Experimental analysis of ground temperature distribution of double-U type energy piles
Zhao Haifeng , Tang Rongbin , Gui Shuqiang , Luo Jin , Jia Jia
DOI:10.11835/j.issn.1674-4764.2016.05.020
Received March 09, 2016,Revised , Accepted , Available online July 04, 2017
Volume ,2016,Pages 157-163
- Abstract
Two double U-type buried tube energy piles in Xinyang region were investiguted. Long time TRT tests and temperature recovery-TPT test are conducted to simulate the operating state of energy piles under intermittent conditions. Sensors are prepared in the energy pile wall and soil, the distribution of temperature field during the operation of energy piles is measured.? The research results show energy piles in the operating process of heat transfer performs three-dimensional characteristics, the soil temperature in pile end position changes lag to the middle region of the pile body. It is hence suggested that the increace of the buried pipe in pile end position could increase energy pile heat exchange efficiency. The test results show the temperature of the soil around the pile is increased about 1℃ after temperature recovery about 25 days after the 172 h TRT, verifying the slow conduction and good heat storage of the rock and soil body. At the same time, the importance of the cold and heat imbalance of the ground source heat pump system is also predicted.