Geothermal direct expansion heat pump system

Details Geothermal direct expansion heat pump system Geothermal direct expansion heat pump system

1996-04-19

1997-09-30

Doerrler, William

Refrigeration

Structural installation

Geographic, e.g., subterranean feature

165 45, F25D 2312

Patent

active

056716087

ABSTRACT:
A geothermal direct expansion heat pump system wherein subterranean heat exchange tubes have an internal diameter to length ratio of between 1/4000 and 1/6000, with 5 tubes per ton of BTU capacity; where the interior air heat exchange tubes have 50% of the interior volume of the subterranean tubes; where the thermal expansion valve is sized to match the interior air handler capacity; where the receiver holds 75% to 95% of the total refrigerant volume; where a pump down sequence is employed on system shut down; where an oil trap is installed at the vapor line existing the subterranean heat exchange tubes; and where 4 refrigerant cut-off/isolation valves are installed for service convenience.

REFERENCES:
patent: 4402190 (1983-09-01), Reid
patent: 4688717 (1987-08-01), Jungwirth
patent: 4920757 (1990-05-01), Gazes et al.
patent: 5025634 (1991-06-01), Dressler
patent: 5136855 (1992-08-01), Leanarduzzi
patent: 5224357 (1993-07-01), Galiyano et al.
patent: 5461876 (1995-10-01), Dressler
The Trane Company, Trane Reciprocating Refrigeration Manual, 1966; pp. 74-75.
The Goodheart-Wilcox Company, Inc., Modern Refrigeration and Air Conditioning, 1955; pp. 815-816, 822, 108-113.

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