The ATEHE system of the Belgian Sustainable Building Center under construction uses four concrete pipes with a pipe diameter of 60cm and a buried depth of about 2m. For this building's ATEHE system diagram. Research prospects The energy-saving characteristics of the ATEHE system using soil heat have been recognized by many scholars. However, there are still many problems to be solved on how to enhance the heat transfer of the underground buried pipe part and improve the energy utilization efficiency of the ATEHE system.
Through experiments, it is found that the condensation phenomenon is more serious in the middle section of the pipeline, and there is basically no condensed water at the beginning and end of the pipeline. Furthermore, through numerical calculation, it is found that the condensed water will adversely affect the heat transfer, but how much, how, and how The problem of eliminating condensate in time without affecting the air quality in the tube has yet to be resolved; on the other hand, the temperature of the fresh air in winter is still very low after preheating. How to make good use of this part of the fresh air, whether it is connected with the air conditioning system or directly It is more economical to eliminate the heat load of cold wind penetration indoors, which is still the main direction of future research.
In the long-term operation of the ATEHE system, the heat balance of the soil should also be considered, that is, the heat absorption in winter and the heat release in summer should be balanced to maintain the soil temperature at a constant value. After a period of operation, the system does not work at all due to changes in soil temperature. How to establish the soil heat balance equation and how to consider this problem comprehensively are also the focus of the study. In addition, this scheme has certain limitations in practical application. Because it needs to bury a longer horizontal duct, it cannot be applied to the city center and high-density residential areas and building groups; .
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