Development of variable high frequency voltage source for ohmic heating process

Heating is an important step in food processing. A new method of heating uses the natural electrical resistance of the food to generate heat. In this method electrical energy is transformed into thermal energy. This kind of food heating processing operation is called ohmic heating. The rate of ohmic...

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Main Author:	Toudeshki, Arash Mohammadi
Format:	Thesis
Language:	English English
Published:	2010
Subjects:	Heating Electric heating Food industry and trade
Online Access:	http://psasir.upm.edu.my/id/eprint/26670/1/FK%202010%2088R.pdf
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id	my-upm-ir.26670
record_format	uketd_dc
spelling	my-upm-ir.266702013-10-21T01:31:29Z Development of variable high frequency voltage source for ohmic heating process 2010-01 Toudeshki, Arash Mohammadi Heating is an important step in food processing. A new method of heating uses the natural electrical resistance of the food to generate heat. In this method electrical energy is transformed into thermal energy. This kind of food heating processing operation is called ohmic heating. The rate of ohmic heating critically depends on the electrical conductivity of the food during the process. Reviewing a number of researches shows that the usage of direct current for ohmic heating process causes electrolysis in liquid beverages. Moreover, usage of alternating current eliminates the probability of adverse electrochemical reaction. In addition, when the frequency increases, the risk of oxidation in electrodes will decrease. In this regard, for heating different kinds and sizes of food, it is necessary to have an electrical power source with variable output voltage and frequency. This research attempts to design, simulate and fabricate the variable frequency electrical power source to feed an ohmic heating process at high frequency (maximum 10 kHz). The three-phase resistive load is used and the experimental waveforms obtained are compared to simulation results. On the other hand, the total harmonic distortion in input current, power factor, efficiency and power losses of the fabricated system are investigated. Heating Electric heating Food industry and trade 2010-01 Thesis http://psasir.upm.edu.my/id/eprint/26670/ http://psasir.upm.edu.my/id/eprint/26670/1/FK%202010%2088R.pdf application/pdf en public masters Universiti Putra Malaysia Heating Electric heating Food industry and trade Faculty of Engineering English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Heating Electric heating Food industry and trade
spellingShingle	Heating Electric heating Food industry and trade Toudeshki, Arash Mohammadi Development of variable high frequency voltage source for ohmic heating process
description	Heating is an important step in food processing. A new method of heating uses the natural electrical resistance of the food to generate heat. In this method electrical energy is transformed into thermal energy. This kind of food heating processing operation is called ohmic heating. The rate of ohmic heating critically depends on the electrical conductivity of the food during the process. Reviewing a number of researches shows that the usage of direct current for ohmic heating process causes electrolysis in liquid beverages. Moreover, usage of alternating current eliminates the probability of adverse electrochemical reaction. In addition, when the frequency increases, the risk of oxidation in electrodes will decrease. In this regard, for heating different kinds and sizes of food, it is necessary to have an electrical power source with variable output voltage and frequency. This research attempts to design, simulate and fabricate the variable frequency electrical power source to feed an ohmic heating process at high frequency (maximum 10 kHz). The three-phase resistive load is used and the experimental waveforms obtained are compared to simulation results. On the other hand, the total harmonic distortion in input current, power factor, efficiency and power losses of the fabricated system are investigated.
format	Thesis
qualification_level	Master's degree
author	Toudeshki, Arash Mohammadi
author_facet	Toudeshki, Arash Mohammadi
author_sort	Toudeshki, Arash Mohammadi
title	Development of variable high frequency voltage source for ohmic heating process
title_short	Development of variable high frequency voltage source for ohmic heating process
title_full	Development of variable high frequency voltage source for ohmic heating process
title_fullStr	Development of variable high frequency voltage source for ohmic heating process
title_full_unstemmed	Development of variable high frequency voltage source for ohmic heating process
title_sort	development of variable high frequency voltage source for ohmic heating process
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	2010
url	http://psasir.upm.edu.my/id/eprint/26670/1/FK%202010%2088R.pdf
_version_	1747811550128766976

Development of variable high frequency voltage source for ohmic heating process

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