Development of a soil regenerator with a granular nozzle for greenhouses

Boshkova, Irina; Volgusheva, Natalya; Solodka, Antonina; Mukminov, Ihor; Bondarenko, Oksana

doi:10.15587/1729-4061.2020.210684

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Of interest are regenerators, where a dense layer of granular (loose) materials is used as an accumulating body [3]. The intensity of heat transfer increases significantly due to the developed heat transfer surface, which is the total surface of all particles in the apparatus [4]. Similar regen-…”

Section: Problem Descriptionmentioning

confidence: 99%

Experimental study of a pilot unit of a ground regenerator for greenhouses

Mukminov

Volgusheva

Georgiesh

et al. 2022

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The object of research: the process of heat exchange in a packing in the form of a dense layer of crushed stone as part of a thermal regenerator designed to utilize the low-grade heat of the air in a greenhouse. Investigated problem: increasing the efficiency of air heat accumulation in the greenhouse during the daytime by a regenerative heat exchanger with a granular packing. Conducting experimental tests of regenerator models with a packing in the form of a dense layer of granular material under natural conditions is necessary to improve the design and optimize technological parameters. The main scientific results: the analysis of temperature curves of air changes at the inlet and outlet of the regenerator installed in the mock-up greenhouse with a volume of 0.25 m3, and the packing material was carried out. During the heating period of the nozzle, the accumulated heat was Q=8•104 J, which can be used when the temperature in the greenhouse decreases. During the pause, the loss from the heat exchange channel to the environment is 48,000 J. The duration of the period was 358 min, while the average heat flux corresponded to 2.2 W. Heat losses during the pause period are significant due to its duration, however, the average heat transfer coefficient has a low value of k=2.3 W/m2K, so strengthening the insulation of the heat exchange channel is irrational. The area of practical use of the results of the study: greenhouses, allowing the possibility of installing additional heat exchange equipment. Innovative technological product: the innovativeness of the technical solution is determined by the possibility of using the heat of the air in the greenhouse and the implementation of contact heat exchange between the air flow and the packing particles. The design of the regenerator, the simplicity of its manufacture and operation, as well as the efficiency of air heat accumulation in the greenhouse during the daytime, allow to recommend it for use in greenhouse farms. The scope of the innovative technological product: regenerative heat exchangers with a dense layer of granular material for the utilization of low-grade air flows generated in food production enterprises, ventilation systems and greenhouses

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Section: Problem Descriptionmentioning

confidence: 99%

Experimental study of a pilot unit of a ground regenerator for greenhouses

Mukminov

Volgusheva

Georgiesh

et al. 2022

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“…From the characteristic equation ( 5), it is possible to obtain the value of k. Analysis of (11) shows that for each value of Bio there are many solutions. The simplest way to solve this equation is graphically [10].…”

Section: Research Proceduresmentioning

confidence: 99%

“…Fig. 4 shows the results of calculating the temperature of the material along the length of the channel at different values of the heat transfer coefficient (which is associated with a change in air flow) and at different values of the heat transfer coefficient (which is associated with a change in air flow) at τ=1800 s. The choice of α=17 W/m 2 K was determined by experimental data conducted under similar conditions [11].…”

Section: Research Proceduresmentioning

confidence: 99%

Mathematical modeling of the heat transfer process in a dense blown layer of granular material

Boshkova

Mukminov

2022

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The object of research: a mathematical model of unsteady heat transfer between particles forming a dense layer in a heat exchange channel and an air flow passing through the layer. Investigated problem: obtaining a mathematical model adequate to the physical phenomenon will significantly expand the field of research, reduce the time for determining the thermal characteristics of heat transfer and data processing. The main scientific results: an explicit analytical dependence is obtained that allows calculating the local temperature of the layer in an arbitrary cross-section of the channel at selected moments of time. The presented analytical dependence was verified by analyzing the calculated data on the material temperatures in the channel obtained by varying the main physical quantities: the effect of the heating duration, heat transfer coefficient, porosity, and density on the temperature distribution was studied. The temperatures along the length of the channel were calculated at different points in time with the following initial data: material - gravel: c=860, ρ=1500, λ=0.6, ε=0.4; aud=800. Based on the results of the calculations for the time τ=60 s, τ=900 s, τ=1800 s, τ=2400 s, τ=1800 s, the graphs shown in the paper are constructed. It is shown that the mathematical model adequately describes the process of heating a layer of granular material in a heat exchange channel and allows obtaining satisfactory data on the temperature distribution along the length at different points in time. The calculated data correlate satisfactorily with the experimental results. Innovative technological product is an analytical dependence obtained for the first time, which is necessary for inclusion in the calculation method of regenerative heat exchangers intended for the utilization of low-potential heat flows. The area of practical use of the research results is the heat engineering calculations of regenerative heat exchangers with a dense granular packing. The consumers of the developed regenerators are greenhouses and food industry. Such industries are characterized by a low-potential level of thermal emissions, the heat of which is difficult to utilize using existing heat exchange equipment. Scope of the innovative product: design bureaus focused on the design of innovative heat exchangers for the utilization of low-potential heat flows, and research laboratories studying the processes of heat exchange between a dense layer of granular material and a through gas (air) flow.

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Аналіз Ефективності Тепличного Ґрунтового Регенератора З Гранульованою Насадкою

Boshkova¹,

Volgusheva²,

Altman³

et al. 2021

RET

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Акутальним в наш час є пошук ефективних акумуляторів сонячної енергії для обігріву приміщень в умовах значного добового перепаду температур. В якості акумулюючого тіла доцільно застосовувати щільний шар гранульованих матеріалів. Вивчено можливість застосування теплообмінного апарату регенеративного типу з гранульованою насадкою у вигляді щільного шару. Нагрівання гранульованої насадки здійснюється потоком повітря з внутрішнього простору. Проектований регенератор призначений для підтримки необхідного температурного рівня. Ідея створення ґрунтового регенератора ґрунтується на відомостях про інтенсивність нагріву повітря в теплиці від сонячного випромінювання в денний час і ефективності контактного теплообміну між повітрям і шаром частинок. Пропоноване схемне рішення передбачає забір повітря з верхньої частини теплиці, що забезпечує подачу потоку повітря в канал при максимальній температурі. Розглядається застосування щільного шару щебню в якості теплообмінної насадки. Представлені результати теплового розрахунку регенератора, проведені для теплиці з площею основи 18 м2. Кліматичні умови відповідають регіонам з помірним кліматом, наприклад, Одеській області. Для середнього рівня інсоляції, характерного для квітня, і заданої тривалості нагріву шару, визначені основні геометричні характеристики теплообмінних каналів. Наведено результати попереднього розрахунку теплових втрат від теплиці в нічний час і час, протягом якого теплота, акумульована регенератором, буде йти на обігрів внутрішнього обсягу теплиці. Отримано, що акумульована теплота дозволяє підтримувати допустиму температуру в теплиці протягом 2,5 години без застосування інших засобів обігріву. При підвищенні температури навколишнього середовища час роботи регенератора буде збільшуватися, що сприяє більшому зниженню енергетичних витрат на підтримку клімату в теплиці

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Development of a soil regenerator with a granular nozzle for greenhouses

Cited by 3 publications

References 13 publications

Experimental study of a pilot unit of a ground regenerator for greenhouses

Experimental study of a pilot unit of a ground regenerator for greenhouses

Mathematical modeling of the heat transfer process in a dense blown layer of granular material

Аналіз Ефективності Тепличного Ґрунтового Регенератора З Гранульованою Насадкою

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