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Accueil du site → Doctorat → Autriche → Development of a photovoltaic system and harnessing of solar and wind energies for irrigation, heating and ventilation of a greenhouse

Universitaet fuer Bodenkultur Wien (1999)

Development of a photovoltaic system and harnessing of solar and wind energies for irrigation, heating and ventilation of a greenhouse

Nigm Mahmoud El Sayed

Titre : Development of a photovoltaic system and harnessing of solar and wind energies for irrigation, heating and ventilation of a greenhouse

Auteur : Nigm Mahmoud El Sayed

Akad. Grad : Thesis.Doctoral 1999

Université de soutenance : Institut fuer Land-, Umwelt- und Energietechnik ; Universitaet fuer Bodenkultur Wien

Résumé
This work was principally undertaken for the development of a photovoltaic (PV) system, as well as the harnessing of solar and wind energies for irrigation, heating and ventilation of a vegetable greenhouse at Seewinkel. With the aid of wind measurements, the conditions for sole or hybrid functioning of wind energy were investigated. From the experimental results, a planning concept for similar applications was developed The basis for the work resulted from data acquired over a period of two seasons. As shown by the results, the amount of energy produced by the solar system is much higher than that of the wind generator (of 450 W maximum output) during the cropping period. The maximum wind energy harnessed represented about 37 % of the total energy output. One can conclude from the results that the wind energy yield at the location in summer is especially good, in spite of the fact that this energy availability is generally much lower than in winter. One can therefore conclude from the results that in this location, an all-year round combined solar and wind energy utilisation for operation of the system is reasonable. The specific water requirements for tomatoes and paprika during the main growth period were met, especially in the 1997 season, after expanding the PV area. Metering of the required water quantity over different daily pumping stages and their periods was accomplished with a timer. This simple automation of the irrigation system lends itself a large economical advantage since labour needs can be cut. Two heating systems were investigated during the early growth stages of the crops. Resistance heating (using a coil), whose sole operation would have been too risky, could be used to back up a gas heater. The gas heater (of 25 kW nominal power) with automatic ignition was successfully used m the field trials. With reference to energy costs, the gas heater would be chosen m preference to an oil heater, since the electrical energy need of the former was sufficiently met by the PV facility. Further experiments with a forced ventilation system were undertaken during the summer period, so that too high temperatures and humidity in the tunnels could be eventually avoided. The energy required for operation of the pump, as well as that for the fan was sufficiently available. Local climatic measurements within the tunnel have shown positive effects

Mots clé : Solarenergie / Windenergie / Bewaesserung / Heizung / Belueftung / Gewaechshaus — solar energy / wind energy / irrigation / heating / ventilation / green house

Présentation : Österreichische Dissertationsdatenbank

Page publiée le 11 juin 2008, mise à jour le 13 mars 2019