An Investigation into the Dynamics of the Thermal Environment of Split Air-conditioned Buildings in Summer

The indoor thermal environment is crucial for human thermal comfort. This study focuses on the dynamic changes of the thermal environment of split air conditioners in summer, analyzes their main influencing factors, and compares them with domestic and international thermal comfort standards. The results show that: during the air conditioning on phase, the indoor temperature decreases rapidly and then slowly, the wind speed fluctuates within a certain range, and the relative humidity decreases, forming a coupled environment of wind speed and temperature slope; during the off phase, the temperature rises rapidly and then slowly, and the wind speed exhibits a drifting characteristic. Existing thermal comfort standards mostly focus on air temperature changes, ignoring the coupling effect of multiple factors such as wind speed. This study provides an important theoretical basis and practical reference for optimizing the thermal comfort standard, guiding the actual air conditioning usage pattern and improving the quality of indoor thermal environment.