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Photographs of Typical Downhole Heat Exchangers and Heating

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					            PHOTOGRAPHS OF TYPICAL DOWNHOLE
              HEAT EXCHANGERS AND HEATING
             SYSTEMS, KLAMATH FALLS, OREGON
                                  Photographs by John Lund, Geo-Heat Center




Figure 1.   Drilling a residential geothermal well with   Figure 3.     Looking down on a typical 8-in. (20-cm)
            a cable drilling rig.                                       diameter well casing with a 2-in. (5-cm)
                                                                        diameter space heating loop and a 3/4-in.
                                                                        (2-cm) diameter domestic hot water loop
                                                                        used for a single residence.




Figure 2.   Placing a 2-in. (5-cm) diameter loop in a     Figure 4.     Heating loop with mud leg at the U-tube
            well.                                                       return.

12                                                                       GHC BULLETIN, SEPTEMBER 1999
Figure 5.    Installing the 3/4-in. (2-cm) diameter         Figure 7.   Commercial building heat system with two
             domestic hot water heating loop.                           DHE heating loops entering the building at
                                                                        the bottom center; city secondary water
                                                                        entering through the pressure relief and
                                                                        pressure reducing valves on the left center;
                                                                        expansion tank at the upper center; and a
                                                                        finned-tubed unit heater at the top. The
                                                                        pipes run to other unit heaters throughout
                                                                        the building.




                                                            Figure 8.   Residential heating system with a
                                                                        circulation pump. The DHE enters at the
Figure 6.    Heating system using forced air. DHE                       bottom right (large pipes) with the pump on
             pipes enter at bottom right: forced-air heat               the left; the thermostatically controlled
             exchanger at the top right (where a furnace                valve at the upper center; and the expansion
             used to be), expansion tank at top center,                 tank at the upper right.
             homemade shell-and-tube heat exchanger
             for the domestic hot water at the bottom
             center.

GHC BULLETIN, SEPTEMBER 1999                                                                                    13

				
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