| 摘要 |
A direct expansion geothermal heating/cooling system wherein the interior air handler is sized via 100 cubic inches of interior heat exchange tube volume per 12,000 BTUs of maximum design capacity; wherein the thermal expansion valves are sized to the tonnage capacity of the air handler's design; wherein the subterranean heat exchange tubing consists of +E,fra 1/8+EE inch to +E,fra 3/16+EE inch outside diameter tubing with outside diameter to tube length ratios of between 1/6,400 and 1/9,600, and where the interior diameter to length ratios are between 1/9,411 and 1/18,462; wherein the interior volume of the subterranean heat exchange tubing is within 1% of the interior volume of the interior air handler's heat exchange tubing; wherein at least 40 square feet of subterranean heat exchange tubing is proportionately exposed to a 500 square foot area of earth per 12,000 BTUs of system design capacity; wherein one or more of the subterranean heat exchange tubes are finned, with fins spaced at least +E,fra 1/4+EE inch apart; wherein the compressor's design capacity is between 20% and 33.33% less than the interior air handler's design; where the receiver and accumulator are about 20% to 50% smaller than conventionally sized; and where the geothermal heat exchange tubing is accessed via dual, or multiple, distributors and/or is installed in a vertical or angled slot from 1 inch to 1 foot wide, which is backfilled with powdered stone, heat conductive fill, flowable fill, concrete or the like.
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