A CLOSED-LOOP geothermal energy system was recently installed in a school in Lancaster, Pennsylvania by local drilling contractor Reith Brothers.
The system consists of series of pipes, a heat exchanger and ductwork built into the structure. In the winter, heat from the earth is collected in the exchanger and distributed into the building.
In the summer, heat absorbed from the air is carried back to the earth to cool. The system is also used to heat water.
The US Environmental Protection Agency has endorsed the system as a viable alternative for heating and cooling homes and businesses.
Legislation is being considered that would require geothermal heat loops in all government financed building projects.
For the geothermal pipes at the school Reith Brothers used Schramm T450 and T660 rigs fitted with Numa Patriot 60 downthe-hole hammers to drill 240 vertical holes through hard limestone down to 122m.