基于随机近似热探针方法的土壤热物性高精度测量系统

土壤的热物性参数是地源热泵系统设计和埋地电缆优化设计等研究过程中最基本的参数。本文基于随机近似热探针方法,在充分考虑探针自身参数和接触热阻影响的基础上,建立了土壤的多物性快速测量系统,并对不同含水量的土壤热物性进行了现场测量。研究结果显示,该方法不仅从原理上消除了传统热探针测量热物性的系统误差,实现了热导率、比热容等多参数的同时高精度测量;而且可以大大缩短测量时间,减少传统热探针方法由于测量时间过长所导致的水分迁移所带来的测量误差,从而实现对土壤多热物性参数的高精度快速现场测量。

Measurement Apparatus of Soil Thermal Properties by Stochastic Approximation Thermal Probe Method with High Accuracy

The soil thermophysical parameters are the most basic parameters in ground source heat pump systems design and buried cable optimization process. A rapid high-precision multi-function apparatus for measuring the thermal properties of soil based on the stochastic approximation thermal probe method in consideration of the effects of the probe heat capacity and the thermal contact resistance was set up,the thermal properties of soils with different water content were measured in situ. The research results show that systemic errors caused by the conventional thermal probe method would be eliminated,and the thermal conductivities and the specific heat capacities of soil would be measured simultaneously with high accuracy by the apparatus,moreover,the measuring time would be reduced obviously and the effects of the water migration caused by temperature gradient in the moisture soil would be restrained.