An enhanced nested ground source heat pump underground heat exchange system

Abstract

The present invention relates to an enhanced nested ground source heat pump underground heat exchange system, comprising an outer tube buried in a rock and soil body, an inner tube arranged inside the outer tube, and a backfill material layer arranged between the outer tube and the rock and soil body, the inner tube and the outer tube are coaxially arranged, and an inner tube support mechanism is arranged between the inner tube and the outer tube, a liquid outlet pipe is arranged at the top of the inner tube, an inner tube inlet connected to the inside of the outer tube is opened at the bottom, and a liquid inlet pipe is arranged at the top of the side of the outer tube. Compared with the prior art, the present invention fixes the relative position of the inner tube and the outer tube by arranging an inner tube support mechanism between the inner tube and the outer tube, avoids the displacement of the inner tube in the outer tube, ensures the stability of the heat exchange process, and enhances the heat exchange efficiency; by arranging a backfill material layer and an outer tube with high thermal conductivity, the heat transfer coefficient between the circulating liquid and the surrounding rock and soil body can be significantly improved; by arranging an inner tube with a low thermal conductivity, the problem of "thermal short circuit" can be avoided.

Images