A buried pipe for ground source heat pump

Abstract

The invention relates to a buried pipe for a ground-source heat pump, and belongs to the field of ground-source heat pumps. The buried pipe comprises a vertically-arranged pipe body, a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are arranged in the pipe body in the axial direction of the pipe body, the pipe body, the water inlet pipe and the water outlet pipe are each of a thin-walled tubular structure, the water outlet pipe is located in the center of the pipe body, the water inlet pipe is separated from the water outlet pipe, the water inlet pipeis uniformly distributed in the circumferential direction of the water outlet pipe, the water inlet pipe is fixedly connected to the pipe body, the water outlet pipe is fixedly connected to the waterinlet pipe, the bottom of the water inlet pipe is in communication with the bottom of the water outlet pipe, the pipe body is filled with heat conduction fluid, and the upper and lower ends of the pipe body are closed so that a heat conducting space for containing the heat conduction fluid can be formed between the inner wall of the pipe body and the outer walls of the water inlet pipe and the water outlet pipe. The buried pipe can ensure the small pipe diameter and length, can more effectively solve the problem about thermal short circuits between water inlet and return pipes and has higher heat exchange efficiency.

Description

Technical field [0001] The present invention belongs to the field of ground source heat pump, and more particularly to a buried tube for soil source heat pump. Background technique [0002] The ground source heat pump is an air conditioning system that is highly heated and refrigerated, which is heated and refrigerated by the ground shallow geothermal resource, but due to the high investment of the ground source heat pump system, restriction and influence of the ground source heat pump technology. And development. Among them, drilling costs account for more than 50% of the initial investment of the entire system. At present, in the ground source heat pump system, according to the form of the buried tube, there is generally in the form of a single U-shaped tube, a dual U-tube, a sleeve tube, a small diameter spiral coil, a large diameter spiral coil, wherein a U-shaped The tube model is widely used, and the hole depth is generally at 30-150m. After the domestic data economic analy...

AI Technical Summary

Problems solved by technology

Due to the temperature difference between the fluid in the inlet and outlet pipes of the ground heat exchanger of the ground source heat pump, limited by the diameter of the borehole, the distance between the inlet and outlet pipes of the U-shaped pipe is small, and heat transfer occurs between the inlet and outlet pipes, which will lead to " "thermal short circuit" phenomenon, so that the heat transfer capacity of the buried pipe heat exchanger is reduced, and the heat transfer efficiency of the system is reduced

Some existing buried pipes prevent heat transfer between the inlet and outlet pipes by setting a heat shield between them. Under the condition that the specifications of the buried pipes remain unchanged, this method can only temporarily block some , in the process of continuous delivery of hot water, the blocking effect of the insulation board is gradually not obvious, and there will still be a "thermal short circuit" phenomenon later

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