Comparison of interpretation methods of thermocouple psychrometer readouts
Materiały konferencyjne
MNiSW
15
WOS
| Status: | |
| Autorzy: | Guz Łukasz, Majerek Dariusz, Sobczuk Henryk, Guz Ewa, Połednik Bernard |
| Dyscypliny: | |
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| Rok wydania: | 2017 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Arkusze wydawnicze: | 0,57 |
| Język: | angielski |
| Numer czasopisma: | 1 |
| Wolumen/Tom: | 1866 |
| Numer artykułu: | 040013 |
| Web of Science® Times Cited: | 0 |
| Scopus® Cytowania: | 1 |
| Bazy: | Web of Science | Scopus | AIP |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | TAK |
| Nazwa konferencji: | 22nd International Meeting of Thermophysics (Thermophysics) / 4th Meeting of the Energy and Responsibility (EnRe) 2017 |
| Skrócona nazwa konferencji: | 22nd THERMOPHYSICS 2017 and 4th EnRe 2017 |
| URL serii konferencji: | LINK |
| Termin konferencji: | 12 września 2017 do 14 września 2017 |
| Miasto konferencji: | Terchova |
| Państwo konferencji: | SŁOWACJA |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| Thermocouple psychrometers allow to determine the water potential, which can be easily recalculated into relative humidity of air in cavity of porous materials. The available typical measuring range of probe is very narrow. The lower limit of water potential measurements is about −200 kPa. On the other hand, the upper limit is approximately equal to −7000 kPa and depends on many factors. These paper presents a comparison of two interpretation methods of thermocouple microvolt output regarding: i) amplitude of voltage during wet-bulb temperature depression, ii) field under microvolt output curve. Previous results of experiments indicate that there is a robust correlation between water potential and field under microvolt output curve. In order to obtain correct results of water potential, each probe should be calibrated. The range of NaCl salt solutions with molality from 0.75M to 2.25M was used for calibration, which enable to obtain the osmotic potential from −3377 kPa to −10865 kPa. During measurements was applied 5mA heating current over a span 5 s and 5 mA cooling current aver a span 30s. The conducted study proves that using only different interpretation method based on field under microvolt output it is possible to achieve about 1000 kPa wider range of water potential. The average relative mean square error (RMSE) of this interpretation method is 1199 kPa while voltage amplitude based method yields average RMSE equaling 1378 kPa during calibration in temperature not stabilized conditions. |
