双U型地埋管群跨季节蓄热特性研究

doi:10.11949/0438-1157.20221623

摘要/Abstract

摘要：

跨季节埋管蓄热技术（BTES）可以解决能源供需在时间与空间上不匹配的矛盾，是一种提高能源利用效率的重要手段。通过建立埋管蓄热体的三维瞬态数值模型，实现了埋管蓄热体的三类特征温度以及边界热流的全周期动态监测，同时对系统长周期运行下的热特性进行评估。结果表明，经过全周期运行后土壤体积平均温度与初始状态相比提升10%，蓄热体侧面热损失占总热损失的66%~90%，系统BTES效率逐年上升，运行至第7年基本达到稳定，此时效率可达55.2%。可为BTES系统实际工程设计应用提供一定的参考。

关键词: 跨季节埋管蓄热技术, 数值模拟, 计算流体力学, 动态仿真, 特征温度

Abstract:

Borehole thermal energy storage (BTES) can solve the contradiction between energy supply and demand in time and space, which is an important means to improve energy utilization efficiency. In this paper, the three-dimensional transient numerical model of the buried pipe thermal storage is established to realize the full-cycle dynamic monitoring of the three types of characteristic temperatures of the buried pipe thermal storage and the boundary heat flow, as well as to evaluate the thermal characteristics of the system under long-cycle operation. The results show that after the full-cycle operation, the average soil volume temperature increases by 10% compared with the initial state, and the lateral heat loss of the heat storage body accounts for 66%—90% of the total heat loss. The BTES efficiency of the system increases year by year, and basically reaches stability in the 7th year, when the efficiency can reach 55.2%. This research aims to provide a certain reference for the actual engineering design and application of BTES system.

Key words: borehole thermal energy storage, numerical simulation, computational fluid dynamics, dynamic simulation, characteristic temperature

中图分类号:

TK 529

张思雨, 殷勇高, 贾鹏琦, 叶威. 双U型地埋管群跨季节蓄热特性研究[J]. 化工学报, 2023, 74(S1): 295-301.

Siyu ZHANG, Yonggao YIN, Pengqi JIA, Wei YE. Study on seasonal thermal energy storage characteristics of double U-shaped buried pipe group[J]. CIESC Journal, 2023, 74(S1): 295-301.

图/表 13

图1 蓄热体模型水平截面图

Fig.1 Horizontal cross-section of the heat accumulator model

表1 各材料物性参数汇总

Table 1 Summary of physical parameters of each material

材料	密度/ (kg/m³)	比热容/ (J/(kg·K))	热导率/ (W/(m·K))
黏土（0~28 m）	1980	1380	1.31
致密黏土(28~41 m)	2050	1710	1.66
细沙(41~62 m)	1420	840	0.65
回填材料	1700	1200	1.97
双U管	930	2300	0.42
管内流体	998.2	4182	0.6

图2 系统全周期运行时间轴

Fig.2 Timeline of the full cycle of system operation

表2 模型基本参数设置

Table 2 Basic model parameter settings

参数	数值
钻孔间距/m	3
埋管深度/m	60
地埋管内径/mm	26
地埋管外径/mm	32
蓄热工况入口温度/℃	50
取热工况入口温度/℃	8
入口流速/(m/s)	0.6

图3 邯郸市全年逐时气象数据

Fig.3 Hour-by-hour meteorological data of Handan city throughout the year

图4 出口温度实验值与模拟值对比

Fig.4 Comparison of experimental and simulated values of outlet temperature

图5 监测点ch0~ch2温度实验值与模拟值对比

Fig.5 Comparison of experimental and simulated values of temperature at monitoring points ch0—ch2

图6 钻孔体积平均温度全年变化趋势

Fig.6 Annual trend of average temperature of borehole volume

图7 各层土壤及总体积平均温度全年变化趋势

Fig.7 Year-round trends in total volumetric mean temperature and volumetric mean temperature of each soil layer

图8 监测点P1、P2、P3温度全年变化趋势

Fig.8 Annual temperature trends at monitoring points P1, P2 and P3

图9 蓄热体各边界热流逐时变化规律

Fig.9 Time-by-time variation of heat flow at each boundary of the heat accumulator

图10 T1~T4阶段各边界热损失量

Fig.10 Heat loss at each boundary of T1—T4 stage

图11 注热量、取热量、BTES效率逐年变化

Fig.11 Year-to-year changes in heat injection, heat extraction, and BTES efficiency

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