Modelling and optimization of helical steel piles as in-ground heat exchangers for Ground-Source Heat Pumps

Sarah R. Nicholson, Aggrey Mwesigye, Seth B. Dworkin

Research output: Contribution to journalConference article

Abstract

Ground source heat pumps are a sustainable way to provide building heating and cooling due to their efficient use of near-constant ground temperatures as mediums for heat exchange. Conventional in-ground heat exchangers are limited by the large size of required borehole field installations and the high economic costs, therefore the pairing of in-ground structural helical piles with these heat exchangers offers a system of geothermal heating and cooling which can be more accessible and lower cost than traditional equipment. In this research, a novel helical steel pile was modelled using a 3-D numerical model and finite element analysis. This model was first validated with experimental data from a double-tube pile, with 24-hr transient operation outlet temperatures accurate within 3%. Finally, the steady state heat exchange rate per unit area was calculated, with the new helical steel pile geometry yielding an increase of 8.6 W/m, 13.2 W/m, and 16.2 W/m (for 2 L/min, 4 L/min, and 8 L/min flowrates respectively) over the validation model.

Original languageEnglish (US)
Article number052026
JournalIOP Conference Series: Materials Science and Engineering
Volume609
Issue number5
DOIs
StatePublished - Oct 23 2019
Event10th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, IAQVEC 2019 - Bari, Italy
Duration: Sep 5 2019Sep 7 2019

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