Ground source heat pump underground heat exchanger depth of several experience

Horizontal buried pipe laying situation is relatively simple, not repeat them here. The buried depth of the vertical buried pipe should be considered in consideration of the local geological conditions, the size of the project and the site, the investment and the performance of the drilling rig used. According to the actual conditions of our country, according to engineering experience, several points should be noticed: (1) Drilling depth less than 60m is less and the cost is lower. If it is larger than 60m, the drilling cost will increase; (2) Pressure (pressure 1.0MPa) plastic pipe, such as the depth of more than 80m, the need to use high pressure plastic pipe, the cost greatly increased; ③ According to the comparison, the cost of well 50m lower than the 100m to 30% to 50%. The above is for the central ground room, if the use of sub-room-type water source heat pump system also takes into account the impact of building height. In general, the advantages of shallow buried pipe are: less investment, low cost, less rig requirements, the use of ordinary pressure (0.6 ~ 1.0MPa) of plastic pipe, due to the influence of ground temperature, general geothermal winter and summer heat balance than it is good. The disadvantage is that it occupies a large area of ​​the venue, pipe joints, buried heat exchange efficiency is lower than those buried in the deep. The advantages of deep buried pipe are: small occupied area, stable underground rock temperature, high heat exchange efficiency, large unit pipe heat exchange capacity, and fewer pipe joints. The disadvantage is the large investment, high cost, the need to use high pressure (1.6 ~ 2.0MPa) plastic pipe, drilling rig performance requirements; due to the temperature of deep rock and soil surface temperature is very small, so must pay attention to winter heat absorption and summer Exhaust heat balance, otherwise it will affect the long-term use of ground source heat pump effect. Abroad, some have adopted the installation of cooling towers in the system and auxiliary heating measures to help achieve the balance of underground rock. In the buried pipe between shallow, buried between the two, plastic pipe can be used ordinary pressure-type. From the statistics of domestic and foreign engineering examples, buried in the majority of ground source heat pump. In the actual project using horizontal or vertical buried pipe, vertical pipe depth how much depends on the size of the site, the type of local rock and excavation costs. If the site is large enough and no hard rock, the level of more economical, if the use of pipe machines for multi-tube arrangement can also reduce the area occupied by the site. Vertical pipe should be used when space is limited, and in many cases this is the only option. If there are hard rocks in the site, drill holes can be successfully drilled with rock drills.

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