Renewable Energy Laboratory

Director: Dr. Hafiz Ali

Email:              hafiz.ali@kfupm.edu.sa

Location:           Bldg-63-Room-336

Phone:  +966-13-860-2548

Representative Publications

• Sahin, A.Z., and Aksakal, A., "Wind Power Energy Potential at the Northeastern ‎Region of Saudi Arabia", Renewable Energy, vol. 14, no. 1-4, pp. 435-440, 1998.‎
• Sahin, A.Z., "Theoretical Limits for Power Generation and Efficiency of Solar Driven ‎Heat Engines", Renewable Energy, vol. 16, no. 4, pp. 2292-2295, 1998.‎
• Sahin, A.Z., Aksakal, A., and Sunar, M., "Solar-Energy Availability in the ‎North-Eastern Arabian Peninsula", Applied Energy, vol. 64, pp. 323-329, 1999.‎
• Sahin, A.Z., and Aksakal, A., "A Statistical Analysis of Wind Energy Potential at the ‎Eastern Region of Saudi Arabia", International Journal of Energy Research, vol. 23, ‎no. 10, pp. 909-917, 1999.‎
• Al-Garni, A.Z., Sahin, A.Z., and Al-Farayedhi, A., "Modeling of Weather ‎Characteristics and Wind Power in the Eastern Part of Saudi Arabia", International ‎Journal of Energy Research, vol. 23, no. 9, pp. 805-812, 1999.‎
• Sahin, A.Z., Aksakal, A., and Kahraman, R., "Solar Radiation Availability in the ‎Northeastern Region of Saudi Arabia", Energy Sources, Journal of Extraction, ‎Conversion, and the Environment, vol. 22, no. 10, pp. 859-864, December 2000.‎
• Sahin, A.Z., "Applicability of Wind-Solar Thermal Hybrid Power Systems in the ‎Northeastern part of Arabian Peninsula", Energy Sources, Journal of Extraction, ‎Conversion, and the Environment, vol. 22, no. 9, pp. 845-850, November 2000.‎
• Sahin, A.Z., "Optimum Operating Conditions of Solar Driven Heat Engines", Energy ‎Conversion and Management, vol. 41, no. 13, pp. 1335-1343, 2000.‎
• Sahin, A.Z., "Wind Energy and Its Environmental Impact", International Journal of ‎Global Energy Issues, vol. 15, no. 3/4, pp. 343-362, 2001.‎
• Sahin, A.Z., Al-Garni, A.Z., and Al-Farayedhi, A., "Analysis of a Small Horizontal ‎Axis Wind Turbine Performance", International Journal of Energy Research, vol. 25, ‎no. 6, pp. 501-506, 2001.‎
• Sahin, A.Z., "Finite Time Thermodynamics Analysis of a Solar driven Heat Engine", ‎International Journal of Exergy, vol. 1, no. 2, pp. 122-126, 2001.‎
• Sahin, A.Z. and Al-Garni, A.Z., "Environmental Impact of Hydrogen Energy Use: ‎Environmental, Efficiency and Economic Aspects of Hydrogen Energy Utilisation", ‎Renewable Energy 2003, An Official Publication of the World Renewable Energy ‎Network, no. 3, pp. 93-95, 2003.‎
• Sahin, A.Z., "The Role of Hydrogen Energy in Sustainable Development", Journal of ‎the Association of Arab Universities for Basic and Applied Science (JAAUBAS), vol. ‎‎1, pp. 77-86, Dec. 2005. ‎
• Yilbas, B.S. and Sahin, A.Z., "Thermoelectric Device and Optimum External Load Parameter and Slenderness Ratio", Energy, vol. 35, no. 12, pp. 5380-5384, 2010. 
• Bejan, A., Lorente, S., Yilbas, B.S., and Sahin, A.Z., "The effect of size on efficiency: Power plants and vascular designs", International Journal of Heat and Mass Transfer, vol. 54, no. 7-8, pp. 1475–1481, 2011.
