The importance of surface air temperature fluctuations on long-term performance of vertical ground heat exchangers

A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation

“…Techniques may include finite element analysis (e.g. [5]) or finite difference analysis (e.g. [6], [7], [8]).…”

Themed Issue on Selected Papers SEG2015 — Part I

“…In this issue, the contribution by Bidarmaghz et al 3 studies the implementation of Ground Heat Exchanger (GHE) concept for the air conditioning of buildings using geothermal energy. A constant temperature in depth is generally assumed in studies involving the thermal performance of GHEs.…”

“…50m or deeper). In this work, Bidarmaghz et al 3 focused their analyses in relatively shallow energy piles, studying the influence of the surface air temperature changes on ground temperature and in the long-term performance of GHEs. The numerical simulations were performed with a 3D model developed in COMSOL that allowed a detailed representation of the main component of the problem.…”

Numerical simulation of ground source heat pump systems considering unsaturated soil properties and groundwater flow

“…Bidarmaghz et al [23] developed a 3D numerical model to investigate the effects of ground surface air temperature variations on BHEs. They reported that considering surface air temperature fluctuations may result in designed BHEs being up to 11% shorter BHEs than when ignored.…”