| US 7,578,140 B1 | ||
| Deep well/long trench direct expansion heating/cooling system | ||
| B. Ryland Wiggs, Franklin, Tenn. (US) | ||
| Assigned to Earth To Air Systems, LLC, Franklin, Tenn. (US) | ||
| Filed on Mar. 19, 2004, as Appl. No. 10/804,698. | ||
| Claims priority of provisional application 60/456335, filed on Mar. 20, 2003. | ||
| Int. Cl. F25D 23/12 (2006.01) | ||
| U.S. Cl. 62—260 [165/45] | 12 Claims |
| 1. A heat exchange system comprising:
a compressor operable in at least heating and cooling modes;
an interior heat exchanger;
an exterior, sub-surface, heat exchanger, the exterior heat exchanger being positioned at a lower elevation than the compressor;
refrigerant grade tubing connecting the interior heat exchanger and the exterior, sub-surface, heat exchanger with the compressor;
a system refrigerant charging the system, wherein the system refrigerant has a working pressure at least 33% greater than
a working pressure of R-22 refrigerant; and
wherein the compressor is configured to pressurize the refrigerant at a continuous operational pressure at least 33% greater
than the working pressure of R-22 refrigerant in both the heating and cooling modes.
|