Showing papers in "Renewable Energy in 1992"

TL;DR: In this paper, the authors analyzed wind speed data for 30 locations in Nigeria and determined the mean maximum power extractable from two hypothetical aerogenerators, respectively, for electricity generation and water pumping in rural areas.

TL;DR: The least square linear regression analysis was used for the eight cities to obtain the relationship between the monthly average daily global radiation and sunshine duration data as mentioned in this paper, which can be used for any solar energy application in Malaysia.

TL;DR: In this paper, the authors describe an activated carbon + methanol pair of solar ice makers with a collector and condenser in a unique component: the collecto-condenser.

TL;DR: In this article, a feasibility study for the use of solar Parabolic Trough Collectors for hot water production in Cyprus was carried out for two types of applications, domestic and hotel.

TL;DR: An overview of battery systems commonly used in PV installation, as well as several new options which are found suitable or have been modified suitably to meet PV energy storage requirements is given in this article.

TL;DR: In this article, a high-efficient power electronic converter, for converting the output voltage of a solar panel, or wind generator, to the required DC battery bus voltage has been realized.

TL;DR: In this article, the results of a detailed investigation about the accumulated energy consumption (hidden energy) in the manufacturing and construction of photovoltaic power plants and corresponding data about the CO2-emissions caused by PV power generation are presented.

TL;DR: In this article, the vacuum thermal evaporation technique was used to grow iron thin films on heated glass substrates, which were converted into iron pyrite FeS2 phase identified by X-ray study.

TL;DR: In this paper, an experimental study was conducted to evaluate and compare the use of a diesel fuel supplement, specifically a 25/75% and a 50/50% blend of waste olive oil and commercial diesel fuel, in a four-stroke, DI (Direct Injection) diesel engine and a fourstroke, IDI (Indirect Injection), having a swirl-combustion chamber.

TL;DR: In this article, the feasibility of incorporating a continuously variable mechanical transmission between a wind turbine and an electric generator is explored, which allows the turbine to operate at maximum efficiency levels and the generator to produce electric power at a desired frequency without using other devices.

TL;DR: In this paper, the optimum flow channel depth and mass flow rate in 10 different designs of solar air heaters have been obtained, including flat absorber type with and without cover glazings, single, double and triple pass etc.

TL;DR: In this article, the conversion of wind energy into electrical energy for feeding into the supply grid is studied, by using an induction generator with wound rotor and electronic rotor cascae with supply commutated inverter.

TL;DR: In this paper, the performance of the solar powered ice-makers tested in Agadir, Morocco, as described in [1], is studied, and experimental data are sufficient for establishing a statistical correlation between heat extraction and meteorological parameters: insolation, diurnal and nocturnal temperatures.

TL;DR: In this paper, the performance of a non-storage, continuous, solar operated absorption refrigeration cycle is described based on the operation of the unit when there was enough solar energy to power its generator.

TL;DR: Using a numerical integration (Lowtran 6 code) stopped at several arbitrary base altitudes, in association with measurements from sounding balloons, clear sky radiation is determined as a function of the altitude parameter as mentioned in this paper.

TL;DR: In this article, a new correlation was developed to predict monthly mean daily global radiation on horizontal surfaces for locations with latitudes between 60°N and 70°N, where the suggested equation expressed global radiation in terms of per cent possible sunshine.

TL;DR: In this article, a thermal analysis of a modern house and a traditional Yemeni adobe house was carried out to bring out the appropriateness of traditional architecture through the results of thermal analysis, where a major saving of energy consumption can be achieved.

TL;DR: In this article, a statistical assessment of the accuracy of 12 solar radiation models for five meteorological stations in the Gulf Arabian states namely Abu Dhabi, Bahrain, Doha, Kuwait and Riyadh, is presented.

TL;DR: In this article, a preliminary assessment of the performance and economic potential of a hybrid energy system (wind/diesel) power system which includes a variable speed diesel generator is provided.

TL;DR: The model offers an effective way to predict the gas production from full-scale digesters running at 35°C, although constants derived from one mode of running should not be used for the other.

TL;DR: In this paper, a statistical analysis of the solar daily global irradiation for Genoa, Italy, has been carried out using a 9-year time series, where the frequency distribution of the fluctuations in the daily values of the time series about the mean, normalized by the standard deviation has been transformed into a standard Normal distribution.

TL;DR: In this paper, a two axis tracking system is described for the focussing of sunlight in paraboloid-type solar reflectors used in solar thermal devices like solar cookers.

TL;DR: Theoretical efficiencies and thermal behavior of all-glass Evacuated Tube solar Collectors with an Internal Absorber Film (ETCIAF) are compared and contrasted with the traditional design of allglass ETCEAF, using the absorber film on the external surface of the inner tube as discussed by the authors.

TL;DR: In this article, a graph of collector efficiency versus tube spacing was obtained experimentally for a flat-plate copper collector and the graph was found to be approximately linear, from its slope, the optimum tube spacing for maximum cost-effectiveness was estimated, using actual material costs.

TL;DR: In this paper, the wind data of several measurement sites in Somalia have been analyzed in order to characterize the wind potentiality in relation to the type of wind generators; these have been defined by a simple model of the system output.

TL;DR: In this article, the Eppley Ultraviolet Radiometer was used to measure the UV-B radiation over Bahrain for the first time between 1985 and 1989 using the wavelength interval 295-385 nm.

TL;DR: In this article, correlation constants a and b were determined for many stations in Benin using: • - a graphical relationship between the average annual relative sunshine SS / SS ′o and the constants (Frere's model).

TL;DR: In this paper, the authors compared the Rayleigh distribution and real variable efficiency depending on the mean wind speed in comparison with Betz limits and 100% efficiency, and concluded that the results are about four times higher with the Betz efficiency and seven times higher than with 100% energy efficiency by selected wind speed.

TL;DR: In this article, a comparison between the wind and solar power is made, and it is shown that the mean attainable wind power is 70.6 W/m2, while the mean achievable solar power through photovoltaic cells is 90 W /m2 (using 18% efficiency).

TL;DR: In this paper, Kudish et al. compared the performance of free and forced condenser systems in solar desalination units and showed that the efficiency of the existing system is improved by introducing a thermally insulated flat plate to separate the evaporation zone from the condensation zone.