• Sahin, A.Z., Bolat, A., and Al-Ahmari, A., "Investigation of the Capacity of Underground Water ‎Pumping Using ‎Wind Energy at Dhahran", Arabian Journal for Science and Engineering, vol. 36, pp. 879-889, 2011.‎
• Sahin, A.Z., Yilbas, B.S., Shuja, S.Z., and Momin O., "Investigation into topping cycle: Thermal efficiency with and without presence of thermoelectric generator", Energy, vol. 36, no. 7, pp. 4048-4054, 2011.
• Sahin, A.Z., "The natural optimality in heat and fluid flow phenomena", International Journal of Exergy, vol. 9, no. 3, pp. 346-354, 2011. ‎
• Sahin, A.Z., "The inherent optimality in steady conduction of heat", International Journal of the Physical Sciences, vol. 6, no. 35, pp. 7828-7837, 2011.
• Sahin, A.Z. and Yilbas, B.S., "The influence of operating and device parameters on the maximum efficiency and the maximum output power of thermoelectric generator", International Journal of Energy Research, vol. 36, pp. 111-119, 2012.
• Sahin, A.Z., "The thermodynamic quantity minimized in steady heat and fluid flow processes: A control volume approach", Energy Conversion and Management, vol. 59, pp. 27-32, 2012.
• Lorente, S., Bejan, A., Al-Hinai, K., Sahin, A.Z., and Yilbas, B.S., "Constructal Design of Distributed Energy Systems: Solar Power and Water Desalination", International Journal of Heat and Mass Transfer, vol. 55, no. 9-10, pp. 2213-2218, 2012.
• Rehman, S. and Sahin, A.Z., "Wind power utilization for water pumping using small wind turbines in Saudi Arabia: A Techno-economical Review", Renewable and Sustainable Energy Reviews, vol. 16, pp. 4470-4478, 2012.
• Sahin, A.Z. and Rehman, S., "Economic Feasibility of Utilizing Photovoltaics for Water Pumping in Saudi Arabia", International Journal of Photoenergy, vol. 2012, Article ID 542416, 9 pages, doi:10.1155/2012/542416, 2012.
• Rehman, S. and Sahin, A.Z., "Wind-Solar PV Hybrid Power System with Battery Backup for Water Pumping in Remote Localities", International Journal of Green Energy, DOI:10.1080/15435075.2012.729169, vol. 13, no. 11, pp. 1075-1083, 2016.
• Al-Merbati, A.S., Yilbas, B.S., and Sahin, A.Z., "Thermodynamics and Thermal Stress Analysis of Thermoelectric Power Generator: Influence of Pin Geometry on Device Performance", Applied Thermal Engineering, vol 50, pp. 683-692, 2013.
• Sahin, A.Z. and Yilbas, B.S., "The thermoelement as thermoelectric power generator: Effect of leg geometry on the efficiency and power generation", Energy Conversion and Management, vol. 65, pp. 26-32, 2013.
• Mahian, O., Pop, I., Sahin, A.Z., Oztop, H.F., and Wongwises, S., "Irreversibility analysis of a vertical annulus using TiO2/Water nanofluid with MHD flow effects", International Journal of Heat and Mass Transfer, vol. 64, pp. 671-679, 2013.
• Mahian, O., Kianifar, A., Kleinstreuer, C., Al-Nimr, M.A., Pop, I., Sahin, A.Z., and Wongwises, S., "A review of entropy generation in nanofluid flow", International Journal of Heat and Mass Transfer, vol. 65, pp. 514-532, 2013.
• Mahian, O., Oztop, H.F., Sahin, A.Z., and Wongwises, S., "Estimation of Operational Costs due to Entropy Generation in a Vertical Annulus", International Journal of Exergy, vol. 13, no. 4, pp. 472-486, 2013.
• Sahin, A.Z., Yilbas, B.S., and Ayar, T., "Thermodynamic Optimization of Irreversible Radiation Driven Power Plants", Journal of Energy Engineering, vol. 139, no. 3, pp. 207-213, 2013.
