Multi-supply central return pipe vertical buried pipe heat exchanger

Abstract

The invention discloses a vertically buried pipe heat exchanger with multiple supply and one return central return pipes for a ground source heat pump system. The heat exchanger includes multiple vertical water supply branch pipes and a vertical return water pipe; the return water pipe is insulated with a coaxial pipe, and is isolated from the outer casing with matching pipe clips every 3 to 5m; multiple water supply branch pipes Evenly distributed around the pipe-in-pipe, the center of the water supply branch pipe is on the concentric circle of the return pipe; the water supply branch pipe, return water pipe and casing pipe are respectively connected with the water supply straight pipe, return water straight pipe and casing straight pipe on the cylindrical joint at the bottom. Casing connection. The invention improves the heat transfer per unit well depth; the structure is stable, convenient for construction, and can be put into the well hole at one time; the cylindrical joint at the bottom has a strong pressure bearing capacity and is not easy to be damaged; the return pipe uses a pipe-in-pipe for heat preservation, effectively avoiding During construction, the ordinary insulation layer is wetted and becomes invalid. At the same time, it also avoids the thermal short circuit between the water supply and return pipes and the heat exchange between the return water pipe and the saturated heat exchange layer, improves the heat exchange efficiency and reduces the initial investment.

Description

technical field [0001] The invention relates to a ground-buried pipe heat exchanger in a ground-source heat pump system, in particular to a vertical buried-pipe heat exchanger with multiple supply and one return center return pipes. Background technique [0002] The vertical buried pipe ground source heat pump system has received extensive attention due to its advantages of less land occupation and stable working performance. At present, the single-U and double-U buried tube heat exchangers commonly used in engineering have a small heat transfer per well depth, and there is a thermal short circuit between the water supply and return pipes, which causes heat loss and is not conducive to heat exchange. In order to meet the demand for heat exchange, usually more wells are drilled, which not only increases the floor area, but also greatly increases the initial investment of the ground source heat pump system, hindering the popularization and application of the ground source heat...

AI Technical Summary

Problems solved by technology

At present, the single-U and double-U underground buried tube heat exchangers commonly used in engineering have a small heat transfer per well depth, and there is a thermal short circuit between the water supply and return pipes, which causes heat loss and is not conducive to heat exchange.

In order to meet the demand for heat exchange, usually more wells are drilled, which not only increases the floor area, but also greatly increases the initial investment of the ground source heat pump system, hindering the popularization and application of the ground source heat pump system

Images