不同U型地埋管结构跨季节相变蓄热性能

doi:10.19799/j.cnki.2095-4239.2023.0461

摘要/Abstract

摘要：

北方天气属于典型的冬冷夏热气候，夏季光照强度高，适合太阳能蔬菜温室技术的发展。然而冬季天气寒冷，蔬菜温室在应用时受到季节性的限制，为解决夏季热量过多，冬季蔬菜温室采暖温度不足这一问题，本工作利用Fluent软件分别模拟普通U型地埋管与双翅、90°双翅、四翅、45°四翅、六翅U型地埋管蓄热器在夏季的蓄热过程，对比研究不同地埋管结构对蓄热性能的影响。结果发现：U型地埋管结构上下分布，流体为上进下出时，同种翅式U型地埋管结构横向加翅时的液化区域大于纵向加翅时的液化区域，回填中心位置(即x=0 m、y=0 m)的温度呈现纵向加翅大于横向加翅，而横向加翅使径向温升较大；相同时间内，双翅U型地埋管液相率最高，45°四翅U型地埋管液相率最低。而六翅U型地埋管蓄热最快，45°四翅U型地埋管蓄热最慢；位于相变回填材料中的不同U型地埋管结构对温度的影响较大；翅式U型地埋管的蓄热量较普通U型地埋管的蓄热量多15～39 MJ，双翅U型地埋管结构的蓄热量最多，45°四翅U型地埋管的蓄热量最少。

关键词: 地埋管, 跨季节储热, 相变蓄热, 数值模拟

Abstract:

Northern weather is characterized by typical cold winters and hot summers, with high light intensity in the summer, which is suitable for the development of solar vegetable greenhouse technology. However, winters are cold, and the use of vegetable greenhouses is subject to seasonal restrictions. To solve the problem of excess heat in summer and the insufficient heating temperature of vegetable greenhouses in winter, Fluent software is employed to simulate the heat storage of ordinary U-shaped buried pipes with a double wing, 90° double wing, four wing, 45° four wing, and six-wing U-shaped buried pipe heat accumulator in the summer, and the effects of different buried pipe structures on the heat storage performance are compared and investigated. The results reveal that the U-shaped buried pipe structure is distributed up and down, and when the fluid is up and down, the liquefaction area of the same wing-type U-shaped buried pipe structure is greater than that when it is finned longitudinally. The temperature of the backfill center position (i.e., x=0 m, y=0 m) reveals that longitudinal winging is greater than transverse winging, whereas lateral winging leads to an increase in the radial temperature. At the same time, the double-winged U-shaped buried pipe exhibits the highest liquid phase rate, while the 45° four-winged U-shaped buried pipe exhibits the lowest liquid phase rate. The six-winged U-shaped buried pipe exhibits the fastest heat storage, whereas the 45° four-winged U-shaped buried pipe exhibits the slowest heat storage. Different U-shaped buried pipe structures located in phase-change backfill materials considerably affect temperature. The heat storage of the winged U-shaped buried pipe is 15—39 MJ greater than that of the ordinary U-shaped buried pipe, the double-winged U-shaped buried pipe structure exhibits the highest heat storage, and the 45° four-wing U-shaped buried pipe exhibits the least heat storage.

Key words: buried pipes, cross-seasonal heat storage, phase change heat storage, numerical simulation

中图分类号:

TK 52

王晨, 崔海亭, 王超, 张亚磊, 陈浩松. 不同U型地埋管结构跨季节相变蓄热性能[J]. 储能科学与技术, 2023, 12(12): 3808-3817.

Chen WANG, Haiting CUI, Chao WANG, Yalei ZHANG, Haosong CHEN. Examination of the cross-seasonal phase-change heat storage performance of different U-shaped buried pipe structures[J]. Energy Storage Science and Technology, 2023, 12(12): 3808-3817.

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项目	密度/(kg/m³)	比热容 /[J/(kg·K)]	热导率 /[W/(m·K)]
循环水	1000	4200	0.6
U型地埋管	900	2300	0.35
相变材料(石墨-石蜡)	950	2000	0.2
土壤	2000	1000	2.2

网格数量	6 h时P点温度/℃	12 h时P点温度/℃
94969	30.6	31.3
137309	30.1	30.7
236859	29.7	30.4

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