TY  - JOUR
AU  - Živković, Predrag
AU  - Tomić, Mladen
AU  - Bakić, Vukman
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9183
AB  - Wind power assessment in complex terrain is a very demanding task. Modeling wind conditions with standard linear models does not sufficiently reproduce wind conditions in complex terrains, especially on leeward sides of terrain slopes, primarily due to the vorticity. A more complex non-linear model, based on Reynolds averaged Navier-Stokes equations has been used. Turbulence was modeled by modified two-equations k-? model for neutral atmospheric boundary-layer conditions, written in general curvelinear non-orthogonal co-ordinate system. The full set of mass and momentum conservation equations as well as turbulence model equations are numerically solved, using the as CFD technique. A comparison of the application of linear model and non-linear model is presented. Considerable discrepancies of estimated wind speed have been obtained using linear and non-linear models. Statistics of annual electricity production vary up to 30% of the model site. Even anemometer measurements directly at a wind turbine?s site do not necessarily deliver the results needed for prediction calculations, as extrapolations of wind speed to hub height is tricky. The results of the simulation are compared by means of the turbine type, quality and quantity of the wind data and capacity factor. Finally, the comparison of the estimated results with the measured data at 10, 30, and 50 m is shown.
T2  - Thermal Science
T1  - Experimental validation of wind energy estimation
VL  - 24
IS  - 6 Part A
SP  - 3795
EP  - 3806
DO  - 10.2298/TSCI191207474Z
ER  - 

@article{
author = "Živković, Predrag and Tomić, Mladen and Bakić, Vukman",
year = "2020",
abstract = "Wind power assessment in complex terrain is a very demanding task. Modeling wind conditions with standard linear models does not sufficiently reproduce wind conditions in complex terrains, especially on leeward sides of terrain slopes, primarily due to the vorticity. A more complex non-linear model, based on Reynolds averaged Navier-Stokes equations has been used. Turbulence was modeled by modified two-equations k-? model for neutral atmospheric boundary-layer conditions, written in general curvelinear non-orthogonal co-ordinate system. The full set of mass and momentum conservation equations as well as turbulence model equations are numerically solved, using the as CFD technique. A comparison of the application of linear model and non-linear model is presented. Considerable discrepancies of estimated wind speed have been obtained using linear and non-linear models. Statistics of annual electricity production vary up to 30% of the model site. Even anemometer measurements directly at a wind turbine?s site do not necessarily deliver the results needed for prediction calculations, as extrapolations of wind speed to hub height is tricky. The results of the simulation are compared by means of the turbine type, quality and quantity of the wind data and capacity factor. Finally, the comparison of the estimated results with the measured data at 10, 30, and 50 m is shown.",
journal = "Thermal Science",
title = "Experimental validation of wind energy estimation",
volume = "24",
number = "6 Part A",
pages = "3795-3806",
doi = "10.2298/TSCI191207474Z"
}

Živković, P., Tomić, M.,& Bakić, V.. (2020). Experimental validation of wind energy estimation. in Thermal Science, 24(6 Part A), 3795-3806.
https://doi.org/10.2298/TSCI191207474Z

Živković P, Tomić M, Bakić V. Experimental validation of wind energy estimation. in Thermal Science. 2020;24(6 Part A):3795-3806.
doi:10.2298/TSCI191207474Z .

Živković, Predrag, Tomić, Mladen, Bakić, Vukman, "Experimental validation of wind energy estimation" in Thermal Science, 24, no. 6 Part A (2020):3795-3806,
https://doi.org/10.2298/TSCI191207474Z . .

TY  - CONF
AU  - Stevanović, Žana
AU  - Tomić, Mladen
AU  - Bakić, Vukman
AU  - Živković, Predrag
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12778
AB  - Estimating the wind potential for a particular micro location (siting) involves detailed analysis of the possibility of annual electricity production at that location. Based on the assumption of installed capacity, area and number of hours constant load, it is possible to obtain annual theoretical production of electricity according to expression . The wind atlas for target location contains data onto 5 reference roughness lengths (0.000 m , 0.030 m , 0.100 m , 0.400 m , 1.500 m ) and 5 reference heights (10 m , 25 m , 50 m , 100 m , 200 m ) above ground level . This paer have measured data onto site at target location, and base of that there was modeled digital model of location and wind power model for elevation at 110m. There was estimation of 20 GE (2,78 MW) instaling capacity for target location.
PB  - Zagreb, Croatia : Faculty of Mechanical Engineering and Naval Architecture
C3  - SDEWES : 14th Conference on Sustainable Development of Energy, Water and Environment Systems : Book of abstracts
T1  - Estimation of Power Production of Wind Potential
SP  - 417
EP  - 417
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12778
ER  - 

@conference{
author = "Stevanović, Žana and Tomić, Mladen and Bakić, Vukman and Živković, Predrag",
year = "2019",
abstract = "Estimating the wind potential for a particular micro location (siting) involves detailed analysis of the possibility of annual electricity production at that location. Based on the assumption of installed capacity, area and number of hours constant load, it is possible to obtain annual theoretical production of electricity according to expression . The wind atlas for target location contains data onto 5 reference roughness lengths (0.000 m , 0.030 m , 0.100 m , 0.400 m , 1.500 m ) and 5 reference heights (10 m , 25 m , 50 m , 100 m , 200 m ) above ground level . This paer have measured data onto site at target location, and base of that there was modeled digital model of location and wind power model for elevation at 110m. There was estimation of 20 GE (2,78 MW) instaling capacity for target location.",
publisher = "Zagreb, Croatia : Faculty of Mechanical Engineering and Naval Architecture",
journal = "SDEWES : 14th Conference on Sustainable Development of Energy, Water and Environment Systems : Book of abstracts",
title = "Estimation of Power Production of Wind Potential",
pages = "417-417",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12778"
}

Stevanović, Ž., Tomić, M., Bakić, V.,& Živković, P.. (2019). Estimation of Power Production of Wind Potential. in SDEWES : 14th Conference on Sustainable Development of Energy, Water and Environment Systems : Book of abstracts
Zagreb, Croatia : Faculty of Mechanical Engineering and Naval Architecture., 417-417.
https://hdl.handle.net/21.15107/rcub_vinar_12778

Stevanović Ž, Tomić M, Bakić V, Živković P. Estimation of Power Production of Wind Potential. in SDEWES : 14th Conference on Sustainable Development of Energy, Water and Environment Systems : Book of abstracts. 2019;:417-417.
https://hdl.handle.net/21.15107/rcub_vinar_12778 .

Stevanović, Žana, Tomić, Mladen, Bakić, Vukman, Živković, Predrag, "Estimation of Power Production of Wind Potential" in SDEWES : 14th Conference on Sustainable Development of Energy, Water and Environment Systems : Book of abstracts (2019):417-417,
https://hdl.handle.net/21.15107/rcub_vinar_12778 .