Development of a Microwave System for Highly-Efficient Drying of Fish

Yuttapong PIANROJ; Pansak KERDTHONGMEE; Mudtorlep NISOA; Priwan KERDTHONGMEE; Jirapong GALAKARN

Authors

Yuttapong PIANROJ Molecular Technology Research Unit, School of Science, Walailak University, Thasala, Nakhon Si Thammarat 80161
Pansak KERDTHONGMEE Molecular Technology Research Unit, School of Science, Walailak University, Thasala, Nakhon Si Thammarat 80161
Mudtorlep NISOA Molecular Technology Research Unit, School of Science, Walailak University, Thasala, Nakhon Si Thammarat 80161
Priwan KERDTHONGMEE Center for Scientific and Technological Equipment, Walailak University, Nakhon Si Thammarat 80161
Jirapong GALAKARN Center for Scientific and Technological Equipment, Walailak University, Nakhon Si Thammarat 80161

Keywords:

Drying technology, electromagnetic waves, microwaves, magnetron, high-voltage, dielectric heating, fish

Abstract

Dried fish is an important product of Nakhon Si Thammarat province, located in southern Thailand. Fish are conventionally dried using heat from the sun or heat from burning wood as energy sources. These drying methods have problems such as low efficiency and environmental problems. Exploiting the strong electric dipole of the water molecules in the fish, which allows the fish to absorb microwave energy effectively, we have developed a novel microwave heating system for the efficient drying of fish. The system utilizes a high-voltage power supply so that the magnetron can generate a microwave field continuously, and its output power can be adjusted from 0 - 200 W making it very different to commercial microwave oven. The waveguide is designed for effective transmission of microwave fields into the multi-mode heating cavity. The experimental results reveal that heat produced by the microwave system causes evaporation of moisture from the fish making it possible to produce high quality dried fish. The drying process also shows a dependence of fish surface temperature and moisture content on the radiation time and microwave power.

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References

ET Thostenson and TW Chou. Microwave processing: fundamentals and applications. Composites: Part A 1999; 30, 1055-71.

JM Osepchuk. Microwave power applications. IEEE Trans. Microwave Theory Tech. 2002; 50, 975-85.

C Gabriel, S Garbiel, EH Grant, BSJ Halstead and DMP Mingos. Dielectric parameters relevant to microwave dielectric heating, Chem. Soc. Rev. 1988; 27, 213-23.

DM Pozar. Microwave Engineering, 2nd ed., John Wiley&Sons Inc., New York, 1998, p. 5-25.

Y Wang and D Timothy. Dielectric properties of foods relevant to RF and microwave pasteurization and sterilization. J. Food Eng. 2003; 57, 258-68.

AK Datta, E Sun and A Solis. Food Dielectric Property Data and Their Composition-Based Prediction: Engineering Properties of Foods. Marcel Dekker Inc., New York, 1995, p. 457-94.