A rig, the rig useful in well operations, the rig having rig structure above the earth, and heat transfer loop apparatus connected to the rig for supplying heat transfer fluid for use on the rig, either from a loop or loops with portion(s) in water or portion(s) in earth, or both.
RELATED APPLICATIONS
This is a division of U.S. application Ser. No. 10/459,331 filed Jun. 11, 2003 (U.S. Pat. No. 6,896,054; May 24, 2005), which is a continuation-in-part of U.S. application Ser. No. 10/047,944 filed Jan. 14, 2002 (U.S. Pat. No. 6,585,067; Jul. 01, 2003) which is a continuation-in-part of U.S. application Ser. No. 09/504,172 filed Feb. 15, 2000, (U.S. Pat. No. 6,267,172; Jul. 31, 2001) and U.S. application Ser. No. 09/620,954 filed Jul. 21, 2000 (U.S. Pat. No. 6,338,381; Jan. 15, 2002)--all said applications and patents incorporated fully herein for all purposes and from which the present invention claims priority under the Patent Laws.
A heat and cooling system having an indoor air coil subcircuit, an outdoor air coil subcircuit, a geothermal subcircuit, and a control system for selectively operating the system in air-to-air heating, air-to-air cooling, geothermal heating, air-to-air defrost (optionally) and geothermal defrost modes. The various subcircuits may be connected to one another in parallel. The heating and cooling system may include a control system that permits refrigerant to be selectively routed through any two of the heat exchangers to provide the various modes of operation. In one embodiment, the control system may generally include a circuit having a single reversing valve, a plurality of check valves, a plurality of solenoid valves and a plurality of expansion devices.
