A refrigerant in a vapor compression cycle provides the
heating or cooling for the house. Figure 4 is a schematic diagram
of the system operating in cooling mode. A warm glycol
solution is pumped into the Wells in the colder ground, which
reduces the temperature of the solution. The cooled glycol
solution then goes to the compressor unit where it passes
through a heat exchanger and cools and condenses the refrigerant fluid.
The warm glycol solution then returns to
the pump. The cool, liquid refrigerant goes through an expansion
device that decreases the pressure and the temperature
of the refrigerant. The cold refrigerant passes through another
heat exchanger where it evaporates and cools the house air.