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Table 66. Shrinkage data measured and published per species (IP: intersection point (%) (Budgen 1981), Total shrinkage and shrinkage at 12 % MC (Bootle 2005)) Shrinkage at Measured 12 % MC Published R T R/T 4.5 6.0 0.75 5.0 7.5 0.67 4.0 7.0 0.57 3.5 6.5 0.54 Intersection point (%) Total shrinkage (%) Measured Published RTRT RT 23.2 27.5 21.4 24.5 23.4 23.7 8.6 7.2 8.7 8.1 28.3 33.9 28.6 38.1 -- 8.3 12.2 8.0 12.9 24.6 26.7 25.1 31.2 24.4 29.2 8.5 14.3 8.6 12.4 28.0 31.3 28.1 33.5 -- 9.041 12.31 8.036 11.7 Sample # 1 2 1 2 1 2 1 2 Species C. citriodora C. citriodora E. marginata E. marginata E. pilularis E. pilularis E. obliqua E. obliqua R T 4.2 4.1 4.2 4.0 1.06 R/T 1.02 4.8 7.9 4.7 8.9 0.53 0.60 By observing the MC versus RH sorption/desorption curves for each species, the hysteresis phenomenon is evident (Figure 70). The curves differ for each species due to different anatomical and chemical make up. The reducing RH/MC part of the curve (top part) is the desorption curve and is more applicable to wood drying which is a desorption process. Using data from this part of the curve, the desorption isotherm was calculated for each species by solving equation (53) using Matlab. Constants C1 and C2 were generated and are presented in Table 67. 4.4 7.9 4.4 7.3 0.60 0.55 5.2 7.6 4.6 7.5 0.61 0.68 E. obliqua E. pilularis E. marginata C. citriodora 27 21 15 9 3 20 40 60 80 Relative humidity (%) Figure 70. MC versus RH curves for each species showing sorption hysteresis Table 67. Sorption isotherm equation solutions Species E. obliqua E. marginata E.pilularis C. citriodora Sorption isotherm constants C1 C2 0.808 2.2796 0.9716 0.8401 1.1847 0.7211 1.0047 0.9076 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report 105 Moisture content (%)PDF Image | Evaluation of super-heated steam vacuum drying
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