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Micro-balance Infrared thermometer Sample Water bath Laser-scan micrometers Heat exchanger Plate 17. Experimental set-up overview Figure 10. Schematic diagram of scanning laser micrometers and sample positioning. Diagram extracted from Perré (2007b). The surface temperature of samples is measured using an infrared thermometer (pyrometer). It uses a germanium lens with a measurement spot size of 2 mm, and measures to an accuracy of 0.6 % of the measured value (in °C). The measurement system is placed in a climatic chamber where the dry-bulb temperature is held constant at 30°C by a proportional-integral-derivative (PID) controller. Relative humidity inside the chamber is controlled using a water bath maintained at the desired dew point temperature. A refrigerating circulator is used to maintain the bath temperature. A small fan ensures satisfactory airflow is maintained across the bath and provides even temperature and humidity conditions throughout the chamber. The dew point and water temperature are measured to an accuracy of 0.1°C using a dew point analyser. Sampling Particular care was required when preparing samples for the apparatus. For each species, a small block of unseasoned material was initially prepared with the approximate dimensions: 13 mm in the tangential (T) direction, 10 mm in the radial (R) direction and 40 mm in the longitudinal direction (L). We sliced the block in the longitudinal direction using a diamond 34 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final reportPDF Image | Evaluation of super-heated steam vacuum drying
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