Patent ID: 7841200
Filing Date: 2010-11-30
Classification: F24T,F25B,F28F,Y02E

Abstract:
1. At least one of a direct expansion heat pump system sub-surface refrigerant transport tubing containment pipe arrangement and a direct expansion heat pump system sub-surface refrigerant transport tubing arrangement positioned inside a well/borehole having an interior wall defined by naturally occurring sub-surface elements, the well/borehole extending along well/borehole axis, the arrangement comprising: at least one spacer device positioned between at least one of the sub-surface containment pipe and the sub-surface refrigerant transport tubing and the naturally occurring sub-surface elements, the spacer device being functional to space the at least one of the sub-surface containment pipe and the sub-surface refrigerant transport tubing away from the interior wall of the well/borehole, the spacer device being oriented substantially parallel to the well/borehole axis and extending only partially along the length of the at least one of the sub-surface containment pipe and the sub-surface refrigerant transport tubing; and a heat conductive grout fill material disposed between the at least one of the sub-surface refrigerant transport tubing containment pipe and the sub-surface refrigerant transport tubing, the at least one spacer device, and the naturally occurring sub-surface elements.