Energy pile is an energy-saving and emission-reduction technology

combining the functions of structure load supporter and shallow geothermal heat exchanger. There has been application in the world in recent years. Normally

the comprehensive thermal conductivity coefficient of soil is measured through ground source heat pump technique. However

this value is unsuitable to calculate the heat exchange efficiency of energy pile accurately. Field tests and numerical simulations on the soil thermal conductivity coefficient were obtained in energy pile group with low cap located on Henan Polytechnic University. The influence of heating time

heating power

flow rate

pile length and the arrangement of energy pile in groups on the soil comprehensive thermal conductivity coefficient are analyzed. It shows that the line heat source analysis method

based on the ground source heat pump testing

is unsuitable for the calculation of soil comprehensive thermal conductivity coefficient . Hence

it is necessary to develop one testing and analyzing method which can considering pile diameter

etc.