Simplified calculation method for sleeve type ground heat exchanger

Abstract

The invention relates to the technical field of geothermal resource development and utilization, and discloses a simplified calculation method of a sleeve type ground heat exchanger, which comprises the following steps: 1) the thermophysical properties of a backfill material and surrounding rock soil are uniform and consistent, the thermophysical parameters of the backfill material and surrounding rock soil do not change along with the change of radial and vertical sizes, and the influence of groundwater seepage and soil moisture transfer is neglected; and 2) no heat conduction phenomenon exists in the vertical direction, that is, the heat transfer process is a two-dimensional heat transfer problem along the radial direction of the buried pipe. According to the simplified calculation method of the sleeve type buried pipe heat exchanger, by adopting the calculation method, grid division in the heat transfer calculation process of the sleeve type buried pipe heat exchanger can be reduced, and meanwhile, the complex three-dimensional unsteady-state heat transfer problem is simplified into the two-dimensional unsteady-state heat transfer problem; therefore, simplified calculation can be carried out on the sleeve type ground heat exchanger under different conditions, calculation efficiency is improved, and the method has certain actual use value and popularization value.

Description

technical field [0001] The invention relates to the technical field of development and utilization of geothermal resources, in particular to a simplified calculation method for a casing-type buried tube heat exchanger. Background technique [0002] Geothermal energy is a clean and environmentally friendly renewable energy, and its competitiveness in the field of clean energy utilization is becoming stronger and stronger. At present, according to the mining form of geothermal resources, it can be divided into two types: open type and closed type. Open type ground source heat pump system Groundwater needs to be extracted, which is greatly affected by the stability of water temperature, water volume and policy protection, and it is difficult to carry out in cities; while the closed ground source heat pump system adopts the form of buried pipe heat exchanger, which is divided into shallow buried pipe and Medium-deep buried pipes, the buried pipe depth of the medium-deep buried p...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a simplified calculation method for casing-type buried tube heat exchangers, which has the advantages of improving calculation efficiency and solves the problem of low calculation efficiency

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