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Method of determining thermophysical parameters of rock soil and heat resistance of vertical ground heat exchanger

A technology for buried tube heat exchangers and thermophysical parameters, which is applied in the fields of instruments, material thermal development, electrical digital data processing, etc., and can solve problems such as design errors of buried tube heat exchangers

Active Publication Date: 2018-04-13
SHANDONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The thermophysical parameters determined by the arithmetic mean temperature and the thermal resistance of the heat exchanger are likely to cause a certain design error of the buried tube heat exchanger

Method used

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  • Method of determining thermophysical parameters of rock soil and heat resistance of vertical ground heat exchanger
  • Method of determining thermophysical parameters of rock soil and heat resistance of vertical ground heat exchanger
  • Method of determining thermophysical parameters of rock soil and heat resistance of vertical ground heat exchanger

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Embodiment Construction

[0084] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments.

[0085] Such as figure 1 As shown, it shows the schematic diagram of the vertical buried pipe ground source heat pump system. The vertical buried pipe ground source heat pump system includes a buried pipe heat exchanger 1, a heat pump unit 2 and an indoor fan coil 3 connected in sequence. A first circulating water pump 4 is provided on the water supply pipeline between the buried tube heat exchanger 1 and the heat pump unit 2 , and a second circulating water pump 5 is provided on the return water pipeline between the indoor fan coil unit 3 and the heat pump unit 2 .

[0086] Such as figure 2 and image 3 As shown, each independent buried pipe heat exchanger includes a U-shaped pipe 6 buried in the soil 9, which is formed by connecting the first vertical pipe 12 and the s...

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Abstract

The invention discloses a method of determining thermophysical parameters of rock soil and heat resistance of a vertical ground heat exchanger. The method includes steps: initializing test data and parameters of a drill hole and a buried pipe acquired in a thermal response experiment; initially setting rock soil heat conducting coefficient lambda s, rock soil volume heat capacity Cs and weight coefficient f corresponding to weight average temperature, and setting respective parameter ranges; using a column heat source model and a quasi-three-dimensional heat resistance model to calculate drillhole wall temperature Tb, I, ground heat exchanger inlet-outlet fluid temperature Tin, sim, i, Tout, sim, I and ground heat exchanger heat resistance Rb, I corresponding to each moment in the experiment; using square sum mean value of measured value and simulation value difference of the weight average temperature as a target function fopt, and using a simulated annealing algorithm to perform optimization iteration on lambda s, Cs and f; when fopt is lower than an optimization target value delta Tset, acquiring optimization results of three parameters lambda s, Cs and f, calculating a mean value of the sum of Rb, I at each moment corresponding to the optimization results, and acquiring heat resistance Rb of the ground heat exchanger. By the method, accuracy of recognition results on the thermophysical parameters of the rock soil and the heat resistance of the ground heat exchanger is improved.

Description

technical field [0001] The invention belongs to the technical field of vertical buried pipe ground source heat pumps, and in particular relates to a method for determining the thermal physical property parameters of rock and soil and the thermal resistance of a vertical buried pipe heat exchanger. Background technique [0002] The vertical buried pipe heat exchanger is an important energy collection device for the vertical buried pipe ground source heat pump system. The soil thermal response experiment is the most effective way to obtain the thermal physical parameters of rock and soil. It needs to be combined with the mathematical model of the buried pipe heat exchanger, and the thermal physical parameters and the thermal resistance of the heat exchanger should be identified by using the average temperature of the inlet and outlet fluids. The thermophysical parameters determined by the arithmetic mean temperature and the thermal resistance of the heat exchanger are likely t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G06F17/50
CPCG01N25/20G06F30/20
Inventor 张长兴刘玉峰
Owner SHANDONG UNIV OF SCI & TECH
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