Model-based prototype design, establishment and operation of ventilation system for underground gymnasium

Area of Science:

• Engineering
• Environmental Science
• Building Science

Background:

• Underground small indoor gymnasiums (USIG) require efficient ventilation for maintaining optimal temperature and gas concentrations.
• Developing economical and effective closed-loop ventilation systems is crucial for these public spaces.

Purpose of the Study:

• To design, establish, and operate a model-based prototype for a closed-loop underground small indoor gymnasiums' ventilation system (USIGVS).
• To achieve effective regulation of temperature and gas concentrations (O2 and CO2) within USIGs.

Main Methods:

• Developed an extended Multiphysics model integrating air flow, temperature, and gas concentrations with a PID controller.
• Formulated a cost function to represent design requirements and applied Global Parameter Sensitivity Analysis (GPSA) for parameter ranking.
• Determined optimal parameters through GPSA and response optimization for the ventilation system.

Main Results:

• GPSA identified proportional gain (kp), derivative gain (kd), and inlet distance (r) as the most influential parameters.
• Optimal parameters were determined for PID controller gains and geometric dimensions (kp=3.17, kd=1.49, r=2.04m, d=3.12m, ki=0.37, h=3.85m).
• Real-time simulation and operation confirmed robust maintenance of temperature and gas levels with dynamic response and lower power consumption.

Conclusions:

• The model-based prototype and optimal parameter tuning successfully established a closed-loop USIGVS.
• The system effectively meets design requirements for temperature and gas concentration control in underground gymnasiums.
• The developed ventilation system demonstrates efficiency, robustness, and reduced energy consumption.