地源热泵地下换热器计算模拟及地上机组节能研究

【作者】 史新慧；

【导师】 李素芬；

【作者基本信息】 大连理工大学 ， 热能工程， 2004， 硕士

【摘要】 土壤源热泵是一种环保节能的绿色空调技术。在北美、欧洲和日本得到了广泛的关注，研究日趋深入，应用日趋广泛。通过广泛的调研，根据我国实际的土壤、气候条件，并联系国外发展经验，对土壤源热泵技术在我国的应用前景进行了多角度的论证，对该技术在我国的应用提供了可行性分析。本篇论文综述了国外应用土壤源热泵技术的最新进展，地下岩土热物理研究的基本理论，侧重于土壤源热泵地下换热器的研究。 本文研究了地下岩土的热力性能，建立了地下岩土温度分布动态模型。比较大连地区，重庆地区和广州地区一年四季地下50米以内温度分布。对于竖直套管式地下换热器换热及其温度场的扩散建立了相应的数学模型并编制了计算程序进行了数值模拟。确定不同水流量、不同深度，不同岩土导热系数对地下换热器出水温度的影响程度。分析不同的回填材料对地下换热器传热的影响。对于U型管建立了数学模型，使用有限差分法给出了数值解法。分析了埋管材料和几何形状，回填土和管外土壤温度场各个不同工况下的动态特性。对土壤源热泵系统进行了(火用)分析，讨论地下换热器对地上机组的影响，分析不同水流量、不同埋管深度、不同岩土导热系数对性能系数和(火用)效率的影响，指出了节能的方向。对土壤源热泵系统进行经济性分析，对比传统锅炉供暖和单冷空调制冷，土壤源热泵系统有自己的优势。更多还原

【Abstract】 Ground-source heat pump is a kind of green-conditioning technology, with does no harm to the environment. The technology has been brought to the attention the North America, European countries and Japan for a number of desirable characteristics. They have broadened application in these areas. This paper introduced the latest progress of ground source heat pump technology abroad and basic theory of underground rock’s thermal characteristics with emphasis on heat exchange research of underground heat exch’anger. Regarding the conditions of the soil and the climate, the national standards and national development plans, the experience of GSHP technology development in other countries, the feasibility of GSHP in our country is revalued by massive investigation.This paper described a model and solution algorithm developed to predict the outlet temperature of thermal well underground heat exchanger on a certain condition. A transient, two-dimensional numerical model of the vertical ground heat exchanger is established. Based on the model the influences of tube material and tube geometry character, the thermal conductivity of the back-fill material and the soil, and the operation mode are analyzed. The soil temperature distribution around the borehole is analyzed too. And some theoretical conclusions of reasonable design for underground exchanger are made. This paper introduced exergy analysis, all the results are applicable to both the theoretical and the practical work.更多还原