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Science and Technology 3⁄4 Content Standard E: • Abilities of technological design • Understandings about science and technology Science in Personal and Social Perspectives 3⁄4 Content Standard F: • Populations, Resources, and Environments • Science and technology in society History and Nature of Science 3⁄4 Content Standard G: • Science as a human endeavor • Nature of science Exploration and Drilling Many scientists, including geologists and hydrologists, chemical and civil engineers, and expert drilling technicians come together to collect and analyze information on the characteristics of a potential geothermal resource site. Sites are evaluated based on three primary criteria: heat content, fluid content, and permeability of the rock. Fortunately for geothermal explorers, hundreds of thousands of test holes have already been drilled all over the world by oil and gas companies. Researchers are able to use data from these deep wells to obtain information about the thermal energy in the area. These holes can also provide a way to use structural methods such as seismicity, gravity, and magnetic surveys to help determine the permeability beneath the surface. Electrical resistivity surveys can show how electricity flows through the rock and fluid beneath the surface and can help determine amount of available hydrothermal fluid. Once a site is identified as having geothermal potential, more exploratory wells are drilled and more data is collected and analyzed. Only after extensive checking and rechecking is a site recommended for development as one of the following energy conversion systems. Energy Conversion The technology used to convert geothermal energy into forms usable for human consumption can be categorized into four groups. The first three: dry steam, flash steam, and binary cycle, typically use the hydrothermal fluid, pressurized brine, or EGS resources to generate electricity. The fourth type, direct use, requires only hydrothermal fluid, typically at lower temperatures, for direct use in heating buildings and other structures. The addition of a small-scale electric heat pump into the system allows the use of low temperature geothermal energy in residences and commercial buildings. Technology DescriptionPDF Image | Geothermal Energy USDOE
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