The article considers the issue of increasing the efficiency of coolers of the material heated during drying by using a heat pump unit to produce artificial cold. The scheme of use of a thermal pump in a complex with the drying installation and the portable cooler of material is offered. A mathematical description of the stationary modes of operation of the drying unit, material cooler and heat pump elements on the basis of a steam compressor refrigeration unit is formulated. At creation of physical and mathematical models of heat and mass transfer in the course of drying and cooling of material (grain) the following conditions are accepted simplifying the mathematical description, but without changing real process: moisture from the material is removed according to Dalton's evaporation law, while the moisture in the material evaporates and is removed simultaneously; moisture content and temperature in the volume of the material are evenly distributed, heat and mass transfer occurs only between the surface of the material and the drying agent; the effects of radiation and contact heat transfer are taken into account by heat transfer coefficients; stationary fields of temperature and moisture content are assumed to be one-dimensional, which vary according to the coordinate calculated in the direction of movement of the material; when cooling the moisture removal material is not taken into account for low residual moisture; the size of the surface of the material in the process of drying and cooling does not change; the heat exchange equipment of the heat pump is an object with concentrated parameters. Using the obtained mathematical dependences, graphical dependences of changes in grain and air temperature are constructed, which allow to evaluate the expediency of using a heat pump. The formulated mathematical model of stationary modes of the heat pump drying unit with artificial cooling of the dried material can be used to evaluate the feasibility and energy efficiency of the used refrigeration machines for grain cooling, especially after high-temperature processing. The obtained analytical dependences in the form of a closed system of equations can be used to optimize the parameters of the heat pump drying unit by the criterion of minimizing energy consumption.

Modern milking machines need some additional studies to meet the requirements as to milking equipment. An imperfect design of a teatcup results in an incomplete milking of cows. The availability of devices for milk flow stimulation promotes an increase in a cow milk yielding capacity. But here arises a problem of an un-controlled axial motion of a teatcup on a teat. As a result, a full milkflow is reduced, particularly at the final stages of milking. There is an effect of an increase in an inner diameter of a liner barrel, which causes that teatcups fall down. A scientific problem of the mitigation of some negative developments with the view to improve the efficiency of a teatcup arises. In a teatcup shell a liner is in a detended position during milking and resting periods. Thus, it under constant stretching. It results in a loss of elasticity irrespective of the material, as well as in reduction ofthe period of service maintenance. The use of a device for supporting a liner which is in a stretched state only during the milkflow, will result in an increase of a teatcup efficiency. The suggested automatic pneumatic mechanism releases a liner from the load during the resting period. The dependence of a tension force of a liner from the surface area of an annular membrane has been established. It has been proven that the membrane surface of 0.00065 m2 provides tension for a mechanism performance irrespective of operating vacuum pressure. The regression equation which connects geometrical parameters of an operating system with the efforts directed at the opening of a leading membrane has been received. A suitability of operation of using a pneumatic tightening device has been substantiated. An insignificant axial motion of a liner during a cycle of milking creates a stimulating effect. As a result, a completeness of miliking increases by 3-8%.

