Browsing by Author "Alsuhaibani, Z."

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Citation - WoS: 18
Citation - Scopus: 20
Estimating and comparing the exergetic solar radiation values of various climate regions for solar energy utilization
(Taylor & Francis Inc, 2014) A. Hepbasli; Zeyad A. Al-Suhaibani; Hepbasli, A.; Alsuhaibani, Z.
Energy resources and their utilization intimately relate to sustainable development. In attaining sustainable development increasing the energy efficiencies of processes utilizing sustainable energy resources plays an important role. The utilization of renewable energy offers a wide range of exceptional benefits. There is also a link between exergy and sustainable development. Exergy analysis has been widely used in the design simulation and performance evaluation of various energy systems as well as renewable energy sources. In this regard determination of exergy of solar radiation is very crucial for various solar energy-related applications and is based on the relative potential of the maximum energy available from radiation. The efficiency factor limiting the gain of the maximum useful energy from the solar radiation is significantly similar to that of the Carnot efficiency for the heat engines. The main objectives of this study are two-fold namely (i) to comprehensively review various solar exergy models used in solar energy-related applications and (ii) to determine the solar exergetic values for some regions of Saudi Arabia and Turkey which are taken as two illustrative examples to which various models have been applied and compared. In this regard the ratios of solar radiation exergy to solar radiation energy (exergy-to-energy ratio) for northeastern Saudi Arabia are calculated to be on average 0.933 for both approaches of Petela and Spanner and 0.950 for Jefer's approach at outside air temperatures between 16.18 and 33.01°C. These ratios for Izmir Turkey are obtained to be on average 0.935 and 0.951 for the same approaches at a temperature range of 15-22°C respectively. The values found using Jefer's approach appear to be 2% larger than the approaches of Petela and Spanner while those are very close to the value of 0.95 proposed by Nobusawa. © Taylor & Francis. © 2014 Elsevier B.V. All rights reserved.
Citation - WoS: 5
Citation - Scopus: 8
Future Aspects of Geothermal Energy in Saudi Arabia
(TAYLOR & FRANCIS INC, 2013) Z. Alsuhaibani; A. Hepbasli; Hepbasli, A.; Alsuhaibani, Z.
Geothermal energy seems to be a clean proven and reliable resource for supplying the needs of a sustainable society and helping to improve the global environment. Although the studies on geothermal resources exploration in Saudi Arabia were started in 1980 since then any serious geothermal projects have not been undertaken excepting to the availability of some potentially resources-rich geothermal locations. The first in situ determination of the thermal properties of the underground soil required for the design of borehole heat exchangers was reported in 2009 for the first time. In this study future aspects of geothermal energy were treated first. The exergetic aspects of some geothermal resources available were then explained using a specific exergy index. Finally the results obtained were given and discussed. It is expected that some barriers hindering the utilization of geothermal resources in Saudi Arabia will be overcome and geothermal energy utilization will become a viable option in the near future.