摘要：The earth-air heat exchanger (EAHE) play an important role in building energy efficiency. Most of the previous studies have adopted numerical simulation and experimental methods, and Theoretical research was rarely used. The theoretical analysis method has clear mathematical physical meaning. Due to the few theoretical analysis methods used, there were no general criteria for the value of heat-regulating zone. The inaccurate value of the heat regulating zone will cause calculation errors or waste unnecessary computing resources. In this research, the calculation formula of the unsteady temperature field of the EAHE was derived and the calculation correlation of value of the heat regulating zone was also given. The results show that the derived calculation formula of the unsteady the dimensionless airflow of EAHE is in good agreement with the experiment, and calculation correlation of the value of the heat regulating zone is suitable for various engineering. This research provides a theoretical basis for the design and application of tunnel ventilation and a correlation formula for the value of the heat regulating zone.
