基于Fluent模拟的地理管周围不同蓄热体温度场变化分析

为研究地埋管周围不同蓄热材料土壤温度场的分布情况,选定黏土、砂层及砾石3种不同蓄热体,利用Gambit建模软件建立简单的地埋管模型,选择距地埋管中心间距不同的5个测点,利用Fluent数值模拟软件进行蓄热体温度场仿真计算,研究相同蓄热材料距地埋管中心距离不同时以及不同蓄热材料距地埋管中心间距相同时各测点温度的变化情况。结果表明,地埋管周围蓄热材料相同时,土壤各测点温度变化趋势因测点的距离不同而不同,且距离中心越近温度变化越明显;地埋管周围蓄热材料不同时,相同测点温度变化趋势基本一致,且每年取热完成以后的土壤温度升高,但由于导热系数的不同引起每年蓄热及取热过程中温度、蓄热量和取热量的差异。研究结果可为太阳能耦合地源热泵系统地埋管的工程设计提供理论参考。

Analysis of temperature field changes of different regenerators around buried pipes based on Fluent simulation

In order to research the distribution of temperature field when the heat storage material is different, three heat retainers are selected, which are clay, sand and gravel. Gambit modeling software is used to establish a simple model, five measuring points with different distance to the buried pipe center are selected, and the Fluent simulation software is used to carry out simulation calculation of temperature field of different heat retainers. The temperature variation at the five points is figured out when the distance to the buried pipe center is different while the heat storage material is same and when the distance to the buried pipe center is same while the heat storage materials are different. Finally, it is concluded that, with the same heat storage materials around the buried pipe, the temperature variation trend of each measuring point varies according to the distance to the buried pipe center, and the closer it is, the more obvious temperature variation is. With different heat storage materials around the buried pipe, the temperature variation trend at the same measuring point is basically same and the soil temperature rises every year after the heat taken process is completed. However, the difference in thermal conductivity causes the differences in temperature, heat storage and heat taken during the annual heat storage and heat taken process. The results can provide a theoretical reference for the design of the buried pipes of solar-coupled ground-source heat pump system.