เอื้ออารี ถมค้าพาณิชย์. Study of Intermittent Low-Pressure Superheated Steam and Vacuum Drying of Banana. Master's Degree(Food Engineering). King Mongkut's University of Technology Thonburi. : King Mongkut's University of Technology Thonburi, 2005.
Study of Intermittent Low-Pressure Superheated Steam and Vacuum Drying of Banana
Abstract:
In this study the effects of different drying methods (low-pressure superheated steam drying (LPSSD)
and vacuum drying), intermittent drying schemes in terms of temperature and pressure and tempering period or
on/off-time of an electric heater, steam flow and vacuum pump at several setting temperatures (70?C, 80?C and 90?C)
on the drying kinetics and several quality parameters viz. color, texture, shrinkage and ascorbic acid retention of banana
chips were investigated experimentally. In terms of the drying kinetics the drying temperature was found to have an effect
on the drying rates of samples dried both in the cases of LPSSD and vacuum drying. It was found that intermittent temperature
LPSSD could increase the moisture reduction rates of samples. Intermittent temperature vacuum drying, however, took
longer time than continuous vacuum drying. Nevertheless, the effective or net drying time was significantly shorter than that
of continuous drying leading to high energy saving. In the cases of intermittent pressure drying it was observed that the drying
rates both in the cases of intermittent pressure LPSSD and vacuum drying were higher than those in the cases of continuous
LPSSD and vacuum drying. The effective or net drying time was again shorter than those of continuous drying. This could save
the energy consumption of the processes.