【作者】 李斌；

【导师】 姚杨；

【作者基本信息】 哈尔滨工业大学 ， 供热、供燃气、通风及空调工程， 2006， 硕士

【摘要】 近些年来,随着我国能源和环境问题日益凸显,突出表现为电力资源供应紧张,这就需要人们迫切寻找解决问题的办法。地源热泵系统是一项以节能和环保为特征的最具有发展前景的空调技术,因此受到越来越多的关注。同时它也是国际空调和制冷行业的前沿课题之一。推广和应用地源热泵的关键技术之一是完善地下换热器埋管的传热模型,使其更好的模拟地下埋管的真实传热过程。本文通过对国内外对土壤源热泵实验研究现状的分析,发现关于地下埋管换热器的传热研究大都基于单一的传热理论,而地下水渗流对地热换热器换热能力产生影响的研究还很少,虽然很多研究者和工程技术人员认识到这一点,也提出过一些定性的分析,但是由于该问题的复杂性,目前还主要集中在数值模拟的方法上,缺少实验方面的证实。因此,本文在达西定律的基础上建立了可以模拟地下水流动的土壤源热泵砂箱实验台,并对多种工况下土壤源热泵地下埋管换热器周围温度场的变化进行了分析。目的是研究在不同热负荷,不同渗流速度下地下埋管换热器周围温度场受到的影响。整个实验测试工作从2005年10月8日开始进行,历时80多天。共30多个工况,主要进行了以下几个方面,包括:土壤物性参数测试、非饱和砂土测试、饱和砂测试、定渗流速度变热负荷温度场测试、定热负荷变渗流速度温度场测试。本文通过对实验中各装置的误差分析,得出整个实验台装置在置信概率为99.73%时的总精度为[-2.39%,2.41%],说明实验结果是可信的。通过对实验数据的分析,发现热负荷的变化主要是影响地下埋管附近的温度场;并且得到地下水流动对土壤温度场的影响不仅与渗流速度大小有关,而且与地下水相对于地下埋管位置的渗流方向关系密切这一重要结论。实验研究所取得的数据及结果,可为土壤源热泵的方案规划、设计提供必要的基础数据和理论依据。该课题为国家自然科学基金项目“土壤蓄冷与土壤耦合热泵集成系统的应用基础研究”(50378024)的一部分。更多还原

【Abstract】 For recent years, both the energy and environmental problems are getting worse, the intense one of which is the short supply of electricity sources, and thus drive people to look for the countermeasures for them. Ground source heat pump (GSHP) system is one of the most promising innovative air-conditioning technology aimed at energy conservation and environmental protection, so it receives more and more attentions. And it is one of the most advanced tasks in international HVAC industry, too. One of the key techniques for GSHP popularization and application is to perfect heat transfer models for the ground heat exchangers to simulate the actual heat exchange process.Based on the analysis of the current state of experimental researches both at home and abroad, found most of researches about GSHP were the onefold theoretical analysis on heat transfer. However the research of the influence of the buried pipes heat exchanger under ground water infiltration was so few. There are many researchers and engineers who have cognizance of this and have make mention of some qualitative analysises. But because this problem is very complex, the present job mainly focus on the numerical simulation methods. It is short of experimental confirmation. A experimental platform of GSHP sand tank was set up, which can simulate groundwater flow and fit for many conditions. besides that, the changes of the soil temperature field around the buried pipes heat exchanger for GSHP are analyzed.The experimental platform based on Darcy-theory. In order to research into the influence of the soil temperature field around the buried pipes heat exchanger under different heating load or different seepage velocity.The experiment spent nearly eighty days from October 8 on 2005. This experiment includes more than thirty conditions. The main conditions are the parameters of ground physics experiment, unsaturated sand experiment, saturated sand experiment, the soil temperature field under the invariable velocity of the infiltration flow of ground water and the soil temperature field under the variable velocity of the infiltration flow of ground water.In the paper, based on the error analysis of experimental device, arriving at更多还原