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The authors have developed electric regulators: relay-pulse ones, with solid filler and electric heater, with solid filler and thermoelectric module, for a heat exchanger to obtain the energy of the water-ice phase transition. Experimental studies were carried out, the static and dynamic characteristics of electrical controllers were determined to determine the most fast-acting regulator. They substantiated that after the use of the thermoelectric module, the regulator operation is ensured during potato storage heating and cooling. Moreover, when they change the potato storage operating modes by changing the polarity of the thermoelectric module, the speed of the regulatory body is ensured. The heating efficiency of the solid-filled electrical regulator and thermoelectric module is higher than of electrical regulator with solidfilled electrical controller and electric heater.
Various energy-saving technologies using renewable energy sources [1, 2, 3, 4], electro-hydraulic effect , microwave technologies [6, 7, 8, 9] are used for agricultural facilities. The analysis of the literature data has shown the feasibility of water-ice phase transition energy use . They developed the heat exchanger of the experimental unit, by which they maintain the necessary temperature parameters of the vegetable storage. They determined the theoretical parameters of the modernized electric regulators, which make it possible to maintain the required microclimate parameters of the vegetable storehouse through the distribution of the energy carrier to the condenser and to the additional evaporator of the heat exchanger.
1. Upgraded electric regulators allow to maintain the microclimate of the vegetable storehouse through the distribution of an energy carrier to a condenser and to an additional evaporator of a heat exchanger. 2. The static characteristics of the upgraded electrical regulators determined the working temperature of the solid filler: the minimum (50-60 °C) – with an electric heater, and the maximum (70-80 °C) – with a thermoelectric module. 3. Using the dynamic characteristics of the modernized regulators their performance was compared. In the heating mode, the delay time of regulator valve opening with a thermoelectric module makes 8 seconds, with an electric heater – 9 seconds, of industrial thermostat (basic) – 12 seconds, of the regulator without a heating element – 13 seconds. In cooling mode, the closing time of the regulator valve closure with the thermoelectric module makes 5 s., of the regulator without a heating element – 13 s., of the regulator with an electric heater – 11 s. 4. The heating efficiency of a solid-filled electrical regulator and a thermoelectric module is higher than the solid-filled electrical regulator with electric heater.
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