Patent ID: 7146823
Filing Date: 2006-12-12
Classification: F24T,F25B,Y02E

Abstract:
1. A direct expansion geothermal heat pump sub-surface, combination horizontally oriented and vertically oriented, refrigerant fluid transport tubing/line installation system comprising providing sub-surface, refrigerant transport, tubing/line segment that decreasing sizes when operating in the cooling mode and tubing/line segment that increasing sizes when operating in the heating mode, with the smallest segment size tubing/line extended into and out of, in a loop, a vertically oriented well/borehole; and wherein the smallest size tubing/line segment size extended into and out of a vertically oriented well/borehole, in a loop, has a loop that extends to a depth equal to at least 25% of the total combined lengths of all the horizontally oriented segments.