## 3 Experiments and Analysis of Results  
### Experiment Conditions and Procedure  
The overall size of the laboratory was 10 m \(\times\) 9 m, and the indoor office could accommodate 39 people simultaneously. The personnel activity space was divided into two cabinet air conditioning units with model KFR-72 LW/DY-PA400(D2)A, a cooling capacity of 7290 W, and rated power of 2190 W installed. The experimental environment is shown in Figure 4.  
To better meet the specific requirements of thermal comfort, we took a series of measures in the experimental design to avoid unnecessary influencing factors. Among them, we paid special attention to the individual differences of the subjects including age, height, body size, gender, and living habits. Considering those factors may produce errors in the prediction results, we selected 16 graduate students from Xi'an University of Architecture and Technology as our experimental subjects, which can further enhance the representativeness of the experimental data. These postgraduates had lived in Xi'an for more than one year, their lifestyle patterns were similar, and their body mass indexes ranged from 17.2 to 26.3, within the normal range of the Chinese reference standard. The subjects' basic information is shown in Table 1. Through these parameters, we can more accurately assess thermal comfort and improve the reliability and validity of the experimental data. Figure 4: Experimental environment. The experimental data were collected on 10 November 2022, and 11 November 2022. The subjects' clothing was long-sleeved and long pants. The sensitivity of all experimental apparatus was checked and calibrated before the experiment to achieve accurate measurements of indoor environmental parameters. Measurement points were based on the requirements of the Evaluation Standard for Indoor Thermal and Humid Environment in Civil Building [31], and the temperature and humidity sensors were placed at 1 m from the ground to prevent large errors between the parameters of the subject's environment and those obtained from the measurements. The details of the experimental devices are shown in Table 2.  
Each experiment started at 9:00, ended at 16:30, and lasted six and a half hours. During the whole experiment, the subjects were kept in daily working and studying conditions in the room. The air conditioning temperature was adjusted at intervals of 1 \({}^{\circ}\)C, and the adjustment range was 16-30 \({}^{\circ}\)C. After each adjustment of the air conditioning temperature, the indoor current air temperature and humidity were recorded at a fixed position with a temperature and humidity recorder. The air conditioning temperature was adjusted once in a cycle of 25 min. Each process was divided into three phases: personnel adaptation, observation of personnel thermal discomfort body language expression, and the thermal comfort feedback collection. The experimental procedure is shown in Figure 5.  
Personnel adaptation: the initial indoor air conditioning temperature was set at 16 \({}^{\circ}\)C, and the subjects first underwent 5 min of environmental adaptation. \begin{table}
\begin{tabular}{c c c c c c} \hline
**Gender** & **Quantity** & **Age** & **Height/m** & **Weight/kg** & **BMI/kg-m2** \\ \hline Male & 8 & 25.0 \(\pm\) 1.0 & 1.75 \(\pm\) 0.1 & 68.5 \(\pm\) 11.5 & 22.5 \(\pm\) 3.8 \\ Female & 8 & 24.9 \(\pm\) 2.2 & 1.60 \(\pm\) 0.1 & 49.9 \(\pm\) 14.0 & 19.3 \(\pm\) 2.1 \\ \hline \end{tabular}
\end{table} 
Table 1: Subjects’ basic information table. Figure 5: Experimental procedure. Observation of thermal discomfort body language expression: Due to inter-individual differences, existing studies provide small datasets of thermal discomfort body language, which cannot predict thermal comfort and thermal dissatisfaction rate comprehensively and accurately.