Method for testing an earth tap heat exchanger and associated ap

Details Method for testing an earth tap heat exchanger and associated ap Method for testing an earth tap heat exchanger and associated ap

1995-09-01

1996-10-01

Bennett, Henry A:

Refrigeration

Structural installation

Geographic, e.g., subterranean feature

165 45, 165DIG2, F28F 1100, F24J 308

Patent

active

055602207

ABSTRACT:
A method for identifying a leaking earth tap heat exchanger includes measuring an electrical resistance between the electrically conducting tubing of the earth tap heat exchanger and the surrounding soil or water to determine if the electrically insulating layer has an undesired opening in a portion thereof thereby exposing an adjacent portion of the electrically conducting tubing to the soil or water as indicated by a relatively low electrical resistance. Each earth tap heat exchanger preferably comprises electrically conducting tubing having an electrically insulating layer covering an exterior thereof. The method may also be used to test the integrity of the electrically insulating layer to avoid corrosion as may be caused by direct contact between metallic tubing and adjacent soil or water. Apparatus aspects of the invention are also disclosed.

REFERENCES:
patent: 3882937 (1975-05-01), Robinson
patent: 4171721 (1979-10-01), Movick
patent: 4255936 (1981-03-01), Cochran
patent: 4286651 (1981-09-01), Steiger et al.
patent: 4325228 (1982-04-01), Wolf
patent: 4466481 (1984-08-01), Wilson et al.
patent: 4512156 (1985-04-01), Nagase
patent: 4573327 (1986-03-01), Cochran
patent: 4665716 (1987-05-01), Cochran
patent: 4671351 (1987-06-01), Rappe
patent: 4714108 (1987-12-01), Barry
patent: 4970902 (1990-11-01), Ninomiya
patent: 5022459 (1991-06-01), Chiles et al.

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