An Investigation on the Dynamic Response Property in an Underground Tunnel Space with Constant Temperature

The cutting-edge scientific research calls for the emergence of some special high-precision thermostatic chambers, which are characteristic of large space and many internal and external disturbances. These chambers mainly function by chilled water taking away most of the heat generated by the internal heat source and adjusting the air supply by air conditioners to ensure the constant temperature accuracy of the laboratory room. In order to improve this, the paper employs the numerical simulation method to study the temperature response characteristics of airflow organization under different air supply modes and the dynamic response characteristics of different air supply temperatures to constant-temperature region. The research finds the optimal airflow distribution pattern and the location of the optimal control point, which provides the reliable foundation for the high-precision control solutions for underground constant-temperature space. The research results show that the air distribution under the lower air supply mode is more resistant to interference than that under the side air supply. The delay time coefficient and system time constant of the control point located in the middle of the constant-temperature zone and equal to the design temperature are smaller than the conventional control point of the air outlet central. Therefore, the control point equal to the design temperature can make the system react faster and the sensitivity is higher, which will help to make the high-precision control of the constant-temperature space.