Preliminary Review of the Effects of Convective Cooling on Human Thermal Comfort and Performance
摘要
Convective cooling, generated by air movement, plays a crucial role in built environments. It could enhance occupants’ thermal comfort and has the potential to avoid deterioration of people’s performance (e.g., productivity, learning). It also contributes to reducing energy use for cooling. This cooling method can be integrated with a building’s heating, ventilation, and air conditioning (HVAC) system or it can function as an independent strategy. Optimal conditions for the occupant work performance remain unclear. Moreover, the non-uniform indoor environment caused by air movement may add to the uncertainty. In pursuit of energy savings and carbon neutrality, higher indoor temperature setpoints have been proposed with convective cooling. Although these measures may create an environment that most occupants find acceptable, their work performance may be reduced. This reduction may stem from warmer ambient temperatures and local discomfort, such as draft. Therefore, convective cooling requires careful consideration of factors like air speed, airflow direction, and the extent of occupant control. This review aimed to clarify the effects of convective cooling on occupants’ thermal comfort and work performance, examining the relevant airflow characteristics and directions. The results showed that convective cooling enhanced thermal comfort and improved certain tasks in indoor settings. Isothermal air movement was effective at temperatures up to about 30 °C, while non-isothermal strategies were effective up to 32 °C. Allowing users to adjust airflow often increased thermal comfort and performance.