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C004/9110 Rights Managed

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Credit: LARRY LANDOLFI/SCIENCE PHOTO LIBRARY

Caption: A 'green energy' home in New Hampshire with photovoltaic cells on the roof (producing electricity from the sun) and thermal solar heaters near the ground (heating hot water). The thermal solar heaters are of the 'evacuated tube solar collector' type, which absorb solar radiation and convert it into heat. The heated pipes conduct the heat from the solar tubes up to the 'header'. Water is slowly circulated through the header, by way of intermittent pump cycling, and each time the water circulates through the temperature is raised about 9-18 degrees F. Throughout the day the water in the storage tank is gradually heated.

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Keywords: alternative energy, energy, environmentally friendly, green energy, home, homes, house, houses, modern, natural energy, panels, renewable, residential, roof, roofs, solar hot water, solar radiation, technology, thermal heat, thermal solar heat, thermal solar heating

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