https://ideas.repec.org/a/gam/jeners/v10y2017i11p1897-d119421.html
Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers
Downloadable! The performance of very shallow geothermal systems (VSGs), interesting the first 2 m of depth from ground level, is strongly correlated to the...
the thermalhorizontal groundfactorsinfluencingefficiency