考虑流固耦合传热的土壤源热泵地下换热器研究
发布时间：2018-11-23 19:50
【摘要】：土壤源热泵系统因为其高效、环保、节能等特性日益得到人们广泛的重视，而应用和推广地源热泵的关键技术之一是解决地埋管与土壤之间的传热问题，因此完善地下换热器的传热模型，使其能更真实的模拟地埋管换热器传热过程具有重要的意义。 本文对双U型管地下换热器进行三维传热和流动模拟计算，与现有的简化模型相比，在模拟中没有任何几何尺寸上的简化，真实模拟包括管内液体与管内壁间的对流传热，管壁与回填材料之间的导热，回填材料与土壤导热以及土壤的导热在内的复杂传热过程。本文的研究内容主要有： 1.建立三维流固耦合传热模型，模拟了放热工况下双U型管与土壤的传热，得到双U型管水平和竖直方向上的温度分布特点，并提取出了双U型管的单位井深换热量随时间的变化规律。 2.结合热响应实验将埋管出口水温及孔壁温度的实测值与模拟结果对比，平均误差分别为4.9%和3.7%，，验证了本文建立的地下换热器传热模型的正确性。 3.用验证后的模型与现有有限长线热源模型进行对比分析，根据模拟结果对线热源模型进行数值修正。 4.在修正后的线热源模型基础上建立土壤源热泵换热孔群的三维模型，模拟土壤源热泵换热孔群传热特性的研究。 本文对土壤源热泵地下换热器的研究可以应用于实际工程并作出指导。
[Abstract]:Ground-source heat pump system has been paid more and more attention because of its high efficiency, environmental protection, energy saving and so on. One of the key technologies in the application and popularization of ground-source heat pump is to solve the heat transfer problem between ground buried pipe and ground source heat pump. Therefore, it is of great significance to perfect the heat transfer model of underground heat exchanger and make it more realistic to simulate the heat transfer process of underground tube heat exchanger. In this paper, the three-dimensional heat transfer and flow simulation of the double-U-tube underground heat exchanger is carried out. Compared with the existing simplified model, there is no simplification in the geometry of the simulation. The real simulation includes the convection heat transfer between the liquid in the tube and the inner wall of the tube. Heat conduction between pipe wall and backfill material, heat conduction between backfill material and soil, and heat conduction in soil. The main contents of this paper are as follows: 1. A three-dimensional fluid-solid coupled heat transfer model was established to simulate the heat transfer between double U tube and soil under the condition of heat release, and the temperature distribution characteristics in horizontal and vertical direction of double U tube were obtained. The variation law of heat transfer per unit well depth with time of double U tube is also extracted. 2. The experimental results show that the average errors are 4.9% and 3.7%, respectively, which verify the correctness of the heat transfer model established in this paper. 3. The verified model is compared with the existing finite line heat source model, and the linear heat source model is modified numerically according to the simulation results. 4. Based on the modified linear heat source model, a three-dimensional model of the ground source heat pump (GSHP) was established to simulate the heat transfer characteristics of the ground-source heat pump (GSHP). In this paper, the ground heat exchanger of ground source heat pump can be applied to practical engineering.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83
本文编号：2352532
[Abstract]:Ground-source heat pump system has been paid more and more attention because of its high efficiency, environmental protection, energy saving and so on. One of the key technologies in the application and popularization of ground-source heat pump is to solve the heat transfer problem between ground buried pipe and ground source heat pump. Therefore, it is of great significance to perfect the heat transfer model of underground heat exchanger and make it more realistic to simulate the heat transfer process of underground tube heat exchanger. In this paper, the three-dimensional heat transfer and flow simulation of the double-U-tube underground heat exchanger is carried out. Compared with the existing simplified model, there is no simplification in the geometry of the simulation. The real simulation includes the convection heat transfer between the liquid in the tube and the inner wall of the tube. Heat conduction between pipe wall and backfill material, heat conduction between backfill material and soil, and heat conduction in soil. The main contents of this paper are as follows: 1. A three-dimensional fluid-solid coupled heat transfer model was established to simulate the heat transfer between double U tube and soil under the condition of heat release, and the temperature distribution characteristics in horizontal and vertical direction of double U tube were obtained. The variation law of heat transfer per unit well depth with time of double U tube is also extracted. 2. The experimental results show that the average errors are 4.9% and 3.7%, respectively, which verify the correctness of the heat transfer model established in this paper. 3. The verified model is compared with the existing finite line heat source model, and the linear heat source model is modified numerically according to the simulation results. 4. Based on the modified linear heat source model, a three-dimensional model of the ground source heat pump (GSHP) was established to simulate the heat transfer characteristics of the ground-source heat pump (GSHP). In this paper, the ground heat exchanger of ground source heat pump can be applied to practical engineering.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83
【参考文献】
相关期刊论文 前7条
1 魏先勋,李元旦,林玉鹏,曾光明;土壤源热泵的研究[J];湖南大学学报(自然科学版);2000年02期
2 刘宪英,胡鸣明,魏唐棣;地热源热泵地下埋管换热器传热模型的综述[J];重庆建筑大学学报;1999年04期
3 吴永华,何雪冰,刘宪英,肖益明;U型垂直换热器地源热泵夏季供冷测试及传热模型[J];建筑热能通风空调;2003年01期
4 李元旦,张旭,周亚素,陈沛霖;土壤源热泵冬季工况启动特性的实验研究[J];暖通空调;2001年01期
5 程群英,罗明智,孙纯武,刘宪英;地源热泵夏季性能测试及传热模型[J];暖通空调;2005年03期
6 施志钢,于立强;土壤源热泵垂直埋管周围温度场数值模拟[J];青岛建筑工程学院学报;2002年01期
7 吕灿仁;热泵与节能[J];自然杂志;1981年06期
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