Method of thermoeconomical optimization of energy intensive systems with linear structure on graphs

Wu, Chong; Nikulshin, Vladimir

doi:10.1002/1099-114x(20000610)24:7<615::aid-er608>3.3.co;2-g

Cited by 8 publications

(13 citation statements)

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“…The above is important in accordance with the tasks of energy saving technologies, as it leads to a decrease in the maximum power of the system, which is dedined by the level of energy needs and the duration of a heating-up regime [20].…”

Section: Results Of Numerical Simulationmentioning

confidence: 99%

Construction of methods to improve operational efficiency of an intermittent heat supply system by determining conditions to employ a standby heating mode

Мазуренко

Denysova

Balasanian

et al. 2018

EEJET

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В ходi дослiдження було визначено умови рацiонального використання переривчастого теплопостачання для будiвель громадського призначення рiзних типiв: адмiнiстративнi та навчальнi заклади та iншi будинки громадського призначення. Вiдомi результати теоретичних та експериментальних дослiджень не враховують динамiку остигання будiвлi та доцiльнiсть використання чергового режиму опалення. А це вкрай важливо для моделi управлiння системою теплопостачання. Проведено математичне моделювання змiни температури в примiщеннi для рiзних типiв будiвель при змiнних клiматичних параметрах, рiвня термомодернiзацiї та експлуатацiйних параметрiв будiвель, що визначає доцiльнiсть використання чергового режиму. Вiдмова вiд чергового режиму дозволяє досягти додаткового енергозберiгаючого ефекту. Показано вплив огороджувальних конструкцiй будiвель на динамiку нагрiву та остигання примiщень при змiнних клiматичних умовах для рiзних режимiв експлуатацiї. Запропоновано математичну модель основних режимiв роботи при використаннi переривчастого теплопостачання. Структура математичної моделi складається з двох iнерцiйних ланок: мало iнерцiйної та високоiнерцiйної. Перша ланка вiдображає процес нагрiву повiтря в примiщеннi. Друга ланка вiдображає процес нагрiву огороджувальних конструкцiй примiщення. Параметрами запропонованої моделi є коефiцiєнти передачi об'єкта по каналу «потужнiсть нагрiву-змiна температури повiтря», а також постiйнi часу для кожної iз ланок. Вхiдними змiнними для даної моделi є температура навколишнього середовища та режим експлуатацiї примiщень (час перемикання з режиму на режим). Вихiдною змiною є температура в примiщеннi вiдповiдно до дiючого режиму. Визначено крайовi умови застосування чергового режиму роботи системи переривчастого опалення для рiзних типiв будiвель при рiзних ступенях термомодернiзацiї. Результати дослiдження можуть бути використаннi при проектування нових будiвель громадського призначення та реконструкцiї систем теплопостачання iснуючих адмiнiстративних та навчальних закладiв. При цьому необхiдно враховувати ступiнь термомодернiзацiї будiвлi, тип систем опалення та режими експлуатацiї Ключовi слова: система переривчастого теплопостачання, форсування режиму, черговий режим, запас потужностi, акумулятор теплоти

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Section: Results Of Numerical Simulationmentioning

confidence: 99%

Construction of methods to improve operational efficiency of an intermittent heat supply system by determining conditions to employ a standby heating mode

Мазуренко

Denysova

Balasanian

et al. 2018

EEJET

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“…In equations (15) and (16), the determining factors are the exponent n and the coefficient of averaging of the heat flux k. In the Semikin thermal diagram method, their value is determined only for the case of heating the material outside. Therefore, for the case of heating from the inside, a numerical simulation of the nozzle heating over the cross section was performed using a specialized software package that uses well-known methods for the numerical solution of unsteady heat conduction problems [13][14][15]. As a result, for the first time, dependence has been established for determining the averaging coefficient of the heat flux k for the case of heating from inside the cylindrical nozzle layer under boundary conditions of the second kind.…”

Section: Energy Sciencementioning

confidence: 99%

Theoretical and Experimental Investigation of the Efficiency of the Use of Heat-Accumulating Material for Heat Supply Systems

Klymchuk

Denysova

Shramenko

et al. 2019

EUREKA: Physics and Engineering

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As a result of research, the conditions for the effective use of the volume of heat accumulator based on solid materials were determined. In the course of research, various schemes of the device of tubular heating elements for charging the channel elements of the heat accumulator were considered. Fire clay was used as a heat-accumulating material, capable of operating in a wide temperature range (up to 600 °С). Mathematical modeling of temperature change in the process of discharge over the cross section of the heat-accumulating unit has been carried out. Mathematical modeling was carried out using an application package that allows to obtain the temperature distribution over the cross section of the heat accumulator at key points of its work. The obtained simulation results were tested on an experimental setup consisting of four heat-accumulating units during the charging process and during the discharge of the heat accumulator. According to the research results, the most effective layout of the heating elements was determined, which allows to make the most of the volume of the heat-accumulating material. The dependencies to determine the exponent and the averaging coefficient of the heat flux are also found, which allow a more rational use of the volume of the accumulating nozzle. The research results can be used to reconstruct decentralized heat supply systems for both residential buildings and public buildings. This will significantly align the schedule of electricity consumption during the day and reduce the consumption of hydrocarbon fuels.

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“…An assessment of values of the objective function of a problem can be performed from the bottom and from the top and dynamically assess the possibility of diversifying the basis optimal variable with guaranteed accuracy [12]. In paper [13], the method of thermoeconomic optimization of power consuming systems with the linear structure on the graphs was developed. Analysis of solutions' stability in the problems of detecting duplicates in electronic documents was presented in research [14].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In the studies, published by different authors, it is emphasized that one of the unresolved components of the general problem of development of effective models is the stage of obtaining a solution to systems of equations of mathematical description of complex systems [8]. In this case, the methods for solution simplification through introduction of specific constraints [9], transition to iterative search for a solution [11], the use of the decomposition of objects with representation of systems using graphs [13] have become widely used. These solution simplification options are based on the additional transformation of the mathematical description of systems with construction of unique algorithms for obtaining the solution to a problem [15].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Algorithm for the simplification of solution to discrete optimization problems

Chernov

Titov

Chernova

et al. 2018

EEJET

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Method of thermoeconomical optimization of energy intensive systems with linear structure on graphs

Cited by 8 publications

References 0 publications

Construction of methods to improve operational efficiency of an intermittent heat supply system by determining conditions to employ a standby heating mode

Construction of methods to improve operational efficiency of an intermittent heat supply system by determining conditions to employ a standby heating mode

Theoretical and Experimental Investigation of the Efficiency of the Use of Heat-Accumulating Material for Heat Supply Systems

Algorithm for the simplification of solution to discrete optimization problems

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