| Determination of Weibull parameters for wind energy analysis of Izmir, Turkey K Ulgen, A Hepbasli International Journal of Energy Research 26 (6), 495-506, 2002 | 297 | 2002 |
| Experimental and theoretical investigation of effects of wall’s thermophysical properties on time lag and decrement factor K Ulgen energy and buildings 34 (3), 273-278, 2002 | 237 | 2002 |
| Optimum tilt angle for solar collectors K Ulgen Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 28 …, 2006 | 168 | 2006 |
| Diffuse solar radiation estimation models for Turkey’s big cities K Ulgen, A Hepbasli Energy Conversion and management 50 (1), 149-156, 2009 | 159 | 2009 |
| Estimation of wind power potential using Weibull distribution A Genc, M Erisoglu, A Pekgor, G Oturanc, A Hepbasli, K Ulgen Energy Sources 27 (9), 809-822, 2005 | 156 | 2005 |
| Exergetic assessment of direct-expansion solar-assisted heat pump systems: Review and modeling O Kara, K Ulgen, A Hepbasli Renewable and Sustainable Energy Reviews 12 (5), 1383-1401, 2008 | 140 | 2008 |
| An approach for energy modeling of a building integrated photovoltaic (BIPV) Trombe wall system BK Koyunbaba, Z Yilmaz, K Ulgen Energy and Buildings 67, 680-688, 2013 | 137 | 2013 |
| Review and modelling the systems of transmission concentrated solar energy via optical fibres C Kandilli, K Ulgen Renewable and sustainable energy reviews 13 (1), 67-84, 2009 | 127 | 2009 |
| Comparison of solar radiation correlations for Izmir, Turkey K Ulgen, A Hepbasli International Journal of Energy Research 26 (5), 413-430, 2002 | 117 | 2002 |
| Solar radiation models. Part 2: Comparison and developing new models K Ulgen, A Hepbasli Energy sources 26 (5), 521-530, 2004 | 99 | 2004 |
| Optimization of a wind/PV hybrid power generation system R Eke, O Kara, K Ulgen International Journal of Green Energy 2 (1), 57-63, 2005 | 75 | 2005 |
| Prediction of solar radiation parameters through clearness index for Izmir, Turkey K Ulgen, A Hepbasli Energy Sources 24 (8), 773-785, 2002 | 71 | 2002 |
| Estimation of solar radiation parameters for Izmir, Turkey K Ulgen, A Hepbasli International Journal of Energy Research 26 (9), 807-823, 2002 | 66 | 2002 |
| Solar radiation models. Part 1: a review K Ulgen, A Hepbasli Energy Sources 26 (5), 507-520, 2004 | 57 | 2004 |
| Comparison of the diffuse fraction of daily and monthly global radiation for Izmir, Turkey K Ulgen, A Hepbasli Energy Sources 25 (7), 637-649, 2003 | 53 | 2003 |
| Solar illumination and estimating daylight availability of global solar irradiance C Kandilli, K Ulgen Energy Sources, Part A 30 (12), 1127-1140, 2008 | 46 | 2008 |
| Exergetic assessment of transmission concentrated solar energy systems via optical fibres for building applications C Kandilli, K Ulgen, A Hepbasli Energy and Buildings 40 (8), 1505-1512, 2008 | 43 | 2008 |
| Transmission performance of fibre‐optic bundle for solar lighting C Kandilli, AK Turkoglu, K Ulgen International Journal of Energy Research 33 (2), 194-204, 2009 | 39 | 2009 |
| A study on evaluating the power generation of solar-wind hybrid systems in Izmir, Turkey K Ulgen, A Hepbasli Energy Sources 25 (3), 241-252, 2003 | 39 | 2003 |
| Solar energy applications in Turkey A Hepbasli, K Ulgen, R Eke Energy Sources 26 (6), 551-561, 2004 | 35 | 2004 |