• Mokheimer, E.M.A., Sahin, A.Z., Al-Sharafi, A., and Ali, A.I., "Modeling and optimization of hybrid wind-solar-powered RO water desalination system in Saudi Arabia", Energy Conversion and Management, vol. 75, pp. 86-97, 2013.
• Sahin, A.Z. and Yilbas, B.S., "Thermodynamic irreversibility and performance characteristics of thermoelectric power generator", Energy, vol. 55, pp. 899-904, 2013.
• Rehman, S. and Sahin, A.Z., "Comparing the Use of Diesel and Wind Power in Pumping Water in Saudi Arabia", Energy and Environment, vol. 25, no. 2, pp. 369-388, 2014.
• Ali, H., Sahin, A.Z. and Yilbas, B.S., "Thermodynamic Analysis of a Thermoelectric Power Generator in Relation to Geometric Configuration Device Pins", Energy Conversion and Management, vol. 78, pp. 634-640, 2014.
• Mahian, O., Kianifar, A., Sahin, A.Z., and Wongwises, S., "Entropy Generation during Al2O3/Water nanofluid Flow in a Solar Collector: Effects of Tube Roughness, Nanoparticle Size, and Different Thermophysical Models", International Journal of Heat and Mass Transfer, vol. 78, pp. 64-75, 2014.
• Heris, S.Z., Mohammadpur, F., Mahian, O., and Sahin, A.Z., "Experimental Study of Two Phase Closed Thermosyphon Using CuO/Water Nanofluid in the Presence of Electric Field", Experimental Heat Tranfer, vol. 28, pp. 328-343, 2015.
• Rehman, S. and Sahin, A.Z., "Performance Comparison of Diesel and Solar Photovoltaic Power Systems for Water Pumping in Saudi Arabia", International Journal of Green Energy, vol. 12, pp. 702-713, 2015.
• Ali, H., Yilbas, B.S., and Sahin, A.Z., "Exergy Analysis of a Thermoelectric Power Generator: Influence of Bi-Tapered Pin Geometry on Device Characteristics", International Journal of Exergy, vol. 16, no. 1, pp. 53-71, 2015.
• Mahian, O., Kianifar, A., Sahin, A.Z., and Wongwises, S., "Heat Transfer, Pressure Drop and Entropy Generation in a Solar Collector using SiO2/Water nanofluids: Effects of nanoparticle size and pH", ASME Journal of Heat Transfer, vol. 137, no. 6, pp. 061011-1 – 9, 2015.
• Mahian, O., Kianifar, A., Sahin, A.Z., and Wongwises, S., "Performance Analysis of a Minichannel-based Solar Collector using different Nanofluids", Energy Conversion and Management, vol. 88, pp. 129-138, 2014.
• Kianifar, A., Mahian, O., Sahin, A.Z., Khan, W.A., and Wongwises, S., "Costs due to Entropy Generation in a Vertical Annulus using Nanofluids and Different Thermophysical Models", Current Nanoscience, vol. 10, n. 5, pp. 1-10, 2014.
• Yilbas, B.S. and Sahin A.Z., "Thermal Characteristics of Combined Thermoelectric Generator and Refrigeration Cycle", Energy Conversion and Management, vol. 83, pp. 42-47, 2014.
• Sahin, A.Z. and Yilbas, B.S., "First and Second Law Analyses of Thermal Power Plants in Connection with Irreversibility Ratio", International Journal of Exergy, vol. 18, no. 3, pp. 356-366, 2015.
• Al-Sharafi, A., Sahin, A.Z., and Yilbas, B.S., "Overall Performance Index for Hybrid Power Plants", Energy Conversion and Management, vol. 100, pp. 103-116, 2015.
• Sahin, A.Z. and Yilbas, B.S., "Performance Analysis of Thermoelectric Power Generator under Volumetric Constraint", Transactions of the Canadian Society for Mechanical Engineering (CSME), vol. 40, no. 1, pp. 31-43, 2016.
• Sahin, A.Z. and Yilbas, B.S., "Influence of Cold Junction Temperature Difference on Thermoelectric Device Efficiency and Power Output", Advances in Mechanical Engineering, accepted for publication, 2015.
