Research on thermal storage and release capacity of freezing sandy soil with phase change

Numerical Simulation of Heat Extraction by a Coaxial Ground Heat Exchanger Under Freezing Conditions

“…Freezing-thawing processes around the GHE change the thermal characteristics of the soil thus affecting the thermal exchange between the pipe fluid and the surrounding soil. In particular, a number of experiments show that freezing increases the heat transfer rate and the coefficient of performance [4,5,6,7,8,9,10]. As a result, utilization of latent heat from the groundwater freezing allows, for example, the reduction of vertical GHE length for the GSHP with the same characteristics [5].…”