Solar water pumping

摘要: Abstract The principles of solar water pumping are briefly described. mechanical energy needed for may be produced by thermodynamic, or direct-conversion methods. In thermodynamic conversion a fluid with high internal is in collectors concentrators. the utilized Rankine-, Brayton-, Stirling-cycles specially designed devices. nature irrigation arid regions calls scattered stations, hence small pumps. These pumps mass and delivered to site. direct includes photovoltaic, themoelectric thermionic processes. With current prices cells photovoltaic seems economically competitive Rankine-cycle system power ranges below 5 kW, especially when both systems have imported developing country.