Passys environmental room Appendices - instruments and procedures Wiki howto |
Quick link to operating instructions The flux generatorThe flux generator is a cylinder, roughly 80 cm across and deep. It has an airtight lid. The temperature is controlled by air circulating in a sealed annular cavity around the cylinder. Within the chamber the specimen is exposed to a flux of water vapour. This vapour comes from a tank, holding about 250 ml of water. The tank is warmed or cooled by a Peltier device. The tank is weighed every minute. The RH is measured by a dew point sensor. The chamber can be set to a fixed or varying RH or water vapour flux. The picture below shows a test frame of end grain wood tiles, sealed on back and sides.  Technical detailsThe flux generator has been rebuilt. Here is the proposal (2008-10-06). The as built description is here(pdf 1 Mb) The rebuild was completed 2008-11-27 Modification to weighing beam pivots: Tinman current files Keep this up to date! Hourly data from October 2008 to May 2010. Date-hour-run number-RH-weight-temperature. gnuplot script for the data linked above. awk script to reduce tinman data to hourly average of selected variables. A complete description of the climate chamber, its programs and wiring diagrams is here: http://www.padfield.org/tim/cfys/megacup/climate_chamber_description.pdf |