In this paper

the experimental model of the ground source heat pump central air-conditioning system was established.With this system

the heat transfer performance of the ground source heat pump system was discussed.The temperature data in the deep region was acquired through distributed fiber optic sensing technology.The results demonstrate that the constant temperature zone is 45 mbelow the surface

and the constant temperature is 18℃.The research on the heat transfer performance both in summer and winter demonstrate that the system’s performance is related to the input water temperature and the differential temperature between stratums

and the higher the input water temperature and more differential temperature between stratums

the better heat transfer performance is.The temperature drop range in winter and summer is more than 4.5℃and 2.2℃respectively.According to the monitoring result

the soil is capable of strong temperature self-balanced ability

but after the disturbance

it needs a relatively long compensation process to recover.So usage of ground source heat pump should take a full consideration of the heat balance in warm and cold season.The pipeline on the ground has an obvious effect on the heat transfer performance of ground source heat pump

so we should also take a full consideration on the insulation performance of the over ground part.