Proceedings - 13th International Workshop on Micropiles - 2017, Vancouver, BC, Canada, (ISM, DFI, ADSC)
INVESTIGATION OF THE CONCENTRIC VERTICAL GROUND LOOP OF A HEAT PUMP IN AN ENERGY MICRO-PILE
Abdel Ramadan, Kamran Siddiqui, Hesham El Naggar
The heat exchange process in a vertical ground-loop heat exchanger was numerically investigated. Among the three initial configurations (U-tube, concentric and spiral), the U-tube configuration yields the highest fluid temperature rise i.e. highest heat transfer rate while the concentric pipe configuration has the lowest fluid temperature rise. Despite lower performance, concentric pipe may be practically more feasible for integration into micropile foundation construction, especially when hollow bars are used as the reinforcing element. The performance of a concentric pipe in an energy pile was also simulated. Two distinct regions of temperature increase are observed. Higher temperature rise in the annular section than the inner pipe. Both regions showed semi-linear behavior of the temperature rise, which may be attributed to the varying ground temperature. The effect of variation of soil temperature in the vicinity of the pile should be further investigated.
|article #2632; publication #1033 (ISM- 2017)|