• Al-Sharafi, A., Sahin, A.Z., Yilbas, B.S., Shuja, S.Z., "Marangoni-Convection Flow and Heat Transfer Characteristics of Water-CNT Nanofluid Droplet", Numerical Heat Transfer, vol. 69, no. 7, pp. 763-780, 2016.
• Yilbas B.S. and Sahin, A.Z. "Thermal Characteristics of a Skutterudite Thermoelectric Generator: Influence of Device Pin Length on Efficiency and Output Power", International Journal of Exergy, vol. 20, no. 2, pp. 343-360, 2016.
• Al-Sharafi, A., Sahin, A.Z. and Yilbas, B.S., "Measurement of Thermal and Electrical Properties of Multiwalled Carbon Nanotubes–Water Nanofluid", ASME Journal of Heat Transfer, vol. 138, no. 7, 072401 (1-12), 2016.
• Sahin, A.Z., Al-Sharafi, A., Yilbas, B.S., and Khaliq, A. "Overall performance assessment of a combined cycle power plant: An exergo-economic analysis", Energy Conversion and Management, vol. 116, pp. 91–100, 2016.
• R. Loni, A.B. Kasaeian, O. Mahian, A.Z. Sahin, "Thermodynamic analysis of an organic rankine cycle using a tubular solar cavity receiver", Energy Conversion and Management, vol. 127, pp. 494–503, 2016.
• B.S. Yilbas, S.S. Akhtar, A.Z. Sahin, Thermal and Stress Analyses in Thermoelectric Generator with Tapered and Rectangular Pin Configurations, Energy, vol. 114, pp. 52-63, 2016.
• R. Loni, A. B. Kasaeian, O. Mahian, and A.Z. Sahin, S. Wongwises, "Exergy Analysis of a Solar Organic Rankine Cycle with Square Prismatic Cavity Receiver", International Journal of Exergy, vol. 22, no. 2, pp. 103-124, 2017.
• Al-Merbati, A.S., Yilbas, B.S., and Sahin A.Z., "A Model Study for Cyclic Thermal Loading and Thermal Performance of a Thermoelectric Generator", International Journal of Energy Research, vol. 38, pp. 1351-1360, 2014.
• Al-Sharafi, A.Z. Sahin, T. Ayar, B.S. Yilbas, "Techno-Economic Analysis and Optimization of Solar and Wind Energy Systems for Power Generation and Hydrogen Production in Saudi Arabia", Renewable & Sustainable Energy Reviews, vol. 69, pp. 33-49, 2017.
• Al-Sharafi, B.S. Yilbas, A.Z. Sahin, T. Ayar, "Performance Assessment of Hybrid Power Generation Systems: Economic and Environmental Impacts", Energy Conversion and Management, vol. 132, pp. 418-431, 2017.
• Mohamed, S.A., Al-Sulaiman, F.A., Ibrahim, N.I., Zahir, M.H., Al-Ahmed, A., Saidur, R., Yilbas, B.S., and Sahin A.Z., "A Review on Current Status and Challenges of Inorganic Phase Change Materials for Thermal Energy Storage Systems", Renewable & Sustainable Energy Reviews, vol. 70, pp. 1072-1089, 2017.
• Ibrahim, N.I., Al-Sulaiman, F.A., Rahman, S., Yilbas, B.S., and Sahin, A.Z., "Heat Transfer Enhancement of Phase Change Materials for Thermal Energy Storage Applications: A Critical Review", Renewable & Sustainable Energy Reviews, vol. 74, pp. 26-50, 2017.
• Sahin, A.Z., Rehman, S. and Al-Sulaiman, F., "Global Solar Radiation and Energy Yield Estimation from Photovoltaic Power Plants for Small Loads", International Journal of Green Energy, vol. 14, no. 5, pp. 490-498, 2017.
• Mahian, O., Kianifar, A., Heris, S.Z., Wen, D., Sahin, A.Z., and Wongwises, S., "Nanofluids Effects on the Evaporation Rate in a Solar Still Equipped with Heat Exchanger", Nano Energy, vol. 36, pp. 134-155, 2017.
