TY - JOUR
TI - Numerical simulation of temperature field around buried pipes of ground source heat pumps based on mathematical models
AU - Zhu Huiyuan
JN - Thermal Science
PY - 2024
VL - 28
IS - 2
SP - 1441
EP - 1448
PT - Article
AB - The author established a physical and mathematical model for the heat  exchange of a ground source heat pump buried heat exchanger under the  co-operation of heat and seepage, including the soil and fluid inside the  pipe surrounding the heat exchanger. Using ANSYS finite element APDL  language for programming, based on the line heat source model, simulate the  temperature field around the vertical double U-tube underground heat  exchanger, the effects of soil thermophysical properties, temperature  outside the pipe, soil type and backfill material on soil temperature field  were obtained through simulation analysis. The experimental results indicate  that, the changes in soil temperature are also significant with different  backfill materials. Therefore, it is necessary to conduct serious research  and optimization on backfill materials, develop new types of backfill  materials, improve backfill construction techniques, and conduct in-depth  research by combining theoretical analysis with practical engineering to  ultimately find efficient and economical backfill materials. The change in  equivalent pipe diameter has little effect on soil temperature, and the  linear heat source model is used for calculation without causing significant  errors. It has been proven that the soil itself has strong resilience and  has reference value for the design of buried heat exchangers in practical  engineering.