| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 645635 | Applied Thermal Engineering | 2015 | 8 Pages |
•Two exchangers model are compared: horizontal rings model and annular cylindrical conduit.•The freezing of the subsoil is analyzed.•The natural thermal load of the ground is studied.•The thermal behavior in both long and short terms is investigated.•Optimization rule is proposed to design the geothermal helical heat exchangers.
This paper presents a computational analysis of geothermal heat pump used to assess the thermal needs of a 120 m2 low-energy house. Helical heat exchangers are used to extract or inject heat into shallow subsoil. Two 2D-axisymmetric models of helical heat exchangers are compared. The frozen of the subsoil such as its thermal relaxation during the summer are analysed. The performance of the exchangers is being studied over a 10-year period. The impact of the heat-pump operating modes (short cycles vs. long cycle) on the system efficiency is assessed, and the influences of the subsoil properties and of the geometry of the geothermal exchangers are further studied. A sizing law relating the number of exchangers to be used and their height/diameter is proposed.
