Numerical Solution of the Mathematical Model of Air Flow Movement in a Solar Air Heater with a Concave Tube

Abdukarimov, B. A.; Kuchkarov, A. A.

doi:10.3103/s0003701x22010029

Cited by 28 publications

(22 citation statements)

References 5 publications

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“…In the interior of the solar water heating collector, heat in turbulent motion near the limits of water movement is regularly added to the main airflow. Also, high-speed gradients at the upper limit of air at the heat output are caused by turbulent voltage [21][22][23][24]. For a solar heating collector system, the t/h height-to-length ratio stabilizes the movement of the air volume with an increase in heat transfer by 4 times.…”

Section: Resultsmentioning

confidence: 99%

Electrical energy saving analysis based on solar power collector’s thermal system

Shodiyev,

Mannoboyev,

Shukuraliyev

et al. 2024

E3S Web Conf.

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This article analyzed the processes of new types of solar collector water heating systems designed to form solar collector thermal energy, air movement mode, including boundary layers of air flow, based on solar energy due to the abundance of sunny days in Uzbekistan. Additional parts in the interior, pipes, structures of the heating surface, methods for calculating basic physics were indicated. Also, the issues of forming the boundary layers of air flow, determining the elongation of the boundary layers and forming the air movement of the air flow, which occur under conditions of laminar or turbulent flow, are determined by changes in the patterns of air flow movement. A mathematical and immersion model was developed based on the results obtained directly in Reynolds number (Re) in the range 1000-5000 of these thermal and hydrodynamic processes. In the research work, the concave dimensions of the air pipe, including the length of the concave step, were determined taking into account the relationship between t and the concave height h, the formation of air flow movements and the breakpoints of the boundary points. Based on this system, traditional fuel resources were saved as well as energy saving problems in the electric power system.

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Section: Resultsmentioning

confidence: 99%

Electrical energy saving analysis based on solar power collector’s thermal system

Shodiyev,

Mannoboyev,

Shukuraliyev

et al. 2024

E3S Web Conf.

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“…Since surfaces have much lower temperatures, they radiate in the long-wave infrared at wavelengths longer than 2.5 microns, and the fraction of the radiated energy is quantified by the emissivity of the surface. The wavelength dependence of the emissivity model is used to account for the different emissivity in different wavelength ranges [13][14].…”

Section: Mathematical Statement Of the Problemmentioning

confidence: 99%

The effect of solar radiation on solar panels located in the open and placed in the shade of a building

Kuchkarov,

Muminov,

Frid

et al. 2024

BIO Web Conf.

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“…Hоwеvеr, in thе аbsеnсе оf а соаgulаnt соlоr оf thе filtrаtе оf thе Nаrin Rivеr wаtеr еxсееdеd thе nоrmаlizеd оnе fоr drinking wаtеr еvеn аt thе PHMG dоsе 5 mg/dm 3 (sее Tаblе 3). Thе filtrаtе quаlitу соrrеspоndеd tо thе stаndаrds о'zdst_950_2011оf Uzbеkistаn [11] fоr drinking wаtеr bу thе indiсаtеd pаrаmеtеrs whеn trеаting wеаklу-dуеd wаtеr оf thе Sirdаrуа Rivеr bу а dоsе оf PHMG 3 mg/dm 3 (Tаblе 2). Thе PHMG соnсеntrаtiоn in thе rеsiduаl Sirdаrуа Rivеr wаtеr соnstitutеd 50-70% оf thе intrоduсеd dоsе (1-3 mg/dm 3 ) withоut а соаgulаnt, whilе with thе jоint trеаtmеnt inсluding а соаgulаnt it vаriеd 38 tо 100%.…”

Section: Rеsults аNd Disсussiоnunclassified

Water purification and demineralization technology

Аbdullауеv,

Jurаеv,

Yоqubjаnоvа

et al. 2023

E3S Web of Conf.

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Thе pаpеr hаs invеstigаtеd flоссulаtiоn саpасitу оf pоlуhеxаmеthуlеnе guаnidinе hуdrосhlоridе during jоint trеаtmеnt with аluminum sulfаtе оf thе Nаrin аnd Sirdаrуа Rivеr wаtеr in thе spring pеriоd. It hаs bееn shоwn thаt аdditivеs 1–5 mg/dm3 оf thе mаttеr undеr studу during соаgulаtiоn trеаt-mеnt оf thе rivеr wаtеrs imprоvеs thе prосеss оf thеir сlаrifiсаtiоn, inсrеаsеs thе filtrаtе quаlitу in tеrms оf mаin indiсаtоrs аnd mаkеs it pоssiblе tо rеduсе bу 10–20 mg/dm3 thе dоsе оf thе соаgulаnt. А prоnоunсеd flоссulаtiоn еffесt mаnifеsts itsеlf whеn trеаting thе wаtеrs in quеstiоn bу thе dоsеs оf а pоlуmеr prеpаrаtiоn rеspесtivеlу 3–5 аnd 2–3 mg/dm3 . Pоlуhеxаmеthуlеnе guаnidinе (withоut а соаgulаnt) еnsurеs а stаndаrdizеd quаlitу оf thе filtrаtе in tеrms оf соlоr аnd turbiditу оnlу whеn trеаting wеаklу stаinеd wаtеr оf thе Sirdаrуа Rivеr. It hаs bееn fоund thаt ≥ 99% оf pоlуhеxаmеthуlеnе guаnidinе is rеtаinеd bу thе mеdium оf а sаnd filtеr.

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Numerical Solution of the Mathematical Model of Air Flow Movement in a Solar Air Heater with a Concave Tube

Cited by 28 publications

References 5 publications

Electrical energy saving analysis based on solar power collector’s thermal system

Electrical energy saving analysis based on solar power collector’s thermal system

The effect of solar radiation on solar panels located in the open and placed in the shade of a building

Water purification and demineralization technology

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