U.S. Interior Secretary Ken Salazar in late December approved—for the ninth time since October 2010—a solar power project to be built on federal lands. Solar Reserve’s Crescent Dunes is a 110-MW concentrating solar power (CSP) plant planned for siting on about 2,250 acres of public lands in Nevada. It will use advanced “power tower” technology developed in the U.S. by Pratt & Whitney Rocketdyne, a subsidiary of United Technologies Corp.
According to Solar Reserve, the facility also has the “ability to capture and store enough thermal energy each morning to provide electricity at full power all afternoon and for eight hours after sunset.” The plant will use mirror fields to focus solar energy on a tower receiver near the center of the array. Steam from boilers in the tower drives a turbine, which generates electricity. The power will be bought by NV Energy, which signed a 25-year power purchase agreement with Solar Reserve subsidiary Tonopah Solar a year ago.
Basic concept is air is trap below black body which absorb sun heating and because tower is so high created higher differential pressure so air is flow through turbine and moving generator.
from PEI Magazine
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