Osh, Kyrgyzstan
Osh, Kyrgyzstan

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Ismanzhanov A.I.,Kyrgyz Uzbek University | Murzakulov N.A.,Osh Technological University | Ismanzhanova A.K.,National Academy of science of Kyrgyzstan
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2014

The optical-energy and thermal-insulation properties of a two-layer clear coat for solar green-houses based on flat glass and plastic film have been investigated. The coat has good light-transmission and high thermal-insulation properties compared to single transparent coatings, viz., glass and polyethylene. © 2014 Allerton Press, Inc.

Klychev S.I.,Academy of Sciences of Uzbekistan | Ismanzhanov A.I.,Kyrgyz Uzbek University | Ermekova Z.K.,Kyrgyz Uzbek University
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2015

Instantaneous and average cosine factors of low-potential solar installations (LPSIs), i.e., fixed and single-axis tracking collectors, and solar batteries, are investigated. It is confirmed that in the case of year-round operation the optimum tilt to the horizon of a fixed LPSI is close to the site’s latitude. It is shown that for a fixed LPSI in the case of permissible variations of the solar flux on a receiver at ±20%, the daily LPSI operation time for Uzbekistan’s latitudes is about eight hours. It is also shown that depending on the season of the year the single-axis tracking increases the average cosine factor by 6–14% if the LPSI is active six hours a day and by 14–30% if it is active nine hours a day. The instantaneous cosine factor increase using tracking is more significant and is 25–50% after 3:00 p.m. and 50–100% after 4:00 p.m., depending on the season. The effect of discrete additional turns of a single-axis tracking LPSI manifests itself for the average cosine factor only in the winter time and ranges from 11 to 15%. © 2015, Allerton Press, Inc.

Ismanzhanov A.I.,Kyrgyz Uzbek University | Ismanzhanov A.I.,Academy of Sciences of Uzbekistan | Rasakhodzhaev B.S.,Kyrgyz Uzbek University | Rasakhodzhaev B.S.,Academy of Sciences of Uzbekistan
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2011

Soil solar water heating collectors (SWHCs) are the subject of consideration; their bottom part is a layer of insulation-soil or air-soil. Soil temperature fluctuations and heat emissions have been investigated through the soil bottom. The heat emissions in SWHCs and water heating collectors are quite similar. © 2011 Allerton Press, Inc.

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