Showing papers in "Renewable Energy in 1998"

TL;DR: Results indicate the viability of this approach for spatial modeling of solar radiation, and introduce a neural network technique for the estimation of global solar radiation.

TL;DR: The results on a testing data indicate that the neural network approach outperforms the AR model as indicated by the prediction graph and by the root mean square errors.

TL;DR: In this paper, a novel approach using an artificial neural network was used to develop a model for analyzing the relationship between the Global Radiation (GR) and climatological variables, and to predict GR for locations not covered by the model's training data.

TL;DR: The evaluation of wind energy potential for the island of Crete, Greece and the financial analysis of a wind park installation are presented as a case study.

TL;DR: In this article, the effect of using different absorbing materials in a solar still, and thus enhancing the productivity of water, was studied, and it was shown that using an absorbing black rubber mat increased the daily water productivity by 38%. Using black ink increased it by 45%.

TL;DR: In this paper, a thorough literature investigation into the use of phase change materials for energy saving and management in greenhouses was carried out, and related studies were classified in three most-used phase change material groups based on salt hydrates, paraffins and polyethylene glycol.

TL;DR: In this article, the authors have shown that solar drying can be an effective means of food preservation since the product is completely protected during drying against rain, dust, insects and animals.

TL;DR: In this paper, the basic concepts, systems design, and the latest developments in (sensible and latent heat) thermal energy storage are reviewed. And the problems encountered during the systems operation are highlighted.

TL;DR: In this article, a single basin solar still (SBSS) is designed and constructed, and a simple transient mathematical model is presented for the still, based on analytical solution of the energy-balance equations for different parts of the still.

TL;DR: In this paper, the governing parameters for flows generated by heat transfer from solar cell modules to air gaps are discussed from measurements in mock-ups of ventilated facades and roofs, where the heat transmitted from the solar cells to the air have been mimicked by the use of heating foils.

TL;DR: In this paper, a typical meterological year for Nicosia, Cyprus was generated from available hourly meteorological data recorded during the period 1986-1992, using the Filkenstein-Schafer statistical method.

TL;DR: In this article, a system sizing program using FORTRAN language is developed to minimize the cost of the PV system according to the PV array area and storage battery and the pre-operating time of the diesel generator.

TL;DR: In this article, a preliminary campaign of validation of a simulation software CODYRUN has demonstrated the misinterpretation of the radiative exchanges of long waves between the building and its environment.

TL;DR: In this article, a reverse osmoisis (RO) plant supplied by a photovoltaic (PV) power supply has been installed at the island of Gran Canaria.

TL;DR: In this paper, the thermal performance of a conventional tubeless collector is improved by inserting porous substrates at the inner side of the collector absorber plate, which improves the convective heat transfer coefficient between the absorber and the fluid.

TL;DR: In this paper, a Maximum Power Point Tracker (MPPTT) using a step up converter with a current locked loop was developed, which showed an improvement in the output power by 22.5% (average) over a wide range of solar irradiation in a day.

TL;DR: In this paper, an investigation of the technical feasibility and a cost benefit analysis of a brackish water small-scale desalination plant in a rural area has been carried out, which revealed the best socioeconomic performance for a reverse osmosis directly coupled with a photovoltaic-system.

TL;DR: In this paper, the performance of a pilot solar Multi Effect Humidification (MEH) Desalination system in Fuerteventura, Canary Islands, had been measured and analyzed in detail by the ZAE Bayern since 1992.

TL;DR: In this paper, a suitable Weibull distribution is generated based on the data obtained for a duration of one complete year at a costal location in northeastern Saudi Arabia, where two horizontal-axis type of wind energy conversion systems which operate at fixed rpm are considered and a model of quadratic power output function is used.

TL;DR: In this article, an environmental chamber has been used to compare the effectiveness of mixing and displacement ventilation in terms of heat and contaminant removal, and the results showed that displacement ventilation is more energy efficient than a mixing system.

TL;DR: In this paper, the effect of the change of the absorber shape factor on the collector performance was studied, and the optimal angle of the triangular collector was determined for all types of solar air heaters by changing the value of the shape factor.

TL;DR: In this article, the authors presented a parameteric analytical study of roof solar chimney coupled with wind cooled cavity using spread-sheet computer program, which is able to create an air flow rate up to 1.6 kg/s at a mean incident solar radiation of 850W/m2.

TL;DR: Displacement ventilation and chilled ceiling systems have been promoted as being ‘greener’ alternatives to other common forms of air conditioning system as discussed by the authors, and they have been viewed by some of the building services industry as a welcome departure from the traditional ‘North American’ systems of AC, and could be viewed as a more suitable alternative for use in the moderate climatic conditions of the UK.

TL;DR: The Abu Dhabi solar desalination plant started operation in September 1984 and is still operating until now as mentioned in this paper, which consists of three subsystems: the solar collector field, the heat accumulator and the seawater evaporator.

TL;DR: In this article, an analytical study of the evaporation rate in two types of forced convection greenhouse driers, the single and the double chamber systems, is presented, and a performance parameter defined to compare both driers and its dependence on the operational variables is studied introducing the concept of the characteristic function.

TL;DR: In this article, the authors conducted a research investigation to provide a firm scientific understanding of dynamic insulation and found that the energy saving produced by dynamic insulation alone is small relative to that obtained in conjunction with conventional air heat recovery methods.

TL;DR: In this paper, the authors investigated the method of combining photovoltaic cells with the transpired solar air heater, constructed prototypes, measured the combined electrical and thermal energies produced and compared the results with single function reference panels.

TL;DR: In this article, a number of years data on wind speed in Aden has been studied and presented and a statistical analysis was carried out from which the annual wind speed was found to be 4.5 m/s and most of the time the wind speed is in the range of 3.5m/s.

TL;DR: The results obtained in the evaluation of a 2 kWp grid-connected photovoltaic system in Malaga (Spain) are shown in this paper, where the energy losses of the system and the most relevant performances of the installation have been quantified.

TL;DR: In this paper, the Ministry of Water Resources efforts to exploit the Sultanate's renewable energy were shown. But the water from Heelat Ar Rakah camp's well was found unfit for consumption due to high concentrations of fluoride and hydrogen sulphide (H 2 S) gas.