Abstract
Realizing the effect of venting on temperatures in a solar kiln, average kiln temperatures were measured in a solar kiln with automatic vent control. These temperatures were found to be less than 2°C above ambient with the wood above fibre saturation point and increased to about 10°C when the wood reached 12% moisture content. The effect of these relative small differences between kiln and ambient temperatures on the drying rate were investigated as well as methods to increase the average temperature in a solar kiln.
Zusammenfassung
Da es bekannt ist, daß die Ventilation die Temperatur im Solartrockner stark beeinträchtigt, wurden die Temperaturen in einem Solartrockner mit vollautomatischer Ventilationssteuerung untersucht. Es ergab sich, daß die Temperaturen im Trocknungsbereich von grün bis 30% im Durchschnitt kaum 2°C über der Außentemperatur lagen und daß diese Temperaturdifferenz bei 12% Holzfeuchte bis 10°C anstieg. Der Einfluß dieses geringen Temperaturunterschiedes auf die Trocknungsgeschwindigkeit wurde zusammen mit Methoden, um die Durchschnittstemperatur im Solartrockner zu erhöhen, untersucht.
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Literatur
Chen PYS, Helmer WA (1987) Design and tests of a solar dehumidifier kiln with heat storage and heat recovery systems. For Prod J 37(5):26–30
Helmer WA, Chen PYS (1987) Model development and economic evaluation of a sensible heat storage unit utilized in a solar-dehumidification lumber drying system. Wood and Fibre Science 19 (3):246–261
Maldonado, ED, Peck EC (1962) Drying by solar radiation in Puerto Rico. For Prod J 12 (10):487–488
Oliveira LC de S, Skaar C, Wengert EM (1982) Solar and air lumber drying during winter in Virginia. For Prod J 32 (1):37–44
Read WR, Choda A, Cooper PI (1974) A solar timber kiln. Solar Energy 15:309–316
Schneider A, Wagner L (1980) Vergleichende Untersuchungen über die Freilufttrocknung und Solartrocknung von Schnittholz unter mitteleuropäischen Wetterverhältnissen. Teil 2: Ergebnisse im zweiten Vesuchsjahr; Erkenntnisse und Folgerungen für die Solartrocknung in der Praxis. Holz Roh-Werkstoff 38:313–320
Steinmann DE, Vermaas HF (1990) Control of equilibrium moisture content in a solar kiln. Holz Roh-Werkstoff 48:147–152
Steinmann DE, Vermaas HF, Forrer JB (1980) Solar timber drying kilns: Part I: Review of previous systems and control measures and a description of an automatic solar kiln. J Inst Wood Sci 8 (6):254–257
Steinmann DE, Vermaas HF, Forrer JB (1981) Solar timber drying kilns: Part II: Micro processor control of a solar kiln. J Inst Wood Sci 9 (1):27–31
Tschernitz JL (1986) Solar energy for wood drying using direct or indirect collection with supplemental heating. A computer analysis. United States Department of Agriculture. Forest Service Research Paper FPL-RP-477
Tschernitz JL, Simpson WT (1977) Solar kilns: feasibility of utilizing solar energy for drying lumber in developing countries. United States Department of Agriculture. Forest Service. FLP-AID-PASA TA (AG) 02-75 (solar kilns)
Tschernitz JL, Simpson WT (1985) FPL design for lumber dry kiln using solar/wood energy in tropical latitudes. United States Department of Agriculture. Forest Service General Technical Report FPL-44
Vick CB (1968) Low-temperature drying of 1-inch sweetgum. For Prod J 18 (4):29–32
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Steinmann, D.E. Temperature control in a solar kiln. Holz als Roh-und Werkstoff 48, 287–291 (1990). https://doi.org/10.1007/BF02626520
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DOI: https://doi.org/10.1007/BF02626520