This article presents the results of the simulation of an automatic control system for the heat supply of a greenhouse complex with a geothermal heat source, conducted in order to study the possibility of geothermal heat supply system automation. Scilab version 6.1 was used for simulation. Based on the results of the simulation, the optimal mode of the automation system function of the heat exchanger primary circuit was developed and implemented. Reagentless treatment of geothermal water in the heat supply system with an acoustic–magnetic device (designed and patented by the authors of this paper) can significantly reduce the intensity of scale formation in the heat exchanger and geothermal heat supply system equipment. It provides conditions for the automation of geothermal heat supply systems of greenhouses with a surface heat exchanger. Using an automation system allows greater accuracy and reliability in maintaining the required temperature regime (18–20 °C) in the greenhouse, reduces the frequency of system shutdown for unplanned cleaning of the heat exchanger and equipment, reduces the complexity of manual operations of heat exchanger and equipment maintenance (removal of sludge, scale) and reduces the economic costs of transportation and heat consumption.
The paper presents the research results of the mutual influence of pulse voltage, magnetic field strength gradient, and thermal regime for the energy consumption of an acoustic magnetic device. To carry out the research, a hypothesis has been put forward on the possibility of increasing the energy efficiency of the acoustic magnetic device due to the joint solution of three problems: electric, magnetic and thermal. For the experimental study of the hypothesis, a model of an acoustic-magnetic device was developed using the ELCUT 6.1 software. In the process of modelling a geometric model was created, the physical properties of the model blocks, electrical circuit were established. The laws for distribution of temperature both inside and on the surface of the device under long-term operating conditions, since incomplete use of heating possibilities leads to a lowpower electromagnetic field and to deterioration of magnetic processing, and overheating leads to destruction of interlayer insulation and turn-to-turn short circuit. The value of the temperature inside the pipeline through which the processed substance passes, since in the acoustic magnetic treatment of certain substances the temperature limits are strictly set, non-observance of which leads to unsatisfactory results. The obtained results show the possibility of reducing the power consumption of the acoustic magnetic device due to the use of pulse voltage of the meander type, ferrite ring as a radiator and magnetic circuit, and also a special material of the acoustic magnetic device body.
There is a problem of installation of acoustic-magnetic devices at pipes of various diameters, when planned routine pipe replacement work is carried out in greenhouse geothermal heating systems. This technical problem determines a scientific problem of finding acoustic-magnetic devices characteristics, which allow to change only the acoustic-magnetic device internal diameter, if transition to different pipe diameter is needed. To solve this problem, a hypothesis was put forward about the possibility of finding the extremes of the function of water treated with physical field salts separation process. For the hypothesis of the experimental study an acoustic-magnetic model of the device was studied. This model represents the relationship between the following factors: the size of the ring, the inner diameter of the pipe, similarity coefficients, and the resulting variable -the antiscale effect. It was decided to study the optimum region by screening out insignificant factors and building a plan for the 2 nd complete factor experiment. After translating significant similarity coefficients into natural values and analyzing the physical quantities dimensions, physical regularities of phenomena were revealed by means of functional dependencies between the quantities. When implementing the planning matrix, an inadequate model was obtained. Using the steep ascent method, it was not possible to obtain the optimization parameters, so it was decided to build a second order orthogonal plan to describe the optimum area. The second order regression equation turned out to be adequate. Its extremum was found. To verify the obtained global maximum values of the geothermal water acoustic-magnetic treatment process, the function value was calculated from the model. The results allowed to obtain the optimal efficiency of preventing scale formation on the greenhouse complex geothermal heating system pipes of various diameters by the optimal characteristics of the acoustic-magnetic devices.
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