Design of an Ohmic Heating Rate Control System for Food Processing
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Abstract:
Heating rate has a great influence on food quality, ohmic heating provides a new heating method for food processing. However, the control of the heating rate has been considered as the difficulty in food industry for the constant voltage control applied in current ohmic heating systems. In this study, an ohmic heating rate control system was designed based on single chip microcomputer (SCM), including a single chip microcomputer, a voltage regulator circuit, a data acquisition circuit, function keys, a LCD screen and a heating cell. The system could not only set the heating rate, but also give a real-time monitoring to the temperature change during the heating process. Compound control method was adopted to maintain the heating rate at the setting value during heating. Afterwards, the system was tested by heating milk. The result showed a good linear relationship between the temperature of milk and time when setting the heating rate of 6 ℃/min, 8 ℃/min, 10 ℃/min and 12 ℃/min respectively, and the relative error between actual heating rate and setting value was 0.50~3.83%. The study can provide a reference for the control of heating rate in the ohmic heating process.
