Satureja Bachtiarica Case Study
Extracting the hot air drying kinetics model
In the hot air drying, moisture ratio at three temperatures of 40, 50 and 60°C was obtained and fitted with the existing models in Table 1. Table 2 shows the coefficients and statistical indicators related to these models in the hot air drying method. The Page and modified Page models better than other ones predict moisture ratio based on the temperature of the dryer and the drying time. Values of R2, χ2 and RMSE for the two models in the hot air drying method were 0.9988, 0.0087, 0.0094, respectively. In addition, in a study, Arab-Hosseini and Hakaran (2009) investigated the drying kinetics of the leaves and the whole plant of Tarragon. The results showed that in the temperature range of 40-90°C …show more content…
As can be seen, the general procedure of changes in different drying methods is that the lowest percentage of essential oils is associated with a temperature of 60°C in the hot air, infrared and ultrasound methods, and while the highest essential oil content is related to the ultrasound method at 40°C. Therefore, according to the results of the research, using the high temperatures in the hot air, infrared and ultrasound dryers gives rise to reducing the yields of essential oils of the valuable medicinal plant. These results are in line with those of other researchers. The results of Fathi and Sefidkon's study (2012) based on the statistical analysis of the yields of essential oils of Eucalyptus showed that the least amount of essential oils was associated with the dried sample in an oven at 50°C (2.30%). Moreover, the results of Hameruni-Salami' study (2011) based on the effect of drying on the yields of essential oils of laurel tree showed that increasing a temperature in the infrared method from 45°C to 65°C reduced the amount of essential oils. However, the low temperature in the ultrasonic dryer compared with the hot air and infrared drying methods gives rise to accelerating the drying process. In addition, there is statistically significant differences in the amount of essential oils obtained from the hot air and infrared drying
In the hot air drying, moisture ratio at three temperatures of 40, 50 and 60°C was obtained and fitted with the existing models in Table 1. Table 2 shows the coefficients and statistical indicators related to these models in the hot air drying method. The Page and modified Page models better than other ones predict moisture ratio based on the temperature of the dryer and the drying time. Values of R2, χ2 and RMSE for the two models in the hot air drying method were 0.9988, 0.0087, 0.0094, respectively. In addition, in a study, Arab-Hosseini and Hakaran (2009) investigated the drying kinetics of the leaves and the whole plant of Tarragon. The results showed that in the temperature range of 40-90°C …show more content…
As can be seen, the general procedure of changes in different drying methods is that the lowest percentage of essential oils is associated with a temperature of 60°C in the hot air, infrared and ultrasound methods, and while the highest essential oil content is related to the ultrasound method at 40°C. Therefore, according to the results of the research, using the high temperatures in the hot air, infrared and ultrasound dryers gives rise to reducing the yields of essential oils of the valuable medicinal plant. These results are in line with those of other researchers. The results of Fathi and Sefidkon's study (2012) based on the statistical analysis of the yields of essential oils of Eucalyptus showed that the least amount of essential oils was associated with the dried sample in an oven at 50°C (2.30%). Moreover, the results of Hameruni-Salami' study (2011) based on the effect of drying on the yields of essential oils of laurel tree showed that increasing a temperature in the infrared method from 45°C to 65°C reduced the amount of essential oils. However, the low temperature in the ultrasonic dryer compared with the hot air and infrared drying methods gives rise to accelerating the drying process. In addition, there is statistically significant differences in the amount of essential oils obtained from the hot air and infrared drying