02576cas a2200253 a 450000500170000000800410001703500150005810000370007324500950011026000520020530000100025749000270026750001560029450200580045052014470050865000340195565000220198970000300201170000430204170000560208471000580214081000590219885600650225720260818214234.0110905s1981    th uu|m rtt   0|  a1eng d  a.b106078331 aEaswarakhanthan, Thirunavukarasu10aSmall scale photovoltaic water pumping :bdirect-coupled systems driving centrifugal pumps  aBangkok :bAsian Institute of Technology,c1981  a80 p.1 aThesis ;vno. ET-81-10  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1981  aA theoretical study, on photovoltaic pumping is undertaken to establish the most efficient direct- coupled system and to evaluate the relative merits of a system with a maximum power point tracker (MPPT) as an interfacing device,  over the direct-coupled system. An experimental study on the performance of a direct-coupled system is carried out by setting up an installation of solar  panels, direct-current permanent magnet motor and centrifugal pump. Using mathematical models of the system components, it is shown that  the direct- current permanent magnet motor with centrifugal pump provides the best adaptation to the direct-coupled system. Further, a comparative simulated performance study shows that the system with MPPT starts pumping earlier than the direct- coup.1ed system and that it could pump even during cloudy atmospheres.  Moreover, the simulation of daily flow, throughout a year, indicates that with MPPT, t he yearly flow increases by around 25% . The effect of an eventual sun tracking system is also considered in the theoretical studies. The experimental study carried out on t h e direct-coupled sys tern concludes that the system efficiency is between 3.2 and 4.1% for heads between  4.5 and 5.5 m, with the illumination levels above 600 W/m2 . The parameters of the regression models are obtained for the working curve of the system and for the characteristics of the pump, The performance curves are also  given. 0aPhotovoltaic power generation 0aCentrifugal pumps1 aFollea, D., eChairperson1 aSaunier, G.Y., eExamination committee1 aWalter, Despiegelaere, Ir., eExamination Committee2 aThe Government of United Kingdom, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. ET-81-10  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B21578