Simplified calculation method for sleeve type ground heat exchanger

Abstract

The invention relates to a simplified calculation method for a casing pipe type ground heat exchanger, which comprises the following steps: step 1, simplifying the casing pipe type ground heat exchanger into five layers according to geological rock-soil characteristics, and calculating each layer as a two-dimensional unsteady heat transfer process, and step 2, assuming calculation conditions, and calculating the two-dimensional unsteady heat transfer process according to the assumed calculation conditions. The influence condition is simulated according to the actual situation; and 3, single-segment solution is carried out on the single layer under the assumed condition. 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, a complex three-dimensional unsteady-state heat transfer problem is simplified into a two-dimensional unsteady-state heat transfer problem; therefore, simplified calculation can be carried out on the sleeve type buried pipe heat exchanger under different conditions, the calculation efficiency is improved, certain actual use value and popularization value are achieved, and the problems that in the prior art, the heat transfer calculation process of the sleeve type buried pipe heat exchanger is complex, and the calculation efficiency is low are solved.

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. Its competitiveness in the field of clean energy utilization is becoming stronger and stronger. It can effectively help to achieve the strategic goal of carbon neutrality at an early date. Currently, according to the mining depth of geothermal resources, ground source heat pumps The system can be divided into shallow (0-200m), medium-deep (200-3000m) and ultra-deep (greater than 3000m). Shallow geothermal energy needs to extract groundwater, which is greatly affected by the stability of water temperature, water volume and policy protection. , or need to occupy a large amount of buried pipe area, which is difficult to carry out in cities; while the utilizat...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a simplified calculation method for the casing-type buried tube heat exchanger. By simplifying the calculation process and effectively improving the calculation efficiency, it solves the problems of the casing-type ground heat exchanger in the prior art. The heat transfer calculation process of borehole heat exchanger is complex and the calculation efficiency is low

Images