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Pumping Water for Irrigation Using Solar Energy Page 5 Figure 4. 2 photovoltaic modules, one cell shaded (l), both in full sun (r) (top l.); 2 7-cell modules - irradiance level .25 kw/m2 (bottom); 2 7-cell modules - irradiance level .10 kw/m2 (top r.) WATER VOLUMES PUMPED PER DAY The volume of water which a photovoltaic-powered pump is able to produce is related to the irradiance level which it receives throughout the day. On October 7, 1989, high levels of irradiance were available throughout the entire day and the photovoltaic system pumped 20,180 gallons of water against a static head of 2.44m (8ft) (Figure 6). On January 6, 1990, clouds blocked the sun’s rays over a large part of the day, and the system pumped only 1,655 gallons of water (Figure 7). An advantage of using direct solar radiation as a power source for irrigation is that it is available at the site of application without the employment of a distribution system (Halcrow and Partners, 1981). Plant water demand and the quantity of water pumped by a photovoltaic powered water pumping system are both directly correlated to daily solar insolation.7 To ascertain the area for which the system used in this demonstration could replace daily potential evapotranspiration (ETp), ten years of historical weather data were used to calculate the theoretical daily fluid power output of the system and the dailyPDF Image | Pumping Water for Irrigation Using Solar Energy
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