DETERMINATION OF THE DUST AND SHADING EFFECT ON THE OPTICAL AND ENERGY CHARACTERISTICS OF THE FLAT-PLATE SOLAR COLLECTOR WITH TWO GLASS TRANSPARENT COVERS

The paper presents the results of the calculation of optical and energy parameters of the flat-plate solar collector (FSC) with two glass transparent covers. The author of this paper carried out the calculations taking into account a number of structural and optical parameters of the FSC for the worst weather conditions observed in the 15 January 2014.  Firstly, the angles of refraction of sunlight were found considering the diurnal variation of the angle of incidence of sunlight on the surface of the FSC. Secondly, it were defined the reflectance of interfaces, transmittance of a transparent coating of FSC taking into account only the reflectance, and only the absorbability, and, lastly, total transmittance. The paper identifies the reflectance, transmittance and absorbability, as well as hourly and daily averages of FSC efficiency with and without the influence of dust and shading on transparent cover. It was found that the cumulative effect of virtually dust and shading coefficients on the optical and thermal power settings FSC does not exceed 5 ÷ 6% and radiation efficiency varies in the range of 57 ÷ 143 W / m² under the conditions of the Absheron Peninsula, in normal service.

1. Salamov O.M. Process Akkumulirovaniâ solnečnoj ènergii s ispolʹzovaniem poluprovodnikovyh fotopreobrazovatelej: Diss. kand. fiz.-mat. nauk. Baku, 1990 [in Russ.].

2. Salamov O.M., Mammadov F.F., Samadova U.F. Prospects of wind energy application in Azerbaijan. International Scientific Journal "Alternative Energy and Ecology" (ISJAEE), 2010, no. 1 (81), pp. 132–144.

3. Daffi Dž.A., Bekman U.A. Teplovye processy s ispolʹzovaniem solnečnoj ènergii. Moscow: Mir Publ., 1977 [in Russ.].

4. Bajramov R.A., Ushakova A.D. Solnečnye vodonagrevatelʹnye ustanovki. Ashhabad.: Ylym Publ., 1987 [in Russ.].

5. Bekman U., Klejn S., Daffi Dž. Rasčet sistem solnečnogo teplosnabženiâ. Moscow: Ènergoizdat Publ., 1982 [in Russ.].

6. Nacionalʹnoe soobŝenie Azerbajdžanskoj Respubliki po Ramočnoj Konvencii OON po klimatu. Gosudarstvennyj Komitet po Gidrometeorologii Azerbajdžanskoj Respubliki. B.: 2011 [in Russ.].

7. Salamov O.M., Abbasova F.F., Rzaev P.F. Rasčet solnečnoj vodopodogrevatelʹnoj sistemy dlâ gorâčego vodosnabženiâ selʹskoj semʹi. International Scientific Journal “Alʹternativnaâ ènergetika i èkologiâ” (ISJAEE), 2006, no. 10 (42), pp. 30–36 [in Russ.].