Ground source heat pump system of buried tube heat exchanger for heat transfer medium and soil heat exchange, by the buried closed circulation pipe group, also known as the soil heat exchanger. According to the pipeline buried in different ways, is divided into horizontal buried tube heat exchanger and vertical buried tube heat exchanger.

Horizontal ground heat exchanger in the installation can not set gradient. The upper tube top shall be under the frozen soil layer 0.4m, and apart from the ground should not be less than 0.8m.

Vertical buried tube heat exchanger pipe burying depth is more than 20m, the hole should not be less than 0.11M, borehole spacing should satisfy the heat required, spacing should be 3-6m. Horizontal connecting pipe depth under the frozen soil layer 0.6m, and apart from the ground should not be less than 1.5m.

Buried pipe shall be of good chemical stability, corrosion resistance, thermal conductivity coefficient, small flow resistance of plastic pipes and pipe fittings, should adopt the polyethylene pipe ( PE80 or PE100 ) or polybutylene ( PB ), inappropriate use of polyvinyl chloride (WC) tube. Pipe fittings and pipe should be the same material. Buried pipe quality should be consistent with the provisions of the current national standard. Nominal pipe pressure and temperature should meet the design requirements, and the pipe material nominal pressure shall not be less than 1.0MPa.