DX system having heat to cool valve
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United States of America Patent
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Jun 25, 2013
Grant Date -
Oct 22, 2009
app pub date -
Apr 21, 2009
filing date -
Apr 21, 2008
priority date (Note) -
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Abstract
Alternative means of inhibiting frosting in the interior heat exchanger of a DX system when switching from the heating mode to the cooling mode, plus an improved insulation and heat transfer means for vertically oriented sub-surface geothermal heat transfer tubing, as well as a means to protectively coat the sub-surface metal tubing of a DX system in a corrosive environment.
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