Thermal Diffusivity, Moisture Diffusivity, and Color Change of Codonopsis javanica with the Support of the Ultrasound for Drying

Figure 1

The experiment setup of the drying process. (a) The drying system using a heat pump method and ultrasound. (b) The position of the material in the drying chamber and its two points of temperature measurement (A and B). (1) Drying fan; (2) evaporator; (3.1), (3.2) condenser; (4) compressor; (5) auxiliary air heater; (6) temperature and humidity sensors; (7) valve; (8) ultrasonic transducer; (9), (11) trays for samples; (10) drying chamber with ultrasound; (12) drying chamber without ultrasound; (13) high-power ultrasonic generator; (14), (15) electronic weight scale; (16) unit controller; (17) computer.

(a)

(b)