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Spiral (‘Slinky’) closed loop systems These are variations on the horizontal loop systems. The slinky can be laid out in two ways, depending on the width of the trench that holds the pipe coils. The horizontal slinky layout consists of piping unrolled in overlapping circular loops that are laid flat or vertically in trenches of approximately the same width as the coil diameters. In the vertical slinky layout, coils stand upright in narrow trenches that are deep enough to accommodate the coil diameter and are covered with a sufficient depth of overburden so that the tops of the coils do not experience large seasonal temperature swings (Figure 29). Figure 29 Slinky ground loop diagram. Slinky systems depend on soil properties and depth of burial. Slinky coils are more prone to damage by backfill, and good backfilling techniques are required to avoid voids around the slinky. Advantages of slinky closed loop systems • Require less land area and less trenching than other horizontal loop systems. • Installation costs may be less. Disadvantages of slinky closed loop systems • Greater pumping energy needed than for straight horizontal loops. Vertical closed loop systems These configurations are considered when the available land area is more limited. Wells are drilled to depths of about 100 meters and then the closed loops are inserted into the vertical boreholes (Figure 30). 2010 GNS Science Report 2010/20 28PDF Image | Low Enthalpy Geothermal Energy
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