| 摘要: |
| 为探讨防护工程垂直U形地埋管的换热性能，利用某地下工程地源热泵实验台，对比分析了两种工况进出口水和土壤温度的变化规律。结果表明：24 h连续运行时，埋管换热量逐渐降低；间歇12 h运行时，钻孔初始时局部换热量与连续运行时相差较大，而总时间内钻孔平均换热量要大于连续运行。建议防护工程在应对突袭时采用连续运行模式，并将热稳定时间和该时间内的换热量作为工程地埋管系统应突处理能力的评价指标之一，但工程长期使用时应采用间歇运行模式。该工程本次实验所测得的热稳定时间为14 h，换热量为1 310.4 kJ/m。 |
| 关键词: 热泵 U形地埋管 防护工程 土壤温度 换热量 |
| DOI： |
| Received:March 21, 2017 |
| 基金项目: |
|
| Experimental Study on Heat Transfer Performance of Vertical U-type Buried Pipe in Protective Engineering |
|
Liao Lu, Mao Jinfeng, Chen Shangyuan, Hou Pumin, Liu Liyao
|
| (College of Defense Engineering, Army Engineering University of PLA) |
| Abstract: |
| In order to discuss the heat transfer performance of a vertical U-tube in protective engineering, the changes in the inlet and outlet water and soil temperatures were analyzed under two different conditions based on a ground source heat pump experimental platform for underground engineering. The underground temperature was measured during the test, and the thermal diffusion ability of the soil was studied. The results showed that the heat exchange gradually decreased under the condition of 24 h continuous operation. Under the condition of 12 h intermittent operation, the local heat exchange at the beginning was significantly smaller than that of the continuous operation, but the average heat transfer capacity was larger than that of the continuous operation. A continuous operation model should be used when protective engineering deals with raids, while the thermal stability time and heat exchange at that time should be recommended as indexes to evaluate the ability of a buried pipe system when dealing with raids. The time and heat exchange measured in this experiment were 14 h and 1 310.4 kJ/m. However, an intermittent operation model should be adopted when the engineering is used over a long period because it effectively slows down the heat accumulation. |
| Key words: heat pump U-type buried pipe protective engineering soil temperature heat exchange |
