The dual-probe heat-pulse (DPHP) method uses temperature increase with time after heating to measure soil heat capacity, which then is related to soil volumetric water content. The coarse-textured plant growth media being considered for spaceflight applications may lead to problems in contact resistance between the medium and the probes of the DPHP sensor, which may limit the effectiveness of the method. The DPHP method was evaluated in 0.25-1 mm and 1-2 mm fritted clay media. Specific heat, determined using differential scanning calorimetry, was 830 J kg−1 °C−1 at 20 °C for the 0.25-1 mm medium and 810 J kg−1 °C−1 at 20 °C for the 1-2 mm medium. Good agreement between sensor measurements and independent water content measurements obtained through oven-drying was indicated by a linear regression of y = 1.00x + 0.0087 and a standard error of 0.04 cm3 cm−3. The DPHP method can be used to accurately monitor water content in the coarse media being considered for spaceflight applications.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Evaluation of the Dual-probe Heat-pulse Method for Measuring Water Content in Spaceflight Plant Growth Systems


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Conference On Environmental Systems ; 2005



    Erscheinungsdatum :

    2005-07-11




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Re-examining Aeroponics for Spaceflight Plant Growth

    Hoehn, A. / Clawson, J.M. / Stodieck, L.S. et al. | SAE Technical Papers | 2000


    Mass Transport in a Spaceflight Plant Growth Chamber

    Hoehn, A. / Heyenga, A. G. / Clawson, J. et al. | SAE Technical Papers | 1998


    Atmosphere Composition Control of Spaceflight Plant Growth Growth Chambers

    Heyenga, A. Gerard / Hoehn, Alex / Robinson, Erin et al. | SAE Technical Papers | 2000



    Spaceflight Water Supply

    Sulzman, F. M. / Genin, A. M. | AIAA | 1994