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001-es BibID:BIBFORM089362
Első szerző:Hadnagy István (meteorológus)
Cím:Climatic conditions of wind energy use in the Polonyna Borzhava Mountains (Transcarpathia, Ukraine) / Hadnagy István, Tar Károly, Lázár István, Kohut Erzsébet
Dátum:2020
Megjegyzések:This paper deals with the statistical structure, seasonal peculiarities of wind climate at meteorological station Play (in Ukrainian: meteorolog?čnastanc?âPlaj, location: 48°40'1'' N; 23°11'51'' E, 1330 m above sea level) located in the Polonyna Borzhava Mountain of the North-Eastern Carpathians. Furthermore, it determines significant parameters of exploiting wind energy. Weibull distribution was applied to determine specific wind power and characterize its annual course. Wind speed was analyzed together with the available daily and yearly course of wind power. Wind power density determined by means of distribution parameters at Play is 169.0 W/m2 and 8.0-9.0 m/s winds yield most energy over the year. The minimum number of energetically utilizable wind hours is in summer, while its maximum is in spring. On the territory represented by the measuring point, a 3 m/s start-up speed wind turbine could operate 63% time over the year. Finally, the periods were specified, and those wind directions were chosen that are richer in wind energy than others. The most frequent characteristic wind direction with the highest mean velocity in each season is southwestern; its average relative frequency is 34.4%. Mean speed of characteristic wind directions is 5.8 m/s. South-western wind direction yields 47% of the total energy.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
wind energy
wind speed
wind power density
Transcarpathia
Megjelenés:DRC, Sustainable Future: Journal of Environment, Agriculture, and Energy. - 1 : 2 (2020), p. 136-146. -
További szerzők:Tar Károly (1947-) (klimatológus) Lázár István (1986-) (geográfus) Kohut Erzsébet
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2.

001-es BibID:BIBFORM065140
Első szerző:Kerekes Attila (épületgépész)
Cím:Effect of wall thickness on the solar gain / Attila Kerekes
Dátum:2016
ISSN:2067-5534 2284-6999
Megjegyzések:Utilized passive solar gain covers considerable part of heat losses, especially in well insulated buildings. At the same time the thermal insulation of the wall in such a building, e.g. approaching the ?Passivhaus" standard is about 20 cm thick. Unless a light weight building is spoken of further 20-30 cm loadbearing layer and the surface finishing should be added resulting in a total thickness of 45-60 cm. The thick wall narrows the cross section through which the direct solar beam may enter the room thus decreases the solar gain. The movement of the solar beam during the day and season can be followed on the base of the sun path diagram. One could say that on the other hand a massive loadbearing layer - especially if it is on the inner side - increases the heat storage capacity, thus increases the utilized part of the solar gain. Series of thermal simulation proves that the effect of heat storage capacity is less important in comparison with the cross section through which the solar beam enters the room. In other terms a light weight building with thin walls performs better than a massive one with thick wall providing the U-value is the same in both cases. In this paper the results of simulation will be presented. Certainly the wall should fulfill many requirements including load, weather-proofness, thermal insulation, building technology. Solar beam is only one of the many aspects. Nevertheless simple geometric tricks may lead to a good compromise, e.g. bevel edge reveal which is not perpendicular to the façade. No doubt in this case the thermal bridge losses around the window perimeter will be higher however this will be compensated by the solar gain.
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
wall thickness
passive solar gain
reveal geometry
Megjelenés:Journal of Sustainable Energy. - 7 : 1 (2016), p. 15-21. -
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