• Lari, M.O. and Sahin, A.Z., "Design, performance and economic analysis of a nanofluid-based photovoltaic/thermal system for residential applications", Energy Conversion and Management, vol. 149, pp. 467-484, 2017.
• Nouri, D., Fard, M.P., Oboodi, M.J., Mahian, O., and Sahin, A.Z., "Entropy generation analysis of nanofluid flow over a spherical heat source inside a channel with sudden expansion and contraction", International Journal of Heat and Mass Transfer, vol. 116, pp. 1036–1043, 2018.
• Lari, M.O. and Sahin, A.Z., "Effect of retrofitting a silver/water nanofluid-based photovoltaic/thermal (PV/T) system with a PCM-thermal battery for residential applications", Renewable Energy, vol. 122, pp. 98-107, 2018.
• M. Mudhafar, Sahin, A.Z., Bahaidarah, H. and Ouakad, H., "Optimization of Torque and Power Produced from a Small Scale Vertical Axis Wind Turbine", International Journal of Mechanical Engineering and Technology (IJMET), accepted for publication, 2018.
• Ahmed Z. Al-Garni, A.Z. Sahin, and W. G. Abdelrahman, "Performance comparison of a single slope solar still equipped with water heater and an external fan during summer and winter", Desalination and Water Treatment, vol. 139, pp. 14–22, 2019.
• Amin A. Mohammed, Hassen M. Ouakad, Ahmet Z. Sahin, and Haitham M.S. Bahaidarah, "Vertical Axis Wind Turbine Aerodynamics: Summary and Review of Momentum Models", ASME Journal of Energy Resources Technology, vol. 141, no. May 2019, pp. 050801-1-10, 2019.
• Ahmet Z. Sahin, Mohammed Ayaz Uddin, Bekir S. Yilbas, Abdullah Al-Sharafi, "Performance enhancement of solar energy systems using nanofluids: An updated review", Renewable Energy, vol. 145, pp. 1126-1148, 2020.
• Ahmed Z. Al-Garni, Ahmet Z. Sahin, and Salman Alfifi, "Summer and winter comparison of productivity improvement in a single slope solar still by using external mirrors", Desalination and Water Treatment, vol. 168, pp. 9-15, 2019.
• Amin A. Mohammed, M. Sunar, and Ahmet Z. Sahin, "Entropy Generation Rate Analysis in Pendulum Cart System Undergoing Damped Oscillation", International Journal of Exergy, vol. 31, no. 3, pp217-231, 2020.
• Amin A. Mohammed, Hassen M. Ouakad, Ahmet Z. Sahin, and Haitham M.S. Bahaidarah, "Parametric Study and Comparison of Aerodynamics Momentum-Based Models for Straight-Bladed Vertical Axis Wind Turbines", Arabian Journal for Science and Engineering, vol. 45, pp. 729-741, 2020.
• Amin A. Mohammed, Ahmet Z. Sahin, and Hassen M. Ouakad, "Numerical Investigation of a Straight-Bladed Vertical Axis Wind Turbine Performance Characterization using New Variable Pitch Control Scheme", ASME Journal of Energy Resources Technology, vol. 142, no. March 2020, pp 031302-1-9, 2020.
• Ahmet Z. Sahin, Kehinde G. Ismaila, Bekir S. Yilbas, and Abdullah Al-Sharafi, "A Review on the Performance of Photovoltaic Thermoelectric Hybrid Generators", International Journal of Energy Research, vol. 44, no. 5, pp. 3365-3394, 2020.
• Alireza Refiei, Reyhaneh Loni, G. Najafi, A.Z. Sahin, Evangelos Bellos, "Effect of use of MWCNT/oil nanofluid on the performance of solar organic Rankine cycle", Energy Reports, vol. 6, pp. 782-794, 2020.
• Ahmed Z. Al-Garni, Mohammed Aves and Ahmet Z. Sahin, "Experimental and Numerical Study of Solar Still with Varying Glass Cover Slopes", Desalination and Water Treatment, Accepted for publication, 2020.