A Measuring Device for Soil Thermophysical Parameters and Seepage Parameters

Abstract

The invention relates to the technical field of ground source heat pump design, and in particular to a measuring device for soil thermophysical parameters and seepage parameters. The measuring device adopts a neural network parameter identification method to identify soil thermophysical parameters and seepage parameters. During the identification process The soil to be identified is subjected to a thermal response experimental test to obtain the measured parameters after the thermal response experimental test of the soil to be identified, and then input into the pre-trained neural network to obtain the thermophysical parameters and seepage parameters of the soil to be identified. . This measuring device can directly identify and display the soil thermal physical parameters and seepage parameters during on-site thermal response experiments. The process is fast, accurate, and more practical. The identification method used establishes thermal responses through on-site thermal response experiments and neural networks. The mapping relationship between measurement parameters and soil thermal physical properties, seepage direction and velocity avoids identification errors caused by using traditional identification models and improves the accuracy of soil thermal physical property identification.

Description

technical field [0001] The invention relates to the technical field of ground source heat pump design, in particular to a measuring device for soil thermophysical property parameters and seepage parameters. Background technique [0002] The ground source heat pump system has high operating efficiency, good energy saving and environmental friendliness. As an important part of the ground source heat pump, the buried pipe heat exchanger has a direct impact on the energy efficiency and operating performance of the ground source heat pump system. and economic benefits. Soil thermophysical parameters are important parameters in the design of buried pipe heat exchangers. Their values ​​affect the number and depth of drilling design, and then affect the initial investment and operating performance of the heat pump system. Therefore, how to accurately obtain soil thermophysical parameters becomes very important. important. The current identification of soil thermophysical propertie...

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Problems solved by technology

The current identification of soil thermophysical properties is based on the thermal response test, and the heat transfer model is used to solve the inverse problem of soil thermophysical parameters. This process has the following defects: First, the existing identification models (linear heat source model and cylindrical heat source model) for thermal and physical property identification, due to the ideal construction in many aspects of the model, it brings more or less errors to the identification results, thus affecting the identification accuracy. Although the current improved identification model has improved accuracy, the complexity It is also greatly increased, and it is difficult to apply to actual engineering; secondly, the required measurement parameters of the existing thermal response experiments are limited to the water temperature at the inlet and outlet of the buried pipe, and the measurement form is relatively simple; at the same time, due to the aquifer in the formation, the groundwater Seepage will take away the energy accumulated in the soil and improve the heat transfer performance between the buried pipe and the soil. When considering the influence of seepage factors in engineering, it is often equivalent to the increase in soil thermal conductivity, but this assumption is Inaccurate, the design error is particularly obvious in the long-term operation of buried pipe groups, so an accurate and practical identification method of soil thermophysical parameters, seepage direction and velocity and a measurement method based on this method are proposed device is very important

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