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Characteristic curves of water supply systems
Photovoltaic pumping systems can be analyzed by studying the behavior of each component or groups of components. Alternatively, and this is the approach used in this work, their behavior can be described as a single relationship between water flow rate (output) and collected solar radiation (input), called characteristic curve. A method is described to obtain that curve, combining laboratory indoor or outdoor tests with the knowledge of the water well behavior. A practical example is given. The second part of the paper discusses the predictive capability of that procedure. With that purpose, two sets of measurements were performed. With the first one, the characteristic curve of a progressive cavity pump is determined. During a second set of measurements, the water volume pumped along several days, is measured. By using the characteristic curve and the sequence of solar radiation profiles recorded during the second set of measurements, the water volume is estimated and compared with measured values. A good agreement is verified. The use of the characteristic curve turns out to be an efficient tool to simulate PV pumping systems when the stochastic nature of the solar resource and the consequent variations of the water well level are considered.
Characteristic curves of water supply systems
Photovoltaic pumping systems can be analyzed by studying the behavior of each component or groups of components. Alternatively, and this is the approach used in this work, their behavior can be described as a single relationship between water flow rate (output) and collected solar radiation (input), called characteristic curve. A method is described to obtain that curve, combining laboratory indoor or outdoor tests with the knowledge of the water well behavior. A practical example is given. The second part of the paper discusses the predictive capability of that procedure. With that purpose, two sets of measurements were performed. With the first one, the characteristic curve of a progressive cavity pump is determined. During a second set of measurements, the water volume pumped along several days, is measured. By using the characteristic curve and the sequence of solar radiation profiles recorded during the second set of measurements, the water volume is estimated and compared with measured values. A good agreement is verified. The use of the characteristic curve turns out to be an efficient tool to simulate PV pumping systems when the stochastic nature of the solar resource and the consequent variations of the water well level are considered.
Characteristic curves of water supply systems
Kennzeichnende Betriebskurven von Wasserversogungspumpen
Vilela, O.C. (author) / Fraidenraich, N. (author) / Galdino, M.A. (author)
2001
5 Seiten, 5 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
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