Method for testing an earth tap heat exchanger and associated apparatus
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United States of America Patent
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Oct 1, 1996
Issued Date -
N/A
app pub date -
Sep 1, 1995
filing date -
Sep 1, 1995
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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.
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