DEVELOPMENT OF THE INFORMATION AND MEASUREMENT SYSTEM OF CONTROLLING THE MICRO-CLIMATE OF THERMAL ROOMS

Abstract

The important issue of increasing the efficiency and process optimization of growing crops, greenhouses in particular, is considered. The urgency of information-measuring system (IMS) development for controlling the microclimate of greenhouses is substantiated. There was held the analysis of the main microclimate parameters in greenhouses, which contribute to the intensification of plant growth, as well as to increasing the efficiency of growing crops in general. The analysis showed that the main information parameters of the greenhouses microclimate are: soil temperature, soil moisture, air temperature, humidity, light in the greenhouse. It is the measurement and control of these parameters that should be the basis for IMS development which is aimed to control of the microclimate of greenhouses. The main tasks that the developed IMS should perform and its functional scheme are formulated. The principle of IMS work is described in the article. The main elements of the IMS are selected, namely microprocessor, display, sensors for measuring soil temperature, soil moisture, air temperature, air humidity and light of a greenhouse. The diagram of sensors location in the greenhouse for optimal control of the basic microclimate parameters is presented. The electrical circuit diagram of the IMS is developed and the connection features of the sensors are described. Basing on functional and electrical schematic diagrams, a working model of the IMS for microclimate control of the greenhouses was constructed. In order to confirm the performance, a test of developed IMS was performed. There were tested three series of measurements of each parameter during the day. Also, metrological analysis of the developed IMS was performed and the measurement uncertainty of each parameter result was calculated.