04/01946 Date palm fibre reinforced composite as a new insulating material: Al-Sulaiman, F. A. International Journal of Energy Research, 2003, 27, (14), 1293–1297
- Publisher
- Elsevier Science
- Year
- 2004
- Weight
- 341 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0140-6701
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✦ Synopsis
This case study highlights the importance of taking into consideration diurnal variations of wind velocity for wind energy resources assessment. Previous studies of wind energy distribution that are based on the two-parameter Weibull density function have so far neglected to consider time of day fluctuations in wind speed, instead concentrating primarily on seasonal deviations. However, this has serious implications where such a wind energy model is the underpinning of calculations for the potential power production from a wind turbine and in particular where the timing of the energy output is essential to meet electricity loads. In the case of Grenada the energy output from a wind turbine during the day is approximately two times the output at night thereby fluctuating enormously around the seasonal mean distribution. When this is not taken into account the economic and technological viability of a wind turbine project may be overestimated or not even be identified. This work shows how a wind energy resources assessment based on the Weibull distribution model can be done and how the power output of a horizontal axis turbine is calculated. An analysis of the recorded wind data confirms the application of the Weibull density function as a suitable tool for modelling wind regimes.
04/01939 Investigation of Greek wind energy market timeevolution
Kaldellis, J. K. Energy Policy, 2004, 32, (7), 865-879. An integrated, time-depending computational frame concerning the economic behaviour of wind energy applications in Greece is developed. This frame is accordingly used to analyse the local wind energy market situation during the last 15 years. According to the results obtained, one may-on pure economic basis-explain the evolution of wind energy applications in the three major Greek sections presenting interest for wind power stations construction, i.e. the small medium sized Aegean Archipelago islands, the Crete Island and the windy sites of mainland. Furthermore, the proposed model predicts no additional wind parks in the Aegean Sea Islands and Crete. The only solution to this negative evolution is the development of additional energy storage systems, e.g. wind-hydro stations. On the contrary, the Greek mainland opportunities in selected windy sites are more encouraging under the precondition of strengthening the existing electricity transportation networks and properly handling the increasing public annoyance towards new large wind turbines erection in relatively few closed areas.