Heat Transfer Refrigerant Transport Tubing Coatings and Insulation for a Direct Exchange Geothermal Heating/Cooling System and Tubing Spool Core Size

A direct exchange heat pump system for use with a well extending into a sub-surface environment, the direct exchange heat pump system comprising:

• an exterior heat exchanger including a liquid transport line disposed in the well and extending substantially vertically;
• a refrigerant disposed in the liquid transport line;
• and
• a first layer of insulation surrounding an upper portion of the liquid transport line, the upper portion including approximately ⅓ of an overall length of the liquid transport line, plus or minus approximately 20%.

A direct exchange geothermal heating/cooling system for use with a well extending into a sub-surface environment, comprising:

• an exterior heat exchanger including a liquid transport line disposed in the well and extending substantially vertically;
• a refrigerant disposed in the liquid transport line;
• and
• a first layer of insulation surrounding an upper portion of the liquid transport line, the upper portion including approximately ⅓ of an overall length of the liquid transport line, plus or minus approximately 20%, the first layer of insulation having a thickness of at least approximately 0.10 inches (0.25 cm), plus or minus 20%, being formed of a first insulation material comprising a solid-state material;
• and
• a second layer of insulation disposed around the first layer of insulation, the second layer of insulation extending along a top portion of the liquid transport line defined as either approximately 15% of the overall length of the liquid transport line, plus or minus about 20% of that approximately 15% of the overall length of the liquid transport line, or the upper approximately 45 feet of the liquid transport line.

A direct exchange geothermal heating/cooling system for use with a well extending into a sub-surface environment, comprising:

• an exterior heat exchanger including a liquid transport line disposed in the well and extending substantially vertically;
• a protective coating disposed on the exterior surface and having a thickness of between approximately 0.01 inches (0.025 cm) and 0.03 inches (0.08 cm), plus or minus approximately 20%, the protective coating being formed of a solid state material;
• and
• a layer of grout material surrounding the protective coating.