Study of the Thermal Regime of Solar Greenhouses for the Individual Purpose for Their Design Features

Klychev, Sh. I.; Rasakhodzhaev, B. S.; Akhadov, Zh. Z.; Akhmadjonov, U. Z.; Adylov, Ch. A.

doi:10.3103/s0003701x22010091

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…The amount of heat, is determined in the form of a thermal balance according to the simplified heat transfer thermal scheme of the one-dimensional thermal model of energy-efficient solar greenhouses [3][4][5][6][7][8][9][10][11][12] by the formula: ∑Qsol.rad.arr =Qheat loss +Qbat.sys. + Qsoils (1) ∑Qsol.rad.arr -total solar radiation arriving at the surface of the greenhouse in the transparent fence, W; where Qheat loss-total heat loss, W, surface of the enclosure, structural materials and through the bottom of the greenhouse:…”

Section: Resultsmentioning

confidence: 99%

“…In [10] a design of energy-efficient greenhouse with transformable enclosure is presented, in which by transforming the enclosure, changing the volume, the saving of fuel and energy resources is provided. According to the thermal scheme of one-dimensional thermal model of energy-efficient solar greenhouses the thermal balance, in which the transfer of heat energy occurs according to the scheme "Solar radiation-transparent enclosure-plant-heat accumulator-soil" is made.…”

Section: Introductionmentioning

confidence: 99%

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Calculation specifics in the study of solar greenhouses with thermal energy accumulator in mind

Rasakhodjaev,

Boboeva,

Dilishatov

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The paper presents a simplified thermal model that allows estimating heat losses taking into account the main parameters: the surface of the greenhouse - a transparent fence, the bottom of the greenhouse - soil and the ratio of the design of greenhouses. A simplified thermal diagram of the greenhouse heat transfer has been compiled and, on the basis of the simplified thermal diagram, heat losses through the transparent enclosure, through the bottom, soil and structural ratios have been determined by calculation. Calculations show that with total solar radiation, 620 W/m2, heat loss through the surface of a transparent fence is 508 W/m2, in percentage terms it is 82%. At the same time, through the bottom (ground) 58 W / m2, in percentage terms they are 9%, the total heat loss is 566 W / m2, in percentage terms they are 91%. To reduce heat loss through the transparent enclosure, it is recommended to use more innovative materials, such as ceramic film with improved thermal insulation properties or low iron glass, extra clear glass, double-layer transparent enclosure, and it is also recommended to enclose one side of the greenhouse with a thermal insulation wall. According to calculations, in order to reduce heat losses through the bottom of the greenhouse, we recommend making a special deepening in the soil, since at large soil depths, a slow spread of soil temperature is observed, which will also lead to the least heat loss. To reduce heat losses through the bottom of the greenhouse, we recommend using thermal energy accumulators in the ground. Estimation of heat losses makes it possible to determine the required amount of heat loss through the surface and bottom of the greenhouse and, based on these calculations, carry out research work to reduce them.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculation specifics in the study of solar greenhouses with thermal energy accumulator in mind

Rasakhodjaev,

Boboeva,

Dilishatov

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Alterations in the air inside the greenhouse directly affect the soil temperature. Soil temperature changes were studied in the upper layers at 5, 10, 15, and 20 cm depths [6]. In scientific research, the impact of soil temperature on the water heating device placed on the soil was also considered.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], a thermal model of ground-mounted solar water-heating collectors is developed. To determine them, a non-stationary unit thermal model of solar water heater is proposed, which allows to study the dynamics of heating temperatures of the main elements of SVC (transparent enclosure, receiver, heat-insulating ground bottom).…”

Section: Introductionmentioning

confidence: 99%

Automatic control system of greenhouse soil moisture using solar photoelectric systems research

Rasakhodzhaev,

Mingzhi,

Akhmadjonov

et al. 2023

E3S Web Conf.

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This research work is devoted to the study of the system of automatic control of soil moisture in the greenhouse using photoelectric systems. In this regard, work continues to modernise existing and develop new designs of heliothermal greenhouses, in particular, energy-efficient greenhouses with transformable enclosure, in which the volume can be changed by transforming the enclosure. The main objective of the research work is to create an efficient way to save energy and water consumption in greenhouses. The use of solar water pump sprinklers in the soil irrigation system inside the greenhouse can reduce water consumption and electricity consumption. A special sprinkler device is used to spray water on the irrigated area to reduce water consumption. The combined sprinkler is an environmentally friendly and economical device used to minimise electricity and water consumption. Improved systems for saving and rational use of electricity and water resources were used in our research work.

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Investigation of the Influence of Environmental Thermal Characteristics on Thermal Modes of Transparent Boxes

Bahramzhan,

Shavkat,

Fitratullo

et al. 2024

Arch Case Rep

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This paper presents the results of experiments to investigate the influence of thermal characteristics of the environment on the thermal modes of transparent boxes. To conduct experiments on the non-stationary thermal model of solar greenhouses developed by us, two identical transparent boxes with dimensions of 0.80 x 0.65 x 0.80 m were constructed. The transparent boxes have rectangular shapes. One transparent box has glass walls and the other with polyethylene walls. The influence of the thermal characteristics of the environment and the thermal conditions inside the transparent boxes with film and glass transparent walls are investigated. The experimental results show that at a maximum ambient air temperature of 42 °C on 27.06.2024 at 13:48 hours, the air temperature increases to 10% and 23% in transparent boxes with polyethylene and with glass walls, respectively, and at 05:10 hours, the humidity decreases to 8% and 11%, respectively. Thus, the influence of the thermal characteristics of the environment on the thermal conditions of transparent boxes with glass walls, at the maximum ambient temperature, is greater by 1.2 times than in transparent boxes with polyethylene walls, and humidity decreases by half.

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Study of the Thermal Regime of Solar Greenhouses for the Individual Purpose for Their Design Features

Cited by 6 publications

References 7 publications

Calculation specifics in the study of solar greenhouses with thermal energy accumulator in mind

Calculation specifics in the study of solar greenhouses with thermal energy accumulator in mind

Automatic control system of greenhouse soil moisture using solar photoelectric systems research

Investigation of the Influence of Environmental Thermal Characteristics on Thermal Modes of Transparent Boxes

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