Buried pipe backfilling method based on ground source heat pump system

Abstract

The invention discloses a buried pipe backfilling method based on a ground source heat pump system. In the wet season, when the underground water level is high, a water guide pipe and a limiting top cover are jacked upwards through water surface pressure of underground water, at the moment, the underground water flows into a transition box along the water guide pipe and a water passing hole, an underground drainage function is temporarily achieved, the situation that the water surface pressure of the underground water is too large and accordingly the backfilling layer of the ground source heatpump system is damaged is avoided, and the underground water entering the transition box can enter the backfilling soil layer through a partition plate and then penetrates through the backfilling soil layer due to the rising function of the underground water. In the dry season, when the underground water level is low, the water guide pipe and the limiting top cover firmly seal a drainage hole under the action of compression springs in a compressed state, heat exchanger between the underground water on the lower side of the transition box and the outside is reduced, and the heat preservation effect of the underground water is improved.

Description

Technical field [0001] The invention relates to the field of ground source heat pump systems, and more specifically, to a method for backfilling underground pipes based on the ground source heat pump system. Background technique [0002] Ground source heat pump is a device that transfers low-grade thermal energy to high-grade thermal energy by inputting a small amount of high-grade energy (such as electric energy) for terrestrial shallow energy. Generally, the ground source heat pump consumes 1kw / h of energy, and the user can get more than 4kw / h of heat or cooling. The ground source heat pump uses rock and soil, stratum soil, groundwater or surface water as the low-temperature heat source, and the water-to-ground heat pump unit , The heating central air-conditioning system composed of the geothermal energy exchange system and the building system. According to the different forms of geothermal energy exchange systems, ground source heat pump systems are divided into buried pipe g...

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Problems solved by technology

[0004] In areas with abundant rainfall, groundwater is often widely distributed, so the groundwater ground source heat pump system using groundwater is a good choice for users in these areas. In the groundwater ground source heat pump system, heat exchange pipes need to be buried in advance, and in order to ensure that groundwater and The temperature difference of the surface temperature is usually backfilled with sand and other backfill materials or other special grouting backfill materials. The denser the backfill, the better. In many areas, precipitation usually has a strong seasonality. During the wet season, abundant Rainwater will cause the groundwater level to skyrocket. If the place where the heat exchange tube is buried is deep, the rising groundwater will easily erode the backfill layer, affecting the thermal insulation effect of the backfill layer, and further affecting the heat utilization efficiency of the groundwater ground source heat pump system. When the heat exchange tube When the buried place is relatively shallow, the groundwater level will drop during the dry season, which will easily cause the heat exchange pipe to leak out of the groundwater surface, affecting the heat exchange between the two, making the groundwater ground source heat pump system have a seasonal tendency, affecting the groundwater level. Benefits of source heat pump systems

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