Influence of Ambient Temperature, Wind Speed, Emissivity, and Average Working Temperature of Light-Absorbing Heat-Exchange Panels of Flat-Plate Solar Water-Heating Collectors on Their Thermal Losses Through Translucent Coatings

Авезова, Н. Р.; Avezov, R. R.; Vokhidov, A. U.; Rakhimov, E. Yu.; Gaziev, U. Kh.

doi:10.3103/s0003701x19010043

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…The solar energy gross potential totals 2 134 x 103 PJ, while technical potential is estimated at 7 411 PJ, which is equivalent to almost four times the country's current primary energy consumption [2]. There has been overwhelming researches and studies regarding utilization of solar energy for different purposes, mainly for heat energy and electricity production [3][4][5][6][7][8][9]. In the scientific work [10] two types of photovoltaic, monocrystal and polycrystal, modules were tested under Tashkent region environmental condition to determine the influence external condition on photovoltaic energetic performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of solar powered refrigerator in Uzbekistan climate

Abdullaev

Axaopoulos

Sakellariou

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The energetic performance of autonomous solar powered refrigerator is analyzed. In this refrigerator, the solar energy is converted into electrical energy by a photovoltaic (PV) array, then the generated electrical energy is used to power a vapor – compression system which produces cooling energy at its evaporator. The evaporator is sunk to the water so that produced cooling energy is used to formation water ice, thus accumulates cooling energy in the form of ice. While, compressor is working during the daylight hours, cooling energy is produced. During the night, the cooling energy comes from latent heat of fusion of ice which is collected in day time. The results of experiments showed that not only the solar energy has influence on the energetic performance of solar refrigerator but ambient temperature is also crucial factor in this case.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of solar powered refrigerator in Uzbekistan climate

Abdullaev

Axaopoulos

Sakellariou

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…As concerns the experimental supersonic gas-dynamic stand, it is understood that this process is the harmful one, because of availability of this process will not make it possible to ensure a rigorous calculation of the stream parameters at the perpendicular cut of the channel (Ovsyannik and Makeeva, 2018; Avezova et al, 2019;Babak et al, 2019). In the course of flow of the heterogeneous mixtures within the accelerators, which are characterized by such shapes due to the small dimensions of particles (within the submicron range), it is possible to consider that motion of the particles along these channels is the motion in the straight line.…”

Section: Introductionmentioning

confidence: 99%

Formation of the Supersonic Heterogeneous Streams in the Gasdynamic Accelerators With Great Elongation

Никитин¹,

Rabinskiy²,

Tushavina³

2019

PTQ

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The present article describes results of the experimental and theoretical investigation of gas dynamics and heat exchange in the course of a supersonic flow of the gas-powder mixture within the axially symmetric gas-dynamic accelerators, which have small critical cross-sections (dcritical from 1 to 3 mm) and substantial elongation (L/dcritical from 70 to 200). The necessity of performance of such investigations was determined by two aspects. The first is the development of the innovative technologies with the purpose of formation of the heat-resistant coatings and other coatings with various functions and necessary properties (formation of such coatings with the help of supersonic heterogeneous streams). The second is the creation of the supersonic heterogeneous streams, which are required for the development of experimental investigations of processes of the erosive and corrosive wear of structural components of the high-speed air vehicles, which conduct flights in atmospheric anomalies (rain clouded sky and dust-in-air conditions). This study describes the entire cycle of the experimental investigations, which were performed with the purpose of construction of the more reliable mathematical model of flow of the nonisentropic heterogeneous streams in the gas-dynamic accelerators with great elongation. The viscous gas flow parameters were calculated using the classical model of a flat boundary layer. The value of the characteristics of the carrier gas flow, the dispersion of particles and their material for accelerating particles in a heterogeneous flow were found out. The study showed that the design of gasdynamic micro accelerators must be carried out taking into account the increase in the thickness of the boundary layer along the walls of the particle accelerator. In addition, this article presents a more detailed description of gas dynamics of flow and heat exchange of the heterogeneous mixtures within supersonic gasdynamic accelerators with mass concentration of the powder particles ("К-phase") in the stream up to 15%.

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