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References Avezova, N., Avezov, R. (2009). Impact of solar radiation attenuation coefficient of translucent cover material on heat efficiency of translucent cover-radiation absorbing heat-exchange panel system of flat solar collectors. Applied Solar Energy, 4, 28-31. Dąbrowski, J., Hutnik, E., Tatko, R. (2006). Szacowanie ilości cieplnej możliwej do pozyskania przez kolektory słoneczne. Inżynieria Rolnicza, 2(66), 205-212. Dąbrowski, J. (2009). Kolektory słoneczne do podgrzewania wody użytkowej. Efektywność i opłacalność inwestycji. Wrocław, Wydawnictwo UP, ISBN

-122. Lund, H. (1994) Solar Measurement Station . Thermal Insulation Laboratory. Technical University of Denmark. Report 94-18. Perers, B. (2000) A Solar Collector Model and Emulator for IEA Task 26, Description for Solar Thermal System Testing . Based on the CEN 12975 and the TRNSYS Type 132 Collector Model. Battenfall Utveckling AB. Rind, D. H. – Lean, J. L. (2009) How will Earth’s surface temperature change in future decades? Geophys Res Lett 2009, 36, L15708. DOI:10.1029/2009GL038932 Rottman, G. – Lean, J. – Harder, J. – Kopp, G. (2005) Solar Radiation and Climate

References 1. Patancar, S.V., & Spalding, D.B. (1972). A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows. International journal of heat and mass transfer , 15 , 1787. 2. Sopian, K., Syahri, M., Abdullah, S., Othman, M.Y., & Yatim, B. (2004). Performance of a non-metallic unglazed solar water heater with integrated storage system. Renewable Energy, 29 , 1421-1430. 3. Gorla, R.S.R. (1997). Finite element analysis of a flat plate solar collector. Finite Elements in Analysis and Design , 24 , 283-290. 4. Turgut, O


The goal of the paper was to simplify the designing process for mass and energy flow through solar collector - chimney system. Theoretical analysis allowed to get involved system of three nonlinear analytical equations in dimensionless forms that have been saved. Dimensionless numbers for the problem are well known in the literature on fluid mechanics and thermodynamics: Reynolds, Grashof, Galileo, Biot and Prandtl. In the analyzed equations are also dimensionless geometric parameters expressing the ratios of basic geometrical dimensions of the collector system-chimney: the radius disc collector to the thickness gap, the height and radius of the chimney. In the system of equations, the Reynolds number is treated as the determined number, which is a novelty of the method used.

Vplyv relaxačného času na kvalitu pigmentovanej vrstvy solárneho kolektora

Skúmal sa vplyv relaxačného času periodického reverzného prúdu na kvalitu vyfarbovania povrchu anodicky oxidovaného hliníka. Na vyfarbovanie sa použil elektrolyt bez komplexotvorného činidla a s komplexotvorným činidlom. Študoval sa aj vplyv frekvencie impulzového prúdu. Kvalita vyfarbených povrchov sa hodnotila spektrokolorimetricky a množstvo vylúčeného niklu sa určilo atómovou absorpčnou spektroskopiou. Zistilo sa, že relaxačný čas periodického reverzného prúdu významne ovplyvňuje kvalitu vyfarbených povlakov pre elektrolyty bez komplexotvorného činidla.

REFERENCES 1. Abdulhadi, M.. and Ghorayeb, F. (2006). A self-tractable solar collector. International Journal of Sustainable Energy , 25(2), 63–78. 2. Ahwide, F., Spena, A., and El-Kafrawy, A. (2013). Correlation for the average daily diffuse fraction with clearness index and estimation of beam solar radiation and possible sunshine hours fraction in Sabha, Ghdames and Tripoli – Libya. APCBEE Procedia , 5, 208–220. 3. Andersen, E. et al. (2015). Measurements of the angular distribution of diffuse irradiance. Energy Procedia , 70, 729–736. 4. http

References [1] S. Furbo, I. J. Shah. Optimum solar collector fluid flow rate, Proceeding of Eurosun , Department of Building and Energy (1996) 996 [2] L. M. Nhut, Y. C. Park. A study on automatic optimal operation of a pump for solar domestic hot water system Solar Energy 98 (2013) 448-457 [3] T. Persson, M. Ronnelid. Increasing solar gains by using hot waterto heat dishwashers and washing machines Applied Thermal Engineering 27 (2007) 646-657 [4] V. Badescu. Optimal control of flow in solar collector systems with fully mixed water storage tanks Energy

. (1991). Solar Engineering of Thermal Processes (2 nd ed-n). John Wiley & Sons, Inc. (USA). ISO LVS EN 12975-2. (2006). Thermal solar systems and components - Solar collectors. Part 2: Test methods. Andersen, E., & Furbo, S. (2009). Theoretical variations of the thermal performance of different solar collectors and solar combisystems as function of the varying yearly weather conditions in Denmark. Solar Energy, 83 (4), 552-565. Fiedler, F., Nordlander, S., Persson, T., & Bales, C. (2006). Thermal performance of combined solar and pellet heating system. Renewable

REFERENCES Aoues, K., Noureddine, M., Zellouf, M., Benchabane, A., 2011, Thermal performance improvement of solar air flat plate collector: A theoretical analysis and an experimental study in Biskra, Algeria. Int. J. Ambient Energy, 32(2), 95-102. Bochenek, D., Niemiec, P., Korzekwa, J., Durtka, B., Stoklosa, Z., 2018, Microstructure and Properties of the Ferroelectric-Ferromagnetic PLZT-Ferrite Composites. Symmetry-Basel, 10 (3), art.59. Butuzov, V., 2013, Air solar collectors . Plumbing, heating, air conditioning, 7, 1-5, (Russian). Domagala, M., Momein, H

References Temkins, A., Barkans, V., Shipkovs, P., Vanags, M., Lebedeva, K., & Shipkovs, J. (2005). Heat conduction process on plane surface of a solar collector absorber: the mathematical description. Latv. J. Phys. Tec. Sci. , 6, 3-15. Barkāns, V., Temkins, A., Shipkovs, P., Vanags, M., & Lebedeva, K. (2007). Nestacionāra siltumvadīšanas procesa matemātisks apraksts saules kolektorā. Latvijas Jūras Akadēmija, 9. Starptautiskā konference, Ūdens Transports un Infrastruktūra , 214-225 (in Latvian). Barkāns, V., Temkins, A., Shipkovs, P., Kaškarova G., Vanags, M