The Study of Plate Heat Exchanger Thermal Inertial  Properties as Object of Control in Closed-Loop Radiator  Heating System

Kutsenko, O.; Tovazhnyanskyy, Vladimir; Perevertaylenko, O.; Kapustenko, Petro; Ved, Viktor; Yuzbasyan, A.

doi:10.20998/2078-5364.2020.4.02

Cited by 2 publications

(2 citation statements)

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“…From the obtained data, it follows that the maximum heat transfer corresponds to a laminar turbulent transition (LTT) in a long pipe. For this mode, it is established that LTT is implemented in accordance with the discontinuity scenario, that is, when areas with laminar flow alternate with areas with turbulent flow (turbulent spots -torqueing) (Kutsenko et al, 2020). This process is illustrated in Figure 3 on the example of propagation a free flow of water (d = 3 mm, Re = 2,850).…”

Section: Resultsmentioning

confidence: 99%

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Derkach,

Stadnyk,

Piddubnyi

et al. 2024

Tehnìka ta energetika

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The relevance of the study is determined by its focus on one of the key problems of the Ukrainian economy, namely the problem of energy resources, which is a necessary step in the development of resource management and planning strategies in the context of modern challenges and instability in the energy market. The purpose of the study is to determine the hydrodynamic and mass-heat transfer characteristics of the process of mixing liquids with different thermal potentials, and to investigate the influence of design factors on the intensity and efficiency of the flow jet. Experimental methods were used to specify the hydrodynamic and mass-heat transfer parameters of the liquid mixing process, and modelling was used to analyse the influence of design factors and develop a scientifically based methodology for calculating new device designs. An approach is obtained that allows solving two problems simultaneously: to decrease energy costs through their rational operation and to reduce environmental pollution, avoiding harmful emissions that occur during fuel combustion. The functional scheme of the test stand is described, the research methodology is presented, and statistical modelling of the influence of parameters on the length of the liquid jet is carried out. Studies of the energy efficiency of the initial stage of the interaction of thermal potentials during the generation of a liquid jet in a recuperative heat exchanger of mixed action to ensure storage conditions and potential movement in front of the nozzle are presented. A mathematical model for describing the length of a continuous water jet when flowing out of the nozzle is proposed and an analysis of the laminar flow of liquid from the nozzle is performed. The length of the continuous water jet when flowing out of the nozzle is determined and the technical capabilities of the process are identified. The efficiency of installing the tip in front of the nozzle for creating turbulent mixing and the method of controlling the water supply during the mixing of thermal potentials are determined. To control the water supply process, a step-by-step method has been developed that allows gradually increasing or decreasing the length of a continuous water jet through the nozzle. The results of the study provide an opportunity to optimise heat exchangers and mixing machines to increase their efficiency and productivity

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Section: Resultsmentioning

confidence: 99%

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Derkach,

Stadnyk,

Piddubnyi

et al. 2024

Tehnìka ta energetika

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Section: Resultsmentioning

confidence: 99%

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2024

Tehnìka ta energetika

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The relevance of the study is to develop an effective system for controlling the pressure in the air supply in motorised breathing apparatus to ensure effective protection of employees from dangerous aerosols and improve their health. The goal was to create an automated air pressure control system in a motorised breathing apparatus using a proportional-integral-derivative controller. For this purpose, the simulation method was used. In order to avoid unforeseen situations of deterioration of the level of protection, the structure of the pressure control system of a motorised respirator has been developed with the selection of the appropriate controller based on the obtained dependences of the influence of the parameters of the breathing mode and the amount of pressure in the under-mask space of the respirator, which ensures an appropriate comfortable mode of operation. This allowed developing a simulation model with a PID controller that would provide the appropriate pressure values within the permissible limits (50-370 Pa). It is proved that the proportional-integral-derivative controller maintains the pressure in the respirator mask within certain limits both with an increase and with a decrease in the control signal, preventing excessive fluctuations in the controlling variable, which leads to an extension of the service life of the filter elements and a reduction in electricity consumption for the operation of the fan motor. Based on modelling the operation of the pressure control system in different modes of operation, it is shown that when using a PID controller with defined parameters, the system provides compensation for changes in air

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The Study of Plate Heat Exchanger Thermal Inertial Properties as Object of Control in Closed-Loop Radiator Heating System

Cited by 2 publications

References 1 publication

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

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