Подано результати впровадження інформаційно-комунікаційних технологій у навчальний процес, що відповідає реаліям сьогодення. Метою роботи стало розроблення спрощеної методики реєстрації керівниками та адміністраторами в інформаційному середовищі Moodle версія 2.7 здобувачів освіти професійно-технічних навчальних закладів для дистанційного навчання. Дослідження проводилось в умовах навчального процесу під час різкого запровадження дистанційного навчання при карантинних заходах та змішаного в умовах теперішнього часу для здобувачів освіти професійно-технічних навчальних закладів. Стаціонарне навчання здобувачів освіти під час карантинних заходів різко перейшло у дистанційне, але питання виробничого навчання залишалося актуальним, тому у теперішній час потрібно виробити методику змішаного навчання. Це дає можливість переосмислити принципи побудови навчальних курсів і є основним напрямком на найближчу перспективу. Дослідженнями встановлено, що обраний метод переходу теоретичних курсів на дистанційну форму навчання в інформаційному середовищі Moodle найбільш прийнятний з точки зору простоти реалізації і впровадження.Результатом проведеного дослідження стала запропонована методика спрощеної реєстрації здобувачів освіти в інформаційному середовищі Moodle версія 2.7 на основі уже наявних баз даних здобувачів освіти, яка показала свою ефективність при забезпеченні доступу до навчальних курсів у стислі строки. Встановлено, що відповідне програмне забезпечення сприяє генерації тимчасових реєстраційних даних і формуванню глобальних груп здобувачів освіти. Це виражається в покращенні як якісних, так і кількісних результатів при дистанційному навчанні, а також самоконтролі та контролі засвоєння знань здобувачами освіти професійно-технічних навчальних закладів. Ключові слова: здобувач освіти, Moodle, методика реєстрації, дистанційне навчання, інформаційне середовище. ПРОФЕСІЙНА ОСВІТАThe result of the study was the proposed method for simplified registration of applicants for education in the information environment Moodle version 2.7 based on existing databases of applicants, which has shown its effectiveness in providing access to training courses in a short time. It has been established that the corresponding software contributes to the generation of temporary registration data and the formation of global groups of applicants for education. This is expressed in improving both qualitative and quantitative results in distance learning, as well as for self-control and control of the assimilation of knowledge by applicants for education in vocational schools.

Purpose. Improving the quality of temperature control of a heat generating installation for air heating. Methods. The specificity of the issue under consideration determines the analytical method of research by formulating a mathematical model of the non-stationary thermal regime of the heat generator and calculating the parameters of the temperature controller based on fuzzy logic. Results. Analysis of the thermal effects of a heat generator with a heat exchanger, a physical model is determined and, on its basis, a mathematical model of non-stationary heat transfer in the elements of the heat generator design is formulated. The model is presented in the form of three partial differential equations. An approximate solution of the system of equations and generalized simplifications made it possible to determine the dynamic model by means of first-order aperiodic transfer functions with delay. Based on the identified model coefficients, a fuzzy controller rule base and an automatic temperature control system were created in two versions: with a typical PID controller and a fuzzy temperature controller. The analysis of transient processes of regulation of the automatic temperature control system was carried out. Conclusions. An analysis of the characteristics of the transient process of the automatic temperature control system revealed that the control time of a system with a fuzzy controller is less than in a system with a typical PID controller. Therefore, a fuzzy air temperature control system in a heat generator can be used to automate a significant class of heat generating devices. Keywords: heat generator, fuzzy controller, dynamic mode, mathematical model, production room.

Annotation Purpose. Formulation of a mathematical description of the non-stationary thermal regime of the heat utilization system of ventilation emissions on the basis of a heat exchanger with an intermediate heat carrier for industrial premises. Methods. The specificity of the object under study determines the analytical method of research, which is based on the analysis of the thermal balance of the elements of the studied system and the heat and energy connections between them. Results. A mathematical description of the dynamics of the thermal process in a recuperative heat recovery unit with an intermediate heat carrier is formulated taking into account the variable parameters of ventilation air, both exhaust and supply air and the presence of condensation on the surface of the heat exchanger. Given the possibility of automatic control of the operation of the disposal system by changing the flow of intermediate coolant (which makes the system of equations nonlinear), a linearized mathematical model of the dynamics of the studied system is proposed. Conclusions 1. The obtained mathematical models allow to determine the dynamic characteristics of the system of waste heat utilization in transient modes, as well as to evaluate the efficiency of the system itself and to optimize the parameters of heat exchangers. 2. The linearized model of the thermal utilizer allows to synthesize the system of automatic control of the operating mode and to investigate its parameters. Keywords: waste heat utilization, heat exchanger recuperator, intermediate heat carrier, dynamic mode, mathematical model, production room.