Ground-source heat pumps are energy conversion systems that provide heating, air conditioning, and hot water to building spaces using a large number of low-temperature heat sources stored in shallow underground soil, rock, groundwater, or other media. Ground source heat pumps are by far one of the most comfortable, efficient and environmentally friendly technologies. Ground source heat pump can be applied to central air conditioning systems, floor heating, hot water supply, etc. in office buildings, villas, schools, hotels, hospitals, etc., especially in central air conditioning systems.

Ground source heat pump introduction to the principle of energy saving of ground source heat pump

In the summer, the general central air conditioner mainly achieves the cooling effect through the cooling tower and the cooling pool, and the heating effect is mainly achieved by the boiler in the winter. Among them, whether it is summer cooling and winter heating, energy consumption is very large and the efficiency is not high. The ground source heat pump central air conditioning system uses the temperature of the soil or rock within tens of meters to one hundred meters below the ground to achieve cooling or heating of the building. The temperature used in the system is generally between 15 degrees Celsius and minus 17 degrees Celsius throughout the year, the winter is significantly higher than the surface temperature, the summer is significantly lower than the surface temperature, and part of the heat collected in summer can be stored in the underground soil for winter. Heating. Ground-source heat pump air conditioning system 60%~70% of energy comes from the soil, 30%~40% comes from electric energy, so it has outstanding energy-saving performance.

Classification of ground source heat pumps

According to the source of the heat source, the ground source heat pump can be divided into groundwater source heat pump, surface water source heat pump and ground pipe ground source heat pump. The low-level heat energy of the ground-source heat pump of the buried pipe mainly comes from the shallow underground soil, rock and other media, and the heat is exchanged through the circulating water of the closed-circuit system of the pipeline. The resources are extremely rich, almost independent of geographical location, and it is very environmentally friendly and energy-saving. Therefore, this method has the most promising application (the following content mainly introduces the buried ground source heat pump). Ground source heat pump system

Pipeline products

The pipeline part of the ground source heat pump system mainly adopts PE (PE100, PE80 grade) pipeline and PB pipeline. Among them, PE pipeline is widely used in many projects due to its remarkable economical efficiency. The pipeline part of the ground source heat pump mainly includes a main pipe (collecting pipe) that connects the heat pump unit, a buried pipe that performs heat exchange, and various accessories that connect the entire piping system. Supervisor

Supervisors generally use the D40-63 specification, and some large projects use the D110 supervisor. The pressure level of the main pipe is generally 1.0MPa or more, and the relevant dimensions of the pipe are referred to GB13663, the national standard for PE water supply pipes. The length of the supervisor is generally determined by the design of the project. Sometimes due to geographical or geological conditions, the laying of the buried pipe may need to be 1 to 2 km away from the building. In this case, a long supervisor is required.

The supervisor generally supplies the straight pipe, and the special circumstances are determined by the design unit and the manufacturer.

In order to avoid the pipeline freezing in winter, the supervisor should be buried below the frozen soil layer and only when the indoor unit is connected. The main part of the main layer above the frozen soil layer usually needs polystyrene or rubber and plastic materials for heat preservation treatment.

Buried tube

The buried pipe has D16, D20, D25, D32, D40 and other specifications, but most of them are D25 and D32 specifications, especially D32 specifications, because the buried depth is generally about 100 meters, the pressure level is mostly 1.0MPa or more. The most common is 1.6MPa. The relevant dimensional requirements for buried pipes are also referred to GB13663 for PE water supply pipes. Buried pipes are generally in coil form and the length is determined by engineering design requirements.

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