基于瞬态平面热源法的土壤热学性质研究

发布时间：2018-06-27 02:35

本文选题：地源热泵 + 瞬态平面热源法　；参考：《湖北工业大学》2017年硕士论文

【摘要】：随着能源利用的日趋紧张以及环境污染越来越严重,人们迫切需要一种清洁能源在不污染环境的前提下既可以供暖又可以制冷,地源热泵技术的出现可以很好的解决这个问题。但是地源热泵的设计需要考虑土壤的热学物理性质,因此准确测量出土壤热学物理参数十分重要。论文依托国家自然科学基金青年科学基金项目“水文地质条件对土壤源热泵系统热交换能效的影响机理研究”开展相关研究。在对浅层地热系统进行介绍的基础上,分析了浅层地埋管地源热泵技术的特点,指出其广阔的发展应用前景;对土壤导热系数的测定方法进行了归纳整理,详细阐述了瞬态平面热源法的测量原理及方法;分析土壤热物性参数的影响因素,为后续的土壤热物性参数测试实验提供重要依据;结合前文的论述制定土壤热学参数的实验方案,进行了土壤不同影响因素下的导热系数测试实验;在对实验结果进行整理和分析的基础上对泰安地区的地源热泵应用进行了一些应用分析。瞬态平面热源法测试导热系数试验结果表明:(1)土壤导热系数与土壤含水量和干密度成正相关,含水量对土壤导热系数影响较大,干密度影响较小。但土壤导热系数并不是随含水量的增长一直递增,当含水量达到一定程度时,导热系数的增长开始变得比较缓慢。干密度对土壤导热系数变化规律不明显,随着干密度的提高,土壤导热系数增加缓慢。(2)土壤导热系数与土壤种类有关,试验结果显示在砂土与黏土混合料的热学性质试验中,砂土与黏土的配比为2:1时导热系数最高。(3)土壤导热系数与地下水位深度成负相关,随着地下水位深度的增加,土壤导热系数会减小。论文对地源热泵技术的进行了较为详细的论述,对影响热泵系统的回填料进行了不同影响因素下的导热系数测试实验和相应的分析。论文的研究对地源热泵技术的应用提供重要参考。
[Abstract]:With the increasing tension of energy use and environmental pollution, people urgently need a clean energy that can be heated and cooled without polluting the environment. The emergence of ground-source heat pump technology can solve this problem very well. However, the design of ground source heat pump needs to consider the thermal physical properties of the soil, so it is very important to accurately measure the soil thermal physical parameters. Based on the project of the National Natural Science Foundation of China, "the influence of hydrogeological conditions on the energy efficiency of heat exchange in ground-source heat pump system", this paper carries out related research. Based on the introduction of shallow geothermal system, this paper analyzes the characteristics of shallow ground source heat pump technology, points out its broad prospect of development and application, summarizes and arranges the measuring methods of soil thermal conductivity. The measurement principle and method of transient plane heat source method are described in detail, and the influencing factors of soil thermal physical parameters are analyzed to provide important basis for the subsequent soil thermal physical parameters test. Based on the previous discussion, the experimental scheme of soil thermal parameters was established, and the thermal conductivity testing experiments were carried out under different influence factors of soil. Based on the analysis of experimental results, the application of ground source heat pump in Taian area is analyzed. The results of transient plane heat source method showed that: (1) soil thermal conductivity was positively correlated with soil moisture content and dry density, water content had a great effect on soil thermal conductivity, and dry density had little effect on soil thermal conductivity. However, the thermal conductivity of soil does not increase with the increase of water content. When the water content reaches a certain degree, the increase of thermal conductivity becomes slower. With the increase of dry density, soil thermal conductivity increases slowly. (2) soil thermal conductivity is related to soil type. The results show that the thermal properties of sand and clay mixture are tested. When the ratio of sand to clay is 2:1, the thermal conductivity of soil is the highest. (3) soil thermal conductivity is negatively correlated with the depth of groundwater level, and the soil thermal conductivity decreases with the increase of the depth of groundwater level. In this paper, the ground-source heat pump technology is discussed in detail, and the test experiment and corresponding analysis of the heat conductivity of the backpackers which affect the heat pump system are carried out under different influence factors. The research in this paper provides an important reference for the application of ground source heat pump technology.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU83

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