Thermochemical Cycles for High-Temperature Solar Hydrogen Production

摘要

The greatly insolated "sunbelt" regions of the world include the southwestern United States,southern Europe,all of Australia,and broad regions of the developing world.1 The maximum direct insolation frequently reaches 1 kW m~2 in these regions.The reflection and concentration of direct insolation can be achieved by sun-tracking mirrors called collectors or heliostats.Some modern solar-concentrating systems have maximum concentration factors in the 1500- 5000 range and can provide high-temperature solar thermal heat(up to a few hundred kilowatts,and even tens of megawatts in the sunbelt regions).The concentrated solar radiation is focused upon a solar receiver,where maximum temperatures can exceed 1500 °C,depending upon the configuration of the solar concentrating system.The receiver efficiency depends on a concentration factor.