Evaluation of heat losses of the solar greenhouse during the heating season

Khusenov, A A; Узаков, Гулом Норбоевич; Rakhimov, A Kh; Ergashev, Sh H

doi:10.1051/e3sconf/202341101025

E3S Web Conf.

2023

DOI: 10.1051/e3sconf/202341101025

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Evaluation of heat losses of the solar greenhouse during the heating season

A A Khusenov

Гулом Норбоевич Узаков

A Kh Rakhimov

et al.

Abstract: The article presents the results of calculation of heat losses in greenhouses with different coatings, taking into account thermal-physical properties of coatings. In addition, based on the results of changes in external air temperature and solar radiation over time, numerical calculations were made on the heat load of a greenhouse with a useful area of 108 m2 and the thermal power provided by solar energy.

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2024

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Cited by 4 publications

References 11 publications

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Simulation of hydrodynamics of the dispersed layer of fruit during solar-convective drying

Khuzhakulov,

Nematov,

Khairiddinov

2024

E3S Web Conf.

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The article proposes a hydrodynamic model of forced convective drying of fruits and vegetables, in which the direction of the coolant flow to the product being dried, the degree of dispersion of the product layer, the hydrodynamics of drying fruits and vegetables in the form of spheroids, flat disks and flat plates, as well as supports with plastic, metal and wooden gratings, modeled based on the necessary equations and criterion equations.

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Simulation of hydrodynamics of the dispersed layer of fruit during solar-convective drying

Khuzhakulov,

Nematov,

Khairiddinov

2024

E3S Web Conf.

View full text Add to dashboard Cite

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Energy indicators of the micro-hydro power plant adjusted to outlet water flows from pump units

Uzakov,

Kuziev,

Safarov

2024

E3S Web of Conf.

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The article presents the prospects and main directions of the development of the use of hydropower sources, the parameters of the micro-hydro power plant, which works efficiently in variable and low-pressure water flows from the pumping units, and the results of the experimental studies of the micro-hydro power plant are presented. The developed vertical-axis micro-hydro power plant consists of a propeller-type hydro turbine with a diameter of 0.5 m, a bushing with a diameter of 0.2 m, and 6 blades with an optimal installation angle θopt=202.50°. It was determined that the maximum power of the micro-HPP is 3 kW and efficiency of the micro-HPP is equal to 0.88. Experimental work was carried out on the device, based on processing the results of the experiment, an empirical equation was obtained that determines the change in water flow consumption and turbine rotation speed of the mechanical power of the hydro turbine, and the significance of the regression equations was evaluated using Fisher‘s F-criterion. The significance level is 0.05 and at the number of degrees of freedom γ1 =63, γ2 =59 the calculated value of Fisher‘s F-criterion (Fcal= 1.03) is smaller than the value in the table (Ftab= 1,53), so the constructed regression equation is significant. The relative error of the calculation is ± 6 %. The proposed micro-HPP has the possibility of uninterrupted supply of electricity to electricity consumers in remote areas that are not connected to the centralized electricity supply system.

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Mathematical modeling of the refrigerating chamber of a combined solar dryer-refrigerator with a heat pump

Ruzikulov,

Ibragimov,

Ergashev

et al. 2024

E3S Web of Conf.

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Mathematical modeling appears to be a valuable tool for controlling the cooling and storage process of agricultural products. Therefore, mathematical modeling of the balance of heat and mass in refrigeration chambers is relevant. Mathematical modeling of the thermal regime of the thermal regime of a refrigeration chamber with a heat pump and determining temperature changes depending on time. Mathematical modeling is carried out based on the thermal balance of the refrigerating chamber by the method of conservation of mass and energy. It has been established that cooling and long-term storage of agricultural products in refrigeration chambers require a huge amount of electrical energy. At an outside air temperature of 30℃, it takes 30-40 minutes to cool products to the required temperature; for long-term storage, 5.5-6.0 kWh/day of electrical energy is consumed. A combined dryer-refrigerator with a heat pump for storing agricultural products is proposed and a mathematical model of the refrigeration chamber is given, which makes it possible to analyze the temperature regime in the refrigeration chamber.

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Evaluation of heat losses of the solar greenhouse during the heating season

Cited by 4 publications

References 11 publications

Simulation of hydrodynamics of the dispersed layer of fruit during solar-convective drying

Simulation of hydrodynamics of the dispersed layer of fruit during solar-convective drying

Energy indicators of the micro-hydro power plant adjusted to outlet water flows from pump units

Mathematical modeling of the refrigerating chamber of a combined solar dryer-refrigerator with a heat